Orbea Orca
Racers who want a climbing Orbea. Orca Aero is the wind-cheating sibling.
Orbea's lightweight race bike, OMX carbon on high kits, and a fit that is race-low without S5 drama. OMX vs OMR changes weight more than geometry.
Racers who want a climbing Orbea. Orca Aero is the wind-cheating sibling.
Orbea's lightweight race bike, OMX carbon on high kits, and a fit that is race-low without S5 drama. OMX vs OMR changes weight more than geometry.
Racers who want BMC's classic race fit. Roadmachine if you need stack.
BMC's lightweight race bike: steep, precise, and a WorldTour stack/reach reference. Less aero than Teammachine R / Timemachine.
Racers and fast club riders who want the modern Tarmac. If you came off an SL7, check that the stack/reach still matches your size.
The current Specialized race bike: lighter than SL7, still aero, and famously 'it just disappears' if the fit is right. Size by stack/reach — the 54/56 split is where a lot of riders hop.
| Measurement | CenturionHyperdrive 2021 |  OrbeaOrca 2025 |  |  SpecializedTarmac SL8 2026 |
|---|---|---|---|---|
| Stackmm | 550 | 552+2 | 570+20 | 544−6 |
| Reachmm | 387 | 385−2 | 390+3 | 384−3 |
| Head tube angle° | 73.0 | 72.8−0.2 | 72.5−0.5 | 73.0 |
| Seat tube angle° | 73.5 | 73.5 | 73.5 | 74.0+0.5 |
| Chainstaymm | 408 | 408 | 410+2 | 410+2 |
| Wheelbasemm | 990 | 981−9 | 996+6 | 978−12 |
| BB dropmm | 70 | 70 | 69−1 | 72+2 |
| BB heightmm | — | — | — | 268 |
| Standovermm | — | — | — | 768 |
| Part | Hyperdrive 56 | Orca 53 | Teammachine SLR 56 | Tarmac SL8 54 |
|---|---|---|---|---|
| Stem | 100 mm | 90 mm | 100 mm | 100 mm |
| Bar | 420 mm | 400 mm | 420 mm | 420 mm |
| Crank | 172.5 mm | 170 mm | 172.5 mm | 172.5 mm |
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