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Electronic groupsets in China

Road, gravel, MTB and TT electronic shifting compared in one place.

13 systems · reviewed 2026-08-25 Open a row for fit, batteries, package scope, weight evidence and sources.

Electronic groupsets available in China
SystemUseGearingSetupChina price
Shimano 105 Di2 R7150 rear derailleur105 Di2 R7170Shimano
 Road / all-roadThe default value benchmark: mature parts supply, 36T cassette capacity and an HG-compatible road ecosystem. 2x · 12Up to 36T rear Semi-wirelessHydraulic disc ¥4,150–4,200Dealer observations · 2026-08-20
Details

Road and all-road 2x12 electronic shifting with hydraulic disc brakes

Fit

Freehub
HG road for the supported 11T-start cassettes
Hanger
Standard/direct-mount compatible derailleur-hanger system
Frame
Internal BT-DN300 space and two SD300 wire routes to FD/RD
Brake fluid
Shimano mineral oil

Power & controls

Architecture
Semi-wireless: the levers transmit wirelessly; front and rear derailleurs connect to one internal BT-DN300 battery.
Battery
Internal BT-DN300 derailleur battery; wireless levers use coin cells.
Controls
E-TUBE PROJECT Cyclist supports firmware, adjustment and control configuration.

Package & weight

Package
A large-set label is not normalized. The dated ¥4,150 and ¥4,200 observations say large package without rotors; a separate ¥3,570 observation covers electronic parts plus calipers.
Weight
No package-independent total is used. Dealer options vary in whether crank, cassette, chain, calipers, rotors and bottom bracket are present.

Captured packages

Dealer market observation · ¥4,150mainland public dealer-post synthesis · 2026-08-19 · Dealer market observation

Large package, described without rotors; underlying dealer-post URL was not supplied.

Dealer market observation · ¥4,200mainland public dealer-post synthesis · 2026-08-20 · Dealer market observation

Separate large-package observation; exact contents beyond the supplied wording remain unverified.

Dealer market observation · ¥3,570mainland public dealer-post synthesis · 2026-08-24 · Dealer market observation

Electronic parts plus calipers; not a normalized full groupset.

Confirm before buying

  • Confirm every included part; small, medium and large package names are seller text, not standards.
  • The frame needs internal battery space and wire routing even though the levers are wireless.
  • Compare the complete installed cost, including rotors, bottom bracket and any omitted drivetrain parts.
SourcesShimano 105 Di2 RD-R7150Shimano Product Information RD-R7150Shimano Di2 with BT-DN300 compatibilityShimano August price-rise and dealer-market observation synthesisElectronic groupsets to buy in China — August 2026Image: Shimano · exact family
Shimano GRX RX825 Di2 rear derailleurGRX Di2 RX825Shimano
 Gravel / all-roadThe strongest 2x benchmark for broken roads and gravel: close road-like steps, 36T range and SHADOW RD+ chain control. 2x · 12Up to 36T rear Semi-wirelessHydraulic disc
Details

Road-biased gravel and all-road 2x12 with a chain stabilizer

Fit

Freehub
HG for 11-34T or 11-36T 12-speed cassettes
Hanger
Standard/direct-mount compatible derailleur-hanger system
Frame
Internal BT-DN300 space, FD mount and two SD300 wire routes
Brake fluid
Shimano mineral oil

Power & controls

Architecture
Semi-wireless: wireless levers with front and rear derailleurs wired to an internal BT-DN300 battery.
Battery
Internal BT-DN300 derailleur battery; wireless lever controls.
Controls
E-TUBE PROJECT Cyclist plus full or semi-synchronized shift modes; rear derailleur includes SHADOW RD+ stabilization.

Package & weight

Package
Core electronic purchases need two levers, FD, RD, BT-DN300, SD300 wires, charger and hydraulic brakes; crank, cassette, chain, rotors and bottom bracket may be separate.
Weight
No normalized complete-groupset total is recorded; compare only like-for-like component packages.

