2026 Specialized Tarmac SL8 Pro Shimano vs 2027 Trek Madone SLR Gen 8 No. ICON
The L is the Trek Madone SLR Gen 8 No. ICON size closest to your 58 Specialized Tarmac SL8 Pro Shimano. We match frame stack and reach. This is a geometry comparison, not a fit recommendation; stem, spacers, handlebars and saddle setup also affect your riding position.
What changes on the Trek Madone SLR Gen 8 No. ICON
Compared with the Specialized Tarmac SL8 Pro Shimano in 58, the Trek Madone SLR Gen 8 No. ICON in L places the top of the head tube 9 mm lower and 8 mm further back, relative to the bottom bracket.
- Frame stack
- −9 mm
- Lower front end
- Frame reach
- −8 mm
- Shorter frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- +0.3°
- About the same head angle
- Chainstays
- +1 mm
- About the same
The two frames
We can't draw these frames yet. The Specialized Tarmac SL8 Pro Shimano numbers we have for size 58 are missing the wheelbase. The numbers below still compare.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Pro Shimano 58 | Trek Madone SLR Gen 8 No. ICON L | Difference |
|---|---|---|---|
| Reach | 402 | 394 | −8 mm |
| Stack | 591 | 582 | −9 mm |
| Head tube angle | 73.5 | 73.8° | +0.3° |
| Seat tube angle | 73.5 | not listed | |
| Chainstay length | 410 | 411 | +1 mm |
| Wheelbase | not listed | 990 | |
| Head tube length | 184 | 172 | −12 mm |
| Effective top tube | not listed | 568 | |
| BB drop | not listed | 68 | |
| Standover | not listed | 820 | |
| Seat tube length | not listed | 548 |
Differences are the Trek Madone SLR Gen 8 No. ICON minus the Specialized Tarmac SL8 Pro Shimano. Full charts: 2026 Specialized Tarmac SL8 Pro Shimano, 2027 Trek Madone SLR Gen 8 No. ICON.
Where each sits in its class
Specialized Tarmac SL8 Pro ShimanoTrek Madone SLR Gen 8 No. ICON
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 | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 | Trek Madone SLR Gen 8 No. ICONSLR 9 AXS Gen 8 - No. 76 ICON |
|---|---|---|
| Frame | Specialized Tarmac SL8 | not listed |
| Fork | Specialized FACT 10r | Trek Madone Gen 8 one-piece |
| Shifter | Shimano Ultegra R8170 | SRAM RED AXS E1 |
| Derailleur | Shimano Ultegra R8150 Di2 | SRAM RED AXS E1 |
| Cassette | Shimano Ultegra | SRAM RED XG-1290 E1 |
| Chain | Shimano XT M8100 | SRAM Red E1 |
| Crankset | Shimano Ultegra R81000 | SRAM RED AXS E1 |
| Bottom bracket | Shimano Threaded BSA | SRAM DUB |
| Wheelset | Roval Rapide CL III | Bontrager Aeolus RSL |
| Tire | Specialized S-Works Turbo | Bontrager Aeolus RSL RD |
| Brake | Shimano Ultegra R8170 | not listed |
| Rotor | Shimano Ultegra R8170 | SRAM Paceline |
| Handlebar | Roval Rapide Cockpit | not listed |
| Stem | Roval Rapide Cockpit | not listed |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized S-Works Tarmac SL8 | Trek Madone |
| Saddle | Specialized Power Pro | Trek Aeolus RSL |
| Battery | not listed | SRAM AXS |
| Headset | not listed | Bontrager Expander Plug |
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