Chinese Bikes

Evidence reviewed through . Price records retain their own observation dates and conditions.View sourcesMethodology and dataset

SEKAComplete bikeResearch profile

SEKA SPEAR RDC

¥16,900China price · 2026-08-17
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Category
Aero road
Complete weight
7.1 kg
Bottom bracket
BSA threaded, 68 mm (frame standard; BB component inclusion in the custom build is not established)
Sizes
XS, S, M, L and XL, plus racing MR and LR
Tire clearance
32 mm

Overview

SEKA SPEAR RDC. A premium domestic aero platform with a claimed 685 g bare frame, threaded BSA bottom bracket and a separately documented 7.1 kg custom build.

The recorded complete-bike price is ¥16,900; its date and basis remain visible below.

Buying context

Before buying, verify Proof that the reported price maps to the complete listed build; Current mainland China exact-SKU checkout and stock; Frame weight in the owner's MR size; Full custom-bike BOM is not established by the official frameset package.

Specifications and evidence

Product type
Complete bike
Category
Aero road
Evidence maturity
Research profile
Price basis
China price · 2026-08-17
Drivetrain
Shimano Ultegra electronic; exact series unconfirmed
Complete weight
7.1 kg
Frame
Spear RDC frame in the owner's racing MR size. SEKA's weights are for size M: 685 g bare without paint or metal parts, and 729 g ±35 g in Shadow Black; the store prints 685 g ±35 g. MR is unpublished.
Frame material
TeXtreme base layers with DIALEAD pitch-based ultra-high-modulus and Pyrofil carbon, plus PMI foam filling
Frame construction
One-mould True-One-Piece frame; internal routing through SEKA's Rapier bar system
Bottom bracket
BSA threaded, 68 mm (frame standard; BB component inclusion in the custom build is not established)
Wheels
Voso Lite50 carbon
Cockpit
375×120 mm integrated handlebar on the custom build; official frameset uses the Rapier integrated bar
Sizes
XS, S, M, L and XL, plus racing MR and LR
Warranty
Current China policy: lifetime SEKA frameset, five years for SEKA carbon parts, two years for SEKA spare parts; non-SEKA complete-build parts are not covered by this statement.
Stiffness evidence
SEKA reports a 14.5% stiffness-to-weight improvement and 5% more stiffness than Exceed RDC, plus 109 N/mm vertical compliance; manufacturer comparisons with limited public protocol detail
Tire clearance
32 mm
Tire clearance basis
Official maximum actual tyre width, front and rear, on SEKA's current global and China pages; the 2024–25 catalog also lists 32c. A 35 mm tyre exceeds SEKA's stated limit.
Complete weight basis
Exact size-MR custom owner build with Shimano Ultegra electronic shifting and Voso Lite50 wheels: approximately 7.1 kg before pedals, bottle cages and computer mount; not a factory complete-bike SKU

Frame facts come from SEKA's official pages and catalog; this build's parts, 7.1 kg weight and ¥16,900 figure come from one owner report.

Other documented builds

These are separate configurations. Their weight, drivetrain, and price are not mixed into the catalog reference row.

Dealer RDC Ultegra Di2 build, DT Swiss ARC 1100 50Drivetrain: Shimano Ultegra Di2 R8170Price: ¥36,999 on 2026-10-24 — Dealer custom-build optionWheels: DT Swiss ARC 1100 50 mm

Same dealer standard-frame build ¥32,999; pre-order 15 days.

Price history

ObservedPriceTypeConditions
¥16,900Observed market recordowner-reported list price

Geometry

Official Spear chart for both RDC and Standard frames, identical on the current product page and in the 2024–25 catalog; millimetres and degrees.

Dimension names follow the letters on SEKA's drawing; inseam height is measured 50 mm ahead of the bottom bracket with a 680 mm tyre diameter.

Scroll horizontally to see every size. Keyboard: focus the table area and use the arrow keys.