Confirm before buying

  • This is 2x only; do not merge its battery, cassette or derailleur facts with RX717/RX827 1x.
  • Confirm whether the chosen crank is 46/30 or 48/31 and whether the cassette is 11-34 or 11-36.
  • A retrofit still needs internal battery and wire routing.
SourcesShimano GRX Di2 RD-RX825Shimano Product Information RD-RX825Shimano Di2 with BT-DN300 compatibilityElectronic groupsets to buy in China — August 2026Image: Shimano · exact family
Shimano GRX RX827 wireless rear derailleurGRX Di2 RX717 / RX827Shimano
 GravelWide-range wireless gravel: RX717 is the value version and RX827 the tougher premium version, both distinct from wired 2x RX825. 1x · 12Up to 51T rear Fully wirelessHydraulic disc
Details

Fully wireless 1x12 gravel with a 10-51T cassette

Fit

Freehub
Micro Spline for the 10-51T cassette
Hanger
Conventional replaceable hanger; UDH is not required
Frame
No internal electronic wire route; verify normal hanger clearance and 1x chainline
Brake fluid
Shimano mineral oil

Power & controls

Architecture
Fully wireless shifting with a removable protected battery in the rear derailleur; no internal derailleur battery wiring.
Battery
Removable rear-derailleur battery shared across the current RX717/RX827-compatible Shimano wireless family; lever controls use their own cells.
Controls
Wireless Di2 control; Automatic Impact Recovery and SHADOW ES-style protection are part of the current rear-derailleur family.

Package & weight

Package
A usable conversion needs the matching right shift/brake lever, left brake lever, RD battery and charger, 10-51T cassette, chain, crank/chainring and hydraulic brakes.
Weight
No normalized package total is recorded; RX717 and RX827 component weights must remain revision-specific.

Confirm before buying

  • The 10T start requires a Micro Spline-compatible wheel or freehub body.
  • This is 1x only and has larger cadence steps than a 2x road/all-road setup.
  • Do not label the normal-hanger RX827 as SRAM-style UDH Full Mount.
SourcesShimano expands GRX with RX717Shimano GRX Di2 RD-RX827-SGSShimano Product Information RD-RX827-SGSElectronic groupsets to buy in China — August 2026Image: Shimano · GRX RX827 shown
SRAM Rival AXS E1 wireless rear derailleurRival AXS E1SRAM
 Road / all-roadThe mainstream fully wireless benchmark: easy electronic installation, but XDR, Flattop, DUB and DOT requirements can raise retrofit cost. 1x or 2x · 12Up to 36T rear Fully wirelessHydraulic disc
Details

Fully wireless road/all-road 1x or 2x12

Fit

Freehub
XDR for the normal 10T-start road cassettes
Hanger
Standard derailleur hanger
Frame
No electronic wire route; verify XDR wheel and DUB/crank compatibility
Brake fluid
DOT 5.1

Power & controls

Architecture
Fully wireless AXS control with removable batteries on each derailleur and coin cells in the levers.
Battery
One removable AXS battery per installed derailleur plus lever coin cells; a 2x setup normally carries two interchangeable derailleur batteries.
Controls
AXS app supports setup, personalization, battery state and firmware.

Package & weight

Package
A road conversion may need levers, RD, optional FD, one or two batteries, charger, calipers, cassette, Flattop chain, crank, DUB bottom bracket and rotors.
Weight
SRAM states the current family is 213 g lighter than its prior generation, but no cross-brand package total is used here.

Confirm before buying

  • Count the XDR freehub, Flattop chain, cassette, batteries, charger, DUB parts and DOT bleed equipment before comparing prices.
  • Road AXS hydraulic brakes use DOT fluid, not mineral oil.
  • Confirm whether a listing is E1 current generation or older Rival eTap AXS.
SourcesSRAM Rival AXS E1 rear derailleurElectronic groupsets to buy in China — August 2026Image: SRAM · exact family
SRAM Apex XPLR AXS D1 wireless rear derailleurApex XPLR D1 / Rival XPLR E1SRAM
 GravelApex D1 is the standard-hanger 12-speed route; Rival E1 is the newer 13-speed Full Mount route and requires a UDH-capable frame. 1x · Apex 12; Rival 13Up to 46T rear Fully wirelessHydraulic disc
Details

Fully wireless 1x gravel, with different 12- and 13-speed frame constraints

Fit

Freehub
Apex: HG with 11-44T or XDR with 10T-start cassette; Rival E1: XDR
Hanger
Apex D1 standard hanger; Rival E1 requires UDH-capable Full Mount frame
Frame
Rival E1 cannot be fitted to an ordinary non-UDH dropout
Brake fluid
DOT 5.1

Power & controls

Architecture
Fully wireless AXS control with a removable rear-derailleur battery; the two revisions use different cassettes and frame mounts.
Battery
Removable AXS rear-derailleur battery plus lever coin cells.
Controls
AXS app supports setup, personalization, battery state and firmware.

