2026 Specialized Tarmac SL8 Pro SRAM vs 2025 Specialized Aethos Pro
The 49 is the Specialized Aethos Pro size closest to your 44 Specialized Tarmac SL8 Pro SRAM. 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 Specialized Aethos Pro
Compared with the Specialized Tarmac SL8 Pro SRAM in 44, the Specialized Aethos Pro in 49 places the top of the head tube 13 mm higher and 9 mm further forward, relative to the bottom bracket. Its wheelbase is 3 mm longer, which can contribute to stability at speed.
- Frame stack
- +13 mm
- Higher front end
- Frame reach
- +9 mm
- Longer frame reach
- Wheelbase
- +3 mm
- Longer: steadier at speed
- Head angle
- n/a
- One of the bikes has no number for this
- Chainstays
- n/a
- One of the bikes has no number for this
The two frames
We can't draw these frames yet. The Specialized Tarmac SL8 Pro SRAM numbers we have for size 44 are missing the head angle, seat angle and chainstay length. The numbers below still compare.
Geometry side by side
| Measurement | Specialized Tarmac SL8 Pro SRAM 44 | Specialized Aethos Pro 49 | Difference |
|---|---|---|---|
| Reach | 366 | 375mm | +9 mm |
| Stack | 501 | 514mm | +13 mm |
| Effective top tube | 496 | 508mm | +12 mm |
| Wheelbase | 970 | 973mm | +3 mm |
| BB height | 266 | 266mm | ±0 mm |
| Seat tube length | 433 | 431mm | −2 mm |
| Head tube length | 99 | 109mm | +10 mm |
| Head tube angle | not listed | 71.75° | |
| Seat tube angle | not listed | 75.5° | |
| Chainstay length | not listed | 410mm | |
| BB drop | not listed | 74mm | |
| Standover | not listed | 705mm | |
| Fork length | not listed | 369mm |
Differences are the Specialized Aethos Pro minus the Specialized Tarmac SL8 Pro SRAM. Full charts: 2026 Specialized Tarmac SL8 Pro SRAM, 2025 Specialized Aethos Pro.
Where each sits in its class
Specialized Tarmac SL8 Pro SRAMSpecialized Aethos Pro
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 SRAMPro SRAM Force AXS | Specialized Aethos Pro |
|---|---|---|
| Frame | Specialized Tarmac SL8 | not listed |
| Fork | Specialized FACT 10r | not listed |
| Shifter | SRAM AXS E1 HRD Force | not listed |
| Derailleur | SRAM AXS E1 Force, SRAM Force AXS | not listed |
| Cassette | SRAM XG-1270 Force | not listed |
| Chain | SRAM E1 Force | not listed |
| Crankset | SRAM E1 Force | not listed |
| Chainring | SRAM Force E1 | not listed |
| Bottom bracket | SRAM DUB | not listed |
| Wheelset | Roval Rapide CL III | not listed |
| Tire | Specialized Turbo Race, Specialized Turbo TLR Race | not listed |
| Brake | SRAM AXS E1 Force, SRAM Force E1 | not listed |
| Rotor | SRAM AXS E1, SRAM 160mm rear | not listed |
| Handlebar | Roval Rapide Cockpit | not listed |
| Stem | Roval Rapide Cockpit | not listed |
| Grips | Supacaz Super Sticky Kush | not listed |
| Bar tape | Supacaz Super Sticky Kush | not listed |
| Seatpost | Specialized Tarmac SL8 Carbon | not listed |
| Saddle | Specialized Power Pro Mirror | not listed |
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