2025 Orbea Orca Aero M20iLTD vs 2026 Specialized Tarmac SL8 Pro Shimano
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 Pro Shimano
- Frame stack
- n/a
- One of the bikes has no number for this
- Frame reach
- +4 mm
- Longer frame reach
- Wheelbase
- n/a
- One of the bikes has no number for this
- Head angle
- +0.8°
- Steeper: sharper steering
- Chainstays
- +2 mm
- About the same
The two frames
We can't draw these frames yet. The Orbea Orca Aero M20iLTD numbers we have for size 51 are missing the stack and wheelbase. The numbers below still compare.
Geometry side by side
| Measurement | Orbea Orca Aero M20iLTD 51 | Specialized Tarmac SL8 Pro Shimano 54 | Difference |
|---|---|---|---|
| Reach | 380 | 384 | +4 mm |
| Head tube angle | 72.2 | 73 | +0.8° |
| Seat tube angle | 73.7 | 74 | +0.3° |
| Chainstay length | 408 | 410 | +2 mm |
| Wheelbase | not listed | 978 | |
| Standover | 754 | not listed | |
| Seat tube length | 499 | not listed | |
| Fork length | 368 | not listed | |
| Head tube length | 107 | 137 | +30 mm |
| Stack | not listed | 544 |
Differences are the Specialized Tarmac SL8 Pro Shimano minus the Orbea Orca Aero M20iLTD. Full charts: 2025 Orbea Orca Aero M20iLTD, 2026 Specialized Tarmac SL8 Pro Shimano.
Where each sits in its class
Orbea Orca Aero M20iLTDSpecialized Tarmac SL8 Pro Shimano
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 | Orbea Orca Aero M20iLTDM20iLTD | Specialized Tarmac SL8 Pro ShimanoPro - Shimano Ultegra Di2 |
|---|---|---|
| Frame | Orbea Orca Aero | Specialized Tarmac SL8 |
| Shifter | Shimano ST-8170 Ultegra Di2 | Shimano Ultegra R8170 |
| Derailleur | Shimano Ultegra | Shimano Ultegra R8150 Di2 |
| Cassette | Shimano Ultegra | Shimano Ultegra |
| Crankset | Shimano Ultegra Mid Compact | Shimano Ultegra R81000 |
| Wheelset | OQUO Road Performance RP45TEAM | Roval Rapide CL III |
| Tire | Vittoria Corsa N.Ext G2.0 | Specialized S-Works Turbo |
| Brake | Shimano Ultegra R8170 Di2 | Shimano Ultegra R8170 |
| Rotor | Shimano Ultegra R8170 | Shimano Ultegra R8170 |
| Fork | not listed | Specialized FACT 10r |
| Chain | not listed | Shimano XT M8100 |
| Bottom bracket | not listed | Shimano Threaded BSA |
| Handlebar | not listed | Roval Rapide Cockpit |
| Stem | not listed | Roval Rapide Cockpit |
| Bar tape | not listed | Supacaz Super Sticky Kush |
| Seatpost | not listed | Specialized S-Works Tarmac SL8 |
| Saddle | not listed | Specialized Power Pro |
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