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.
| Measurement |  SpecializedTarmac SL6 2019 |  CerveloS5 2022 |  |
|---|---|---|---|
| Stackmm | 565 | 565 | 565 |
| Reachmm | 391 | 392+1 | 392+1 |
| Head tube angle° | 73.5 | 73.0−0.5 | 72.3−1.2 |
| Seat tube angle° | 73.5 | 73.0−0.5 | 73.5 |
| Chainstaymm | 405 | 410+5 | 410+5 |
| Wheelbasemm | 991 | 994+3 | 1000+9 |
| BB dropmm | 72 | 70−2 | 69−3 |
| BB heightmm | — | — | — |
| Standovermm | — | — | — |
| Part | Tarmac SL6 56 | S5 56 | Teammachine SLR 56 |
|---|---|---|---|
| Stem | 100 mm | 100 mm | 100 mm |
| Bar | 420 mm | 420 mm | 420 mm |
| Crank | 172.5 mm | 172.5 mm | 172.5 mm |
... Cervélo S5 frameset (includes seat post, forks, handlebars/stem, BB fittings): $6,500. Bike review – 2019 Cervelo S5 part 01, unboxing. @ride ...
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