Package & weight

Package
Apex D1 works with 10-36T, 10-44T or 11-44T XPLR cassettes; the 11-44T route can retain HG. Rival E1 uses the 10-46T 13-speed XPLR cassette and Full Mount.
Weight
No combined total is used because Apex D1 12-speed and Rival E1 13-speed are different systems.

Confirm before buying

  • Never present 13-speed Rival XPLR E1 as compatible with an ordinary hanger frame.
  • Do not merge Apex D1 12-speed cassette compatibility into Rival E1 13-speed.
  • Count XDR, Flattop chain, batteries, brakes and installation parts in the conversion price.
SourcesSRAM Apex XPLR AXS D1 rear derailleurSRAM Rival XPLR AXS E1 compatibilityElectronic groupsets to buy in China — August 2026Image: SRAM · Apex XPLR AXS D1 shown
WheelTop EDS TX electronic road shift leversEDS TX road electronicWheelTop · Wheeltop
 RoadThe broad-compatibility option: app-selectable cassette speed and a rim/cable-brake kit as well as hydraulic disc. 1× or 2× · 3-14Up to 36T rear Fully wirelessHydraulic disc · Cable-actuated rim or mechanical disc ¥2,369–3,219Taobao options · 2026-08-24
Details

Road 1× or 2× electronic shifting with hydraulic or cable brakes

Fit

Freehub
Depends on the selected 3-14-speed cassette; verify cassette, chain and wheel together
Hanger
Standard derailleur hanger
Frame
No internal battery or electronic wire route; verify front-derailleur mount for 2x
Brake fluid
Confirm the selected hydraulic revision; cable-brake kit has no hydraulic circuit

Power & controls

Architecture
Fully wireless control with separate rechargeable batteries in the front and rear derailleurs; shifters use CR2032 cells.
Battery
Rear derailleur 800 mAh, front derailleur 500 mAh, claimed 20,000+ shifts and 800 charge cycles; shifters use CR2032. RD/FD are IP67 and shifters IP65.
Controls
App sets cassette speed, button mapping, micro-adjustment, calibration, firmware and battery display; ANT+ integration is advertised.

Package & weight

Package
The official hydraulic kit includes two levers, front and rear derailleurs, two calipers and hoses, charging parts, instructions and spares. The observed Taobao options separate 1x/2x and alloy/carbon seller labels; crank, cassette, chain, rotors and bottom bracket were not visible as included. Cable kit omits calipers and hoses, and its lever internals are not interchangeable.
Weight
Hydraulic kit listings: 223 g per lever, 336 g rear derailleur, 191 g front derailleur and 163 g per caliper. Hoses, charging parts and small hardware are additional.

Captured packages

单盘碟刹铝合金版 · ¥2,369Taobao seller option · 2026-08-24 · Listed option

单盘碟刹铝合金版; 1x hydraulic-disc shift-and-brake kit, alloy seller label; checkout unverified; crank, cassette, chain, rotors and bottom bracket not visible as included.

单盘碟刹碳纤维版 · ¥2,624Taobao seller option · 2026-08-24 · Listed option

单盘碟刹碳纤维版; 1x hydraulic-disc shift-and-brake kit, carbon-fibre seller label; checkout unverified.

碟刹铝合金版 · ¥2,879Taobao seller option · 2026-08-24 · Listed option

碟刹铝合金版; 2x hydraulic-disc shift-and-brake kit, alloy seller label; checkout unverified.

碟刹碳纤维版 · ¥3,219Taobao seller option · 2026-08-24 · Listed option

碟刹碳纤维版; 2x hydraulic-disc shift-and-brake kit, carbon-fibre seller label; checkout unverified.

Displayed reference · EUR 659manufacturer-direct global store · 2026-08-24 · Displayed reference

Displayed reference on the official page; variation, destination, tax, shipping and mainland warranty route were not checked.

