Chinese Bikes

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

SEKAComplete bikeResearch profile

SEKA Spear (standard frame) 105 Di2 dealer build

¥20,800China price · 2026-10-24
Choose another bike
Category
Aero road
Complete weight
7.0 kg
Tire clearance
32 mm
Bottom bracket
BSA threaded, 68 mm
Sizes
XS, S, M, L and XL, plus racing MR and LR

Overview

SEKA Spear (standard frame) 105 Di2 dealer build. A fully itemised dealer build on the standard Spear frame with 105 Di2 and Magene carbon wheels.

The recorded complete-bike price is ¥20,800; its date and basis remain visible below.

Buying context

Before buying, verify Cockpit and seatpost sizes in this build (SEKA framesets ship with a Rapier bar); Exact selected-size stock, warranty and checkout total.

Specifications and evidence

Product type
Complete bike
Category
Aero road
Evidence maturity
Research profile
Price basis
China price · 2026-10-24
Drivetrain
Shimano 105 Di2 R7170 full groupset system reference
Wheels
Magene Ultra Dark 508 carbon-spoke, 50 mm front / 58 mm rear
Tires
Michelin Power Cup clincher with Magene TPU tubes
Complete weight
7.0 kg
Complete weight basis
Dealer-stated build weight; size not stated
Frame
Spear Standard carbon frame with the Wind Eye seat cluster. SEKA lists 780 g for a size-M bare frame without paint or metal parts (775 g unpainted in the 2024–25 catalog, 860 g painted Twilight Blue).
Frame material
Carbon. SEKA publishes fibre grades only for the RDC frame (TeXtreme and pitch-based fibre).
Frame construction
SEKA's Spear pages and the Standard store listing describe one-mould True-One-Piece construction; the frame routes cables internally through SEKA's Rapier bar system
Stiffness evidence
No stiffness figure is published for the Standard frame; SEKA's 5% stiffness and 14.5% stiffness-to-weight gains compare the RDC with Exceed RDC.
Tire clearance
32 mm
Tire clearance basis
Official Spear maximum actual tyre width, front and rear, for both RDC and Standard frames (current global and China pages; 2024–25 catalog). The dealer does not state its tyre width.
Bottom bracket
BSA threaded, 68 mm
Sizes
XS, S, M, L and XL, plus racing MR and LR

Other documented builds

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

Different dealer: standard frame Ultegra Di2 + DT Swiss ARC 1100 50Drivetrain: Shimano Ultegra Di2 R8170Price: ¥32,999 on 2026-10-24 — 苏州波波单车 standard-frame optionWheels: DT Swiss ARC 1100 50 mm
Owner build: size-L Standard, 105 Di2, Voso 50 mm wheelsDrivetrain: Shimano 105 Di2 R7170 with a Dura-Ace chainWeight: 7.5 kg — Owner-stated; pedal, computer and power-meter inclusion not statedWheels: Voso Ultimate 50 Ultra carbonTires: Continental GP5000 STR 28 mm tubeless

Owner build after about 18 months; not a dealer package and no price.

Price history

ObservedPriceTypeConditions
¥20,800Observed market recordHomeBike custom-build listing, any size · Made to order with a deposit; ¥20,800 is the full 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

Long-term reviewRelationship unknown

10,000km Later: Was My Chinese Superbike Worth It?

A 17-month, roughly 10,000 km follow-up on the reviewer's SEKA Spear.

David Arthur - Just Ride Bikes · 2026-06-22. How the frame was obtained is not stated; this is the same Ultegra Di2 Spear as his first review, professionally built by a UK shop. Disclosure basis.