Recorded geometry by size
DimensionXSSMMRLLRXL
Stack508524543538570560600
Reach362370379386389397402
Trail68625858585755
C1 seat tube449463480476508496535
RC chainstay410410410410410410410
H bottom-bracket drop74747272727272
FC front centre570574574578591585608
WB wheelbase9699739739789909951008
L head tube107120136130164153193
N top tube498514534540557563585
Q1 head angle70.671.772.9737373.173.5
Q7 seat angle7574.8747473.573.573
F fork offset48484444444444
G fork length372372372372372372372
Inseam height725738759753786774814
Recommended rider height (cm)150-163161-173170-180171-186177-187179-194185-198
Original geometry transcription
Geometry complete current manufacturer table
Official Spear chart for both RDC and Standard frames, identical on the current product page and in the 2024–25 catalog; millimetres and degrees. Printed size columns: XS / S / M / MR / L / LR / XL. Stack: 508 / 524 / 543 / 538 / 570 / 560 / 600; Reach: 362 / 370 / 379 / 386 / 389 / 397 / 402; Trail: 68 / 62 / 58 / 58 / 58 / 57 / 55; C1 seat tube: 449 / 463 / 480 / 476 / 508 / 496 / 535; RC chainstay: 410 / 410 / 410 / 410 / 410 / 410 / 410; H bottom-bracket drop: 74 / 74 / 72 / 72 / 72 / 72 / 72; FC front centre: 570 / 574 / 574 / 578 / 591 / 585 / 608; WB wheelbase: 969 / 973 / 973 / 978 / 990 / 995 / 1008; L head tube: 107 / 120 / 136 / 130 / 164 / 153 / 193; N top tube: 498 / 514 / 534 / 540 / 557 / 563 / 585; Q1 head angle: 70.6 / 71.7 / 72.9 / 73 / 73 / 73.1 / 73.5; Q7 seat angle: 75 / 74.8 / 74 / 74 / 73.5 / 73.5 / 73; F fork offset: 48 / 48 / 44 / 44 / 44 / 44 / 44; G fork length: 372 / 372 / 372 / 372 / 372 / 372 / 372; Inseam height: 725 / 738 / 759 / 753 / 786 / 774 / 814; Recommended rider height (cm): 150-163 / 161-173 / 170-180 / 171-186 / 177-187 / 179-194 / 185-198. Dimension names follow the letters on SEKA's drawing; inseam height is measured 50 mm ahead of the bottom bracket with a 680 mm tyre diameter.

About SEKA

Premium Chinese performance brand with sophisticated aero designs; public factory-ownership evidence is limited.

Visit the official SEKA website

Videos

Hands-on reviewPublication review

Seka Spear RDC Review - Mega Light Aero Bike?

Exact Spear RDC review presented with riding and wind-tunnel context. The test configuration is separate from this candidate's custom build; no aerodynamic ranking or specification is accepted from the video alone.

Cyclingnews Tech · 2026-07-16. Published by Cyclingnews Tech. The description does not establish whether the test bike was supplied or whether the review was sponsored. Disclosure basis.

Takeaways

  • Measured2:40A size-L (standard geometry) RDC frame weighed 758 g; the Rapier cockpit is a required purchase in 19 width/stem combinations, and M/L also come in a lower, longer race geometry.
  • Measured3:53In the publication's independent rider-on wind-tunnel test it was the fastest all-rounder they had tested, 1.8 W faster than a Tarmac SL8, and it got slightly faster as yaw increased; changing wheels shifted the result by about 1.2 W.
  • Ride impression6:08On the road the cockpit felt wobbly in sprints and the frame flexed in hard corners, giving imprecise handling on twisty descents, but it was very comfortable on long rides compared with harsh aero bikes.
  • Measured7:11In their stiffness rig the bottom bracket was less stiff than the tester's steel road bike.
  • Price at publication8:47Frameset-only purchase priced about half an S-Works Tarmac frameset (about US$2,600 less) in July 2026; the tester would choose a standard Tarmac instead for $600 more.
Automatic captions reviewed 2026-10-24. Paraphrased by Chinese Bikes; points apply to the build shown, not to every size or trim.

Sources

These sources support this model page; individual claims retain the confidence of their cited source.