Confirm before buying

  • Keep the current 3-14-speed revision separate from older regional 7-13-speed TX records.
  • Select the exact cassette speed in the app and verify chain/cassette compatibility rather than treating 3-14-speed support as universal indexing proof.
  • The 36T rear limit is narrower than many modern gravel 1× cassettes.
  • Do not subtract the screenshot's unspecified ¥300 combination discount from any selected-option price.
  • Confirm brake version, hose length, pad/rotor compatibility and local after-sales route.
SourcesWheelTop EDS TX road electronic groupsetWHEELTOP EDS TX Taobao option pricesImage: WheelTop · exact family
WheelTop EDS GeX wireless gravel rear derailleurEDS GeX gravel electronicWheelTop · Wheeltop
 GravelThe Chinese wide-range wireless option: choose derailleur cage and hanger configuration before treating it as one product. 1x · 3-14Up to 52T rear Fully wirelessHydraulic disc ¥2,369Taobao options · 2026-08-24
Details

Fully wireless 1x gravel with 46T or 52T rear range

Fit

Freehub
Depends on the selected 3-14-speed cassette; verify cassette, chain and wheel together
Hanger
Standard-hanger and UDH-specific configurations exist; order the exact one
Frame
No internal electronic wire route; verify cage clearance and selected hanger version
Brake fluid
Mineral oil

Power & controls

Architecture
Fully wireless control with an integrated rechargeable rear-derailleur battery and wireless levers.
Battery
Rear derailleur 800 mAh; current materials describe about 20,000 shifts and 800 charge cycles.
Controls
App speed selection and fine adjustment plus ANT+ support.

Package & weight

Package
Current packages combine rear derailleur, two levers, hydraulic calipers/hoses and charging cable. The observed Taobao long-, medium- and short-cage seller options were each ¥2,369, but their screenshots do not map those labels to exact 46T/52T capacities; confirm cage, lever material and standard-hanger or UDH configuration.
Weight
Do not carry the older 7-13-speed RA-package 1.14 kg figure into the current 3-14-speed revision without an exact package match.

Captured packages

碟刹长腿版 · ¥2,369Taobao seller option · 2026-08-24 · Listed option

碟刹长腿版; 1x hydraulic shift-and-brake kit, long-cage seller label; exact sprocket capacity not established by screenshot; checkout unverified.

碟刹中腿版 · ¥2,369Taobao seller option · 2026-08-24 · Listed option

碟刹中腿版; 1x hydraulic shift-and-brake kit, medium-cage seller label; exact sprocket capacity not established by screenshot; checkout unverified.

碟刹短腿版 · ¥2,369Taobao seller option · 2026-08-24 · Listed option

碟刹短腿版; 1x hydraulic shift-and-brake kit, short-cage seller label; exact sprocket capacity not established by screenshot; checkout unverified.

Confirm before buying

  • Keep the current 3-14-speed revision separate from older 7-13-speed RA records.
  • A 75 mm 46T unit and 93 mm 52T unit are not interchangeable specifications.
  • Do not infer 46T or 52T capacity from the Taobao long/medium/short seller labels alone, and do not apply the unspecified ¥300 bundle discount.
  • Confirm cassette indexing, chain, hanger configuration, lever material and warranty route.
SourcesWheelTop EDS GeX wireless gravel groupsetElectronic groupsets to buy in China — August 2026WHEELTOP EDS GeX Taobao option pricesImage: WheelTop · exact family
L-TWOO eRX electronic road shift levers on a handlebareRX / eR9 road electronicL-TWOO · 蓝图
 RoadeRX is the carbon flagship; eR9 is the lower-cost aluminium entry system with separate calipers. 2× · 10-12 Semi-wirelessHydraulic disc ¥3,480Taobao option · 2026-08-24
Details

Road 2× electronic shifting with hydraulic disc brakes

Fit

Freehub
Depends on the selected 10-12-speed cassette
Hanger
Standard derailleur hanger
Frame
Internal seat-tube battery fit and two power-wire routes
Brake fluid
L-TWOO O ONE mineral brake fluid; do not substitute DOT

Power & controls

Architecture
Semi-wireless: both levers send wireless commands; front and rear derailleurs draw power through wires from one seat-tube battery.
Battery
Official manual/catalog generation: internal 7.4 V, 800 mAh battery; current range and charge time are not stated on the current product overview.
Controls
L-TWOO app supports speed selection, micro-adjustment and firmware updates; optional flat-bar and time-trial controls are part of the Electric ecosystem.

