What bottom bracket does a Specialized Tarmac SL7 (2021 to 2023) use?
The bottom bracket shell standard on a Specialized Tarmac SL7 (2021 to 2023), and how to pick the right BB.
This frame's shell
| Frame | Specialized Tarmac SL7 (2021 to 2023) |
|---|---|
| Shell standard | Specialized OSBB (42 or 46 mm bore) |
| Shell inside diameter | 42 mm bore (alloy, BB30 style) or 46 mm bore (carbon, PF30 style) |
| Shell width | 68 mm (road) and 73 mm (MTB) |
SHELL 68 mm (road) and 73 mm (MTB)
SPINDLE see table
SPINDLE see table
The Specialized Tarmac SL7 uses Specialized OSBB, a 46 mm press-fit bore on carbon frames.
OSBB is a Specialized name covering a 46 mm carbon or 42 mm alloy bore. The SL8 that followed is threaded BSA, not OSBB.
The bottom bracket to buy
Search Amazon for Specialized OSBB bottom bracket for your crank spindleaffiliate searchFind Specialized OSBB bottom bracket for your crank spindle on eBayaffiliate
Fit a crank to this shell
Specialized OSBB shell