  1. SEKA SPEAR RDC one-month owner report

    Public community post · Community postIdentity: Medium · Specification: Low · Price: Low · accessed 2026-08-17

    An exact-model owner report describes an MR frame, 375×120 mm integrated cockpit, Ultegra electronic shifting and Voso Lite50 wheels. It reports about 7.1 kg before pedals, cages and computer mount and a ¥16,900 list price; fit and ride observations are owner-specific.

  2. SEKA SPEAR RDC frameset

    SEKA Bikes · Manufacturer product pageIdentity: High · Specification: High · Price: Medium · accessed 2026-08-17

    Official exact-platform frameset page supporting the RDC frame weight, BSA bottom bracket, Rapier cockpit and package. It does not prove the components or complete price of the separately observed custom build.

  3. SEKA Spear product development manual

    SEKA Bikes · Manufacturer technical manualIdentity: High · Specification: High · Price: Low · accessed 2026-08-17

    Official Chinese geometry PDF for Spear XS/S/M/MR/L/LR/XL.

  4. SEKA China warranty and service

    SEKA Bikes · Manufacturer regional policy pageIdentity: High · Specification: High · Price: Low · accessed 2026-08-17

    Official China lifetime/5-year/2-year coverage and dealer/WeChat/Taobao routes.

  5. SEKA warranty

    SEKA Bikes · Manufacturer policy pageIdentity: High · Specification: High · Price: Low · accessed 2026-08-17

    Global warranty policy.

  6. SEKA Spear product development white paper

    SEKA Bikes · Manufacturer technical whitepaperIdentity: High · Specification: High · Price: None · accessed 2026-09-01

    Exact Spear development paper reports the RDC size-M frame is 90 g lighter than Exceed RDC and improves stiffness-to-weight by 14.5%; manufacturer protocol details remain limited.

  7. SEKA 2024 full product catalog

    SEKA Bikes · Manufacturer current catalogIdentity: High · Specification: High · Price: Low · accessed 2026-09-01

    Official catalog identifies the Spear RDC and publishes a 32C maximum tire size.

  8. SEKA SPEAR current manufacturer page recheck

    SEKA Bikes · Manufacturer product page recheckIdentity: High · Specification: High · Price: Low · accessed 2026-09-23

    Current SPEAR page supports BSA threaded 68 mm, TeXtreme and ultra-high-modulus pitch-based carbon descriptions, and one-piece molding. It lists five standard and two racing sizes. It distinguishes an RDC 685 g claim from standard 780 g and separately shows 729 +/- 35 g for an M Shadow Black frame; size, paint and inclusion bases are not interchangeable or sufficiently clear to map the latter to the candidate's MR frame.

  9. SEKA SPEAR RDC frameset current store page recheck

    SEKA Bikes · Manufacturer store product page recheckIdentity: High · Specification: High · Price: Medium · accessed 2026-09-23

    The official store names the Spear RDC Frameset and lists frame, fork, seatpost, Rapier integrated handlebar, frameset/Rapier accessories and SPEAR aero bottle-cage set; it also states BSA and a 685 +/- 35 g bare-frame claim. This package is not the candidate's separately reported complete custom-bike BOM. The official gallery is frameset-level only; no rehosting rights are asserted.

  10. SEKA Spear product development manual current reopen

    SEKA Bikes · Manufacturer technical manual reopenIdentity: Medium · Specification: High · Price: None · accessed 2026-09-23

    The retained official manual geometry extraction was reopened. It is titled Spear and is not explicitly mapped to SPEAR RDC. The linked current manufacturer chart is image-only; preserve size availability but do not transfer the manual's numeric geometry to the RDC candidate.

  11. SEKA China warranty and service policy recheck

    SEKA Bikes · Manufacturer warranty recheckIdentity: High · Specification: High · accessed 2026-09-23

    Current China policy states lifetime warranty for SEKA frames, five years for SEKA carbon parts and two years for SEKA spare parts. China scope covers mainland China, Hong Kong, Macau and Taiwan; mainland China buyers needing overseas service pay outbound shipping. Mainland China claim route directs customers to their retailer, official WeChat or official Taobao. This policy does not establish warranty coverage for a complete build's non-SEKA components.