Package & weight

Package
The official manual package includes two levers, front and rear derailleurs, two hydraulic calipers, internal battery, two power wires, charger, hardware and mineral brake fluid. The observed boxed eR9 kit was ¥3,480; the same visible core parts total ¥3,973 as separate options, while crank, cassette, chain, rotors and bottom bracket were not visible as included.
Weight
The official 2024 catalog lists 225 g per lever, 270 g rear derailleur, 135 g front derailleur and 118 g per caliper. It does not give a safe current-generation total.

Captured packages

eR9 盒装铝合金版套件 · ¥3,480Taobao seller option · 2026-08-24 · Listed option

eR9 盒装铝合金版套件; boxed 2x road shift-and-brake kit, alloy seller label; checkout unverified; crank, cassette, chain, rotors and bottom bracket not visible as included.

eR9 左手2速 · ¥688Taobao seller option · 2026-08-24 · Component option

eR9 左手2速; left 2-speed lever.

eR9 右手10-12速 · ¥688Taobao seller option · 2026-08-24 · Component option

eR9 右手10-12速; right 10-12-speed lever.

eR9 前拨 直装式 · ¥520Taobao seller option · 2026-08-24 · Component option

eR9 前拨 直装式; braze-on front derailleur.

eR9 后拨 · ¥780Taobao seller option · 2026-08-24 · Component option

eR9 后拨; rear derailleur.

eR9 前夹器（含油管） · ¥319Taobao seller option · 2026-08-24 · Component option

eR9 前夹器（含油管）; front caliper with hose.

eR9 后夹器（含油管） · ¥319Taobao seller option · 2026-08-24 · Component option

eR9 后夹器（含油管）; rear caliper with hose.

磁吸充电器+电源线X2+电池组 · ¥659Taobao seller option · 2026-08-24 · Component option

磁吸充电器+电源线X2+电池组; magnetic charger, two power cables and battery pack.

磁吸充电器 · ¥119Taobao seller option · 2026-08-24 · Component option

磁吸充电器; magnetic charger only.

Confirm before buying

  • Confirm the exact generation, maximum rear sprocket, rear-cage range and battery-mount fit before ordering.
  • The system requires internal power-wire routing and a workable seat-tube battery mount.
  • Use the specified L-TWOO mineral brake fluid rather than DOT fluid.
SourcesL-TWOO road electronic shifting and hydraulic brake seriesL-TWOO 2024 product catalogL-TWOO eRX user manualL-TWOO eR9 Taobao kit and component pricesImage: L-TWOO · eRX shown
L-TWOO eGR electronic gravel groupset componentseGR gravel electronicL-TWOO · 蓝图
 GravelThe documented L-TWOO gravel option: 46T range, damped rear derailleur and hydraulic controls, but exact kit wiring and mainland package still need checking. 1x · 10-12Up to 46T rear ElectronicHydraulic disc
Details

Hydraulic 1x10-12-speed gravel shifting to 46T

Fit

Freehub
Depends on the chosen 10-12-speed 11-46T cassette
Hanger
Standard derailleur hanger
Frame
Confirm battery location, power-wire routing and 1x chainline for the exact generation
Brake fluid
L-TWOO O ONE mineral brake fluid; do not substitute DOT

Power & controls

Architecture
Electronic app-configurable shifting; confirm the exact battery and power-wire routing for the current package before ordering.
Battery
Current public product page does not expose a sufficiently clear package-level battery specification.
Controls
L-TWOO app supports speed selection, adjustment and firmware; rear derailleur includes a friction damping system.

Package & weight

Package
Confirm levers, rear derailleur, battery, wires/charger, both calipers and hoses; keep unverified OEM 13-speed fully wireless listings separate from this official 10-12-speed record.
Weight
Official current page lists 333 g for the damped rear derailleur and 225 g per shift/brake lever; it does not give a normalized full-package total.

Confirm before buying

  • Do not merge unverified OEM 13-speed fully wireless claims into the official 10-12-speed eGR record.
  • Confirm battery, wiring, caliper generation and every included item from the exact listing.
  • Use the specified L-TWOO mineral fluid and confirm local service support.
SourcesL-TWOO eGR gravel electronic shiftingL-TWOO disc brake and O ONE mineral-fluid guidanceElectronic groupsets to buy in China — August 2026Image: L-TWOO · exact family
Magene QED electronic groupset brake caliper and rotorQED / PES road electronicMagene · 迈金
 RoadQED is the lighter carbon-injection system and PES trades 100 g for lower-cost construction, but supplied 2026 service-action reports lack a matching official bulletin, so treat both as research-stage purchases. 2× · QED 10-13; PES 10-12Up to 34T rear Semi-wirelessHydraulic disc · Rim brake
Details

