Riders on used SL6s or comparing a previous Tarmac to SL7/SL8. Check stack/reach — sizes did not stay still.
The 2018–2020 Tarmac: disc-era race geometry before SL7's aero integration. Still a low, racy fit; cockpit is more conventional than SL7/SL8.
Aero racers. If you want light and conventional, R5; if you want endurance, Caledonia.
The aero Cervelo: V-stem, deep tubes, and a bike that wants to be ridden fast in a straight line and still corners better than its looks suggest.
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.
Fast road riders who want Orbea aero. Orca if you care more about weight.
Aero Orbea race bike. Deeper tubes than Orca, same size run so many riders can twin the two on stack/reach.
| Measurement |  SpecializedTarmac SL6 2019 |  CerveloS5 2022 |  |  OrbeaOrca Aero 2022 |
|---|---|---|---|---|
| Stackmm | 565 | 565 | 565 | 542−23 |
| Reachmm | 391 | 392+1 | 392+1 | 388−3 |
| Head tube angle° | 73.5 | 73.0−0.5 | 72.3−1.2 | 72.8−0.7 |
| Seat tube angle° | 73.5 | 73.0−0.5 | 73.5 | 73.5 |
| Chainstaymm | 405 | 410+5 | 410+5 | 408+3 |
| Wheelbasemm | 991 | 994+3 | 1000+9 | 980−11 |
| BB dropmm | 72 | 70−2 | 69−3 | 68−4 |
| BB heightmm | — | — | — | — |
| Standovermm | — | — | — | — |
| Part | Tarmac SL6 56 | S5 56 | Teammachine SLR 56 | Orca Aero 53 |
|---|---|---|---|---|
| Stem | 100 mm | 100 mm | 100 mm | 90 mm |
| Bar | 420 mm | 420 mm | 420 mm | 400 mm |
| Crank | 172.5 mm | 172.5 mm | 172.5 mm | 170 mm |
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