Takeaways

  • Fit check3:56The large (about 56 cm) matched a Tarmac's stack and reach for him at 181 cm; the frameset comes with a chosen bar width and stem length, a sturdy computer mount and aero bottles.
  • Build note5:16SEKA sells framesets only, through one UK shop; the builder found clean bottom-bracket threads, steerer surfaces and good tolerances.
  • Finish and faults6:19Over about 10,000 km it was trouble-free and needed no warranty claims.
  • Ride impression7:39He rates it as quick as a Madone, Aeroad or Tarmac (behind a BMC Teammachine R), with excellent cornering, but the stiff front end remains the one comfort weakness against a compliant seatpost and rear.
Automatic captions reviewed 2026-10-25. Paraphrased by Chinese Bikes; points apply to the build shown, not to every size or trim.
Hands-on reviewRelationship unknown

New Seka Spear review: Better than a Specialized Tarmac SL8?

A first-month ride review of the SEKA Spear built with Ultegra Di2, compared with the Specialized Tarmac SL8.

David Arthur - Just Ride Bikes · 2025-01-12. Sponsored segment for an unrelated camera; how the frame was obtained is not stated. The frame is a standard Spear judging by his £2,250 frameset price and weight comparison, built with Ultegra Di2 rather than the candidate's 105 Di2. Disclosure basis.

Takeaways

  • Build note0:42The 'wind eye' openings at the seatstay junction are the signature feature; the one-piece bar has a flat, broad top profile he finds uncomfortable when climbing.
  • Price at publication2:03Frame and fork retail at £2,250 in the UK, half a Tarmac SL8 frameset; frame weight is closer to a non-S-Works SL8, and SEKA offers a lifetime warranty but no complete bikes.
  • Ride impression5:35Fast but not electric; on his test loop it was slower than pure aero bikes but quicker than a Van Rysel RCR, and it reminds him of a Tarmac SL7.
  • Ride impression7:33The front end is very stiff and harsh on rough roads while seated comfort is excellent, so the bike feels unbalanced front to rear.
  • Fit check9:15Five standard sizes plus two race sizes with lower stack and longer reach; at 181 cm he chose L with a 110 mm stem and no spacers.
Automatic captions reviewed 2026-10-25. 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 105 Di2 HomeBike listing

    HomeBike on Taobao · Marketplace product pageIdentity: High · Specification: Medium · Price: High · accessed 2026-10-24

    Custom-assembled build at ¥20,800 for every size (3-5 units). Detail image: Seka Spear standard frameset, 7170 Di2 full groupset, MT800 (CL800) rotors, Magene Ultra Dark 508 carbon-spoke wheels (50 mm front, 58 mm rear), Michelin Power Cup clinchers with Magene TPU tubes, Power Comp saddle, Shimano PRO tape; 7 kg. The shop states a deposit is taken for custom builds; ¥20,800 is the full price. No buyer, account, delivery-address or transaction data is retained.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. SEKA Spear Frameset (Standard) official store page

    SEKA Bikes · Manufacturer store product pageIdentity: High · Specification: Medium · Price: Medium · accessed 2026-10-25

    Global store product titled Spear Frameset, the Standard frame sold separately from the Spear RDC Frameset, at USD 2,201 in seven finishes (Currant Black, Achromatic Silver, Twilight Blue, Borealis Blue, Cosmic Beige, Mint Green, Frosty Blue) and sizes XS–XL including MR and LR; several options were in stock. The description repeats the Wind Eye and True-One-Piece moulding features. Gallery photos show frame, fork, seatpost and Rapier bar only, not a dealer complete build; global price and stock do not establish mainland China checkout.

  7. 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.

  8. SEKA Spear Standard owner build after 18 months

    XHS owner post · Community postIdentity: High · Specification: Low · Price: None · accessed 2026-10-26

    Owner lists a Spear Standard frame in Achromatic Silver (素银), size L, after about 18 months of riding: Shimano 105 Di2 R7170 groupset with a Dura-Ace chain, 50-34 chainrings, Voso Ultimate 50 Ultra wheels, Continental GP5000 STR 28 mm tubeless tyres and a Rapier 40-100 bar. The owner states the bike has stayed at 7.5 kg; pedals, computer and power-meter inclusion are not stated. Components are the owner's choices.