Road 2× semi-wireless electronic shifting in OEM core or full groupsets

Fit

Freehub
Depends on the chosen 10-13-speed cassette and exact QED/PES generation
Hanger
Standard derailleur hanger
Frame
Internal seatpost battery fit and power-wire routing
Brake fluid
Confirm the exact caliper generation and specified fluid

Power & controls

Architecture
Semi-wireless: levers communicate wirelessly; front and rear derailleurs connect to one internal seatpost battery.
Battery
7.4 V 800 mAh seatpost battery, claimed 2,500 km derailleur range, 3-hour charge and 18-month shifter-battery life.
Controls
App setup, synchronized shifting, three configurable X/Y/Z buttons, multi-scenario setup and bike-computer/light integration are listed.

Package & weight

Package
Core rim-brake kit covers levers and derailleurs; core disc kit adds brakes. Full and super OEM groupsets may add cassette, chain, crank or power-meter crank, and some packages add wheels.
Weight
Official catalog: QED disc-brake core groupset 1,150 g; PES disc-brake core groupset 1,250 g. Core means levers, derailleurs and brakes, not cassette, chain or crank.

Confirm before buying

  • Public 2026 service-action and free-upgrade reports were supplied without a matching official bulletin; confirm the revised generation and written warranty before purchase.
  • Magene's direct platform lists a one-year warranty for the original purchaser; purchases through other official channels follow that channel's policy.
  • Confirm whether a listing is a core kit or a full OEM package; cassette, chain and crank are absent from core groupsets.
  • The 2024 launch material described 10-12-speed compatibility, while the newer catalog lists QED through 13 speed; confirm firmware and exact generation.
  • Confirm internal battery fit, wire routing, brake-caliper version and an after-sales route for the exact seller or complete bike.
SourcesMagene all-products catalog — QED and PES electronic shiftingMagene QED electronic shifting system overviewMagene direct-platform warranty policyImage: Magene · QED shown
Ultegra R8170 / Dura-Ace R9270 Di2Shimano
 RoadPremium road benchmarks with lower component weight and additional control features, but no cassette-range advantage over 105 R7170. 2x · 12Up to 34T rear Semi-wirelessHydraulic disc · Wired rim-brake controls ¥6,050Dealer observation · 2026-08-20
Details

Premium road 2x12 electronic shifting with hydraulic-disc or generation-specific wired rim-brake controls

Fit

Freehub
HG road for supported 11T-start 12-speed cassettes
Hanger
Standard/direct-mount compatible derailleur-hanger system
Frame
Internal BT-DN300 space and SD300 wire routes to both derailleurs; rim-brake controls require their generation-specific wiring
Brake fluid
Shimano mineral oil for hydraulic-disc builds

Power & controls

Architecture
Semi-wireless in the hydraulic-disc builds: wireless levers with front and rear derailleurs connected to one internal BT-DN300 battery; current rim-brake controls are wired.
Battery
Internal BT-DN300 derailleur battery; hydraulic wireless levers use coin cells.
Controls
E-TUBE PROJECT Cyclist supports firmware, adjustment and control configuration; these tiers add control and component refinements rather than cassette range.

Package & weight

Package
The dated R8170 ¥6,050 observation was described as a large package including rotors; a separate ¥5,000 observation covers electronic parts plus calipers. Neither is a normalized checkout package.
Weight
No package-independent total is used; quoted totals must identify whether crank, cassette, chain, calipers, rotors and bottom bracket are included.

Captured packages

Dealer market observation · ¥6,050mainland public dealer-post synthesis · 2026-08-20 · Dealer market observation

R8170 large package, reported with rotors; underlying dealer checkout was not captured.

Dealer market observation · ¥5,000mainland public dealer-post synthesis · 2026-08-24 · Dealer market observation

R8170 electronic parts plus calipers; not a normalized full groupset.

