2025 Trek Speed Concept SLR vs 2025 Specialized Tarmac SL8 LTD
We can't match sizes for these two: one of them has no stack and reach for the sizes shown.
What changes on the Specialized Tarmac SL8 LTD
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- −16 mm
- Shorter frame reach
- Wheelbase
- +11 mm
- Longer: steadier at speed
- Head angle
- +1.0°
- Steeper: sharper steering
- Chainstays
- ±0 mm
- About the same
The two frames
We can't draw these frames yet. The Trek Speed Concept SLR numbers we have for size M are missing the seat angle. The numbers below still compare.
Geometry side by side
| Measurement | Trek Speed Concept SLR M | Specialized Tarmac SL8 LTD 58 | Difference |
|---|---|---|---|
| Reach | 416 | 400mm | −16 mm |
| Stack | 517 | not listed | |
| Head tube angle | 72.5° | 73.5° | +1.0° |
| Effective top tube | 518 | 577mm | +59 mm |
| Chainstay length | 410 | 410mm | ±0 mm |
| Wheelbase | 995 | 1006mm | +11 mm |
| BB drop | 80 | 72mm | −8 mm |
| Standover | 785 | 808mm | +23 mm |
| Seat tube length | 525 | 515mm | −10 mm |
| Head tube length | 90 | 184mm | +94 mm |
| Seat tube angle | not listed | 73.5° | |
| BB height | not listed | 268mm | |
| Fork length | not listed | 370mm |
Differences are the Specialized Tarmac SL8 LTD minus the Trek Speed Concept SLR. Full charts: 2025 Trek Speed Concept SLR, 2025 Specialized Tarmac SL8 LTD.
Where each sits in its class
Trek Speed Concept SLRSpecialized Tarmac SL8 LTD
AggressivePositionUpright
CalmSteeringQuick
PlayfulBalancePlanted
Each bike is ranked against the other road bikes on Quiver, on frame geometry alone. Not your hand position or ride feel.
What each ships with
The stock build of each bike's first listed trim. Parts that match are dimmed.
| Part | Trek Speed Concept SLRSLR 7 | Specialized Tarmac SL8 LTDS-Works LTD |
|---|---|---|
| Frame | Trek OCLV | Specialized S-Works Tarmac SL8 FACT |
| Fork | Trek SC | not listed |
| Shifter | Shimano Dura-Ace R9180 | SRAM RED AXS |
| Derailleur | Shimano Ultegra Di2, Shimano Ultegra R8150 Di2 | SRAM Red AXS |
| Cassette | Shimano Ultegra R8100 | SRAM RED XG-1290 |
| Chain | Shimano XT M8100 | SRAM RED |
| Crankset | Shimano Ultegra R8100 | SRAM RED AXS Power Meter |
| Chainring | Shimano Ultegra R8100, Shimano Ultegra | not listed |
| Bottom bracket | Praxis T47 | SRAM DUB |
| Wheelset | Bontrager Aeolus Pro 51 | Roval Rapide CLX II |
| Tire | Bontrager R3 | Specialized S-Works Turbo Rapidair 2Br |
| Brake | Shimano Dura-Ace | SRAM Red AXS |
| Rotor | Shimano DURA-ACE | not listed |
| Handlebar | Trek Speed Concept | Roval Rapide Cockpit |
| Bar tape | Bontrager Supertack Performance | not listed |
| Seatpost | Trek Speed Concept SLR | not listed |
| Saddle | Bontrager Hilo | Specialized S-Works Power |
| Stem | not listed | Roval Rapide Cockpit |
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