  12. SEKA global warranty and service policy recheck

    SEKA Bikes · Manufacturer warranty recheckIdentity: High · Specification: High · accessed 2026-09-23

    Current global policy confirms lifetime warranty for SEKA framesets, five years for SEKA carbon parts and two years for spare parts. It lists exclusions and states that mainland-China buyers pay shipping for service outside mainland China. Use the China policy for mainland China claim channels.

  13. SEKA Spear RDC complete Taobao dealer listing

    苏州波波单车 on Taobao · Marketplace product pageIdentity: High · Specification: Medium · Price: High · accessed 2026-10-24

    Dealer custom build (整车订制方案). Spec image: 8170 Di2, DT Swiss ARC1100 50 mm black label, Continental Sport tyres with Ride tubes, Guee tape, Prologo saddle, BBR60; frame choice RDC ¥36,999 or standard ¥32,999. Option data matched: two RDC options ¥36,999, standard ¥32,999; 3 units each. Pre-order 15 days, shipping included. No buyer, account, delivery-address or transaction data is retained.

  14. SEKA Spear product page and specifications

    SEKA Bikes · Manufacturer product page recheckIdentity: High · Specification: High · Price: None · accessed 2026-10-25

    One Spear page covers the RDC and Standard frames. Specification block: max tire width (actual) 32 mm, 700c, BSA threaded 68 mm, headset bearings 49.5×40.5×6.5 mm 45/45°, thru-axles front L118.6 mm M12×P1.0 and rear L165.2 mm M12×P1.5, saddle clamp for 7×7, 7×9, 7×10 and 7×11 mm rails. Weights: RDC 685 g and Standard 780 g bare frame, 729 g ±35 g for a size-M Shadow Black frame; weights vary with paint and size. Manufacturer comparisons with Exceed RDC: 5% more stiffness, 14.5% better stiffness-to-weight, 23% more vertical compliance with up to 17 mm seatpost deflection. Five regular and two racing sizes (MR, LR); the page's geometry image matches the 2024–25 catalog table.

  15. SEKA Spear 产品页与规格数据

    SEKA Bikes · Manufacturer product page recheckIdentity: High · Specification: High · Price: None · accessed 2026-10-25

    China specification block: front and rear maximum tire 32C (前后最大胎容量为32C), BSA threaded 68 mm, 700C. RDC 685 g and Standard 780 g are size-M bare-frame weights excluding paint and metal parts; an RDC Shadow Black size M is 729 g ±35 g. Vertical compliance 109 N/mm, 23% above Exceed; seatpost fatigue test 85 mm behind the post for 150,000 cycles at 144 kg, against the ISO reference of 70 mm, 50,000 cycles and 120 kg. Materials described for Spear: TeXtreme base layers, DIALEAD pitch-based 65T/80T and Pyrofil 30T/40T (FAW69) fibre, PMI foam filling and one-mould True-One-Piece construction. Rapier bar: 360–415 mm widths with 80–130 mm stems.

  16. SEKA 2024–2025 model-year catalog, Spear section

    SEKA Bikes · Manufacturer catalog recheckIdentity: High · Specification: High · Price: None · accessed 2026-10-25

    Rendered-pixel recheck of the catalog PDF (SHA-256 a9e36c0311028a6fbe1798902f583c899bb66ea040839543951bbcf0f70b5e1a). One Spear section covers RDC and Standard frames: Rapier integrated bar included with Spear framesets, mechanical and electronic shifting, max tire size up to 32c. Size-M frame weights: RDC 685 g unpainted and 729 g in Shadow Black (±35 g, accessories excluded); Standard 775 g unpainted and 860 g in Twilight Blue; paint changes weight by 20–100 g. Seven sizes (five regular, two racing), 0 or 15 mm offset seatposts, and a geometry table identical to the current official page. Rapier 375×100 mm is about 310 g painted, excluding metal parts.

  17. Spear RDC Opal White complete bike

    SEKA自行车 public account · Manufacturer community postIdentity: High · Specification: None · Price: None · accessed 2026-10-26

    SEKA's own XHS account shares studio photos of a complete Spear RDC in Opal White, built with Shimano Dura-Ace, Scope wheels and Pirelli P Zero tyres. No price, weight, size or tyre width is stated; the parts are a sample build, not a SEKA complete-bike SKU.