Confirm before buying

  • Both rear derailleurs stop at 34T; 105 R7170 supports 36T.
  • Confirm hydraulic-disc versus wired rim-brake controls and every included part.
  • Treat the observed R8170 premium as a planning lead, not a guaranteed Taobao checkout difference.
SourcesShimano Ultegra Di2 RD-R8150 rear derailleurShimano Dura-Ace Di2 RD-R9250 rear derailleurShimano Di2 with BT-DN300 compatibilityShimano August price-rise and dealer-market observation synthesisElectronic groupsets to buy in China — August 2026
L-TWOO eRX-TTTime trial / triathlon
 Time trial / triathlonTT brake levers with shift buttons and separate aero-extension controllers, not ordinary drop-bar road controls. ¥4,196.1–4,796.1Taobao options · 2026-08-24
Details

Captured packages

新款eRX-TT碳纤维大导轮电子变速套装 · ¥4,796Shift brake · 2026-08-24

carbon-fibre and large-pulley full TT kit

新款eRX-TT电子变速套装 · ¥4,596Shift brake · 2026-08-24

standard full TT kit

eRX-TT 电子部分-不含夹器-大导轮... · ¥4,396Electronics only · 2026-08-24

large-pulley electronic parts excluding calipers; label ending hidden

eRX-TT 电子部分-不含夹器 · ¥4,196Electronics only · 2026-08-24

standard electronic parts excluding calipers

eRX-TT左刹把（带变速按钮） · ¥697Component · 2026-08-24

left brake lever with shift button

eRX-TT右刹把（带变速按钮） · ¥697Component · 2026-08-24

right brake lever with shift button

eRX-TT刹把一对（带变速按钮） · ¥1,327Component · 2026-08-24

pair of brake levers with shift buttons

eRX-TT左控制器 · ¥442Component · 2026-08-24

left aero-extension controller

eRX-TT右控制器 · ¥442Component · 2026-08-24

right aero-extension controller

eRX-TT控制器一对 · ¥842Component · 2026-08-24

pair of aero-extension controllers

Package boundary

TT brake levers with shift buttons and separate aero-extension controllers, not ordinary drop-bar road controls.

Option-level screenshot prices, not checkout totals. The selected carbon/large-pulley full kit showed ¥4,796.10 after a ¥2.90 coupon reduction from ¥4,799. The repeated ¥400 difference between electronics-only and full-kit options suggests the caliper pair, but that bill of materials remains to be confirmed. Eight unseen options are not inferred. No public listing URL or private buyer data is retained.

SourceL-TWOO eRX-TT Taobao kit and control prices
SRAM GX AXS / Eagle TransmissionMTB
 MTBMTB controller and drivetrain packages; no drop-bar brake levers or road hydraulic calipers. ¥2,950–5,500Taobao options · 2026-08-24
Details

Captured packages

24款GX 电变指拨+后拨 不含电池充电器 · ¥2,950Electronics only · 2026-08-24

controller and rear derailleur; battery and charger excluded

24款GX电子部分 指拨+后拨+充+电池 · ¥3,340Electronics only · 2026-08-24

controller, rear derailleur, charger and battery

24款GX小套（指拨+后拨+链+飞+充...） · ¥4,550Partial groupset · 2026-08-24

controller, rear derailleur, chain, cassette and charging items; label ending hidden

24款GX宽版中套【带1个护盘】牙盘... · ¥5,450Partial groupset · 2026-08-24

wide medium kit with one guard; remaining dimensions hidden

24款GX宽版中套【带护盘】牙盘32T165 送中轴 · ¥5,500Partial groupset · 2026-08-24

guarded wide medium kit, 32T, 165 mm crank, bottom bracket shown as gift

Package boundary

MTB controller and drivetrain packages; no drop-bar brake levers or road hydraulic calipers.

Option-level screenshot prices, not checkout totals. Only five materially distinct readable options are recorded; five additional ¥5,500 crank rows and twenty unseen options remain unverified. The ¥5,500 package appears to include crank, cassette and chain, so it is not comparable with road shift-and-brake kits. No public listing URL or private buyer data is retained.

SourceSRAM GX AXS / Eagle Transmission Taobao option prices
How package labels and prices are normalized
Shift-only
Levers, derailleurs, battery, wires and charger.
Shift-brake
Shift-only plus calipers and hoses.
Partial groupset
Shift-brake plus only some of crank, cassette, chain or rotors.
Full groupset
An exact, itemized list of every included component.
OEM take-off
Removed or split from a complete bike; retail packaging and warranty may be absent.

Seller labels such as 小套, 中套 and 大套 are retained as option text, never treated as standard packages. Taobao observations are option-level screenshots rather than verified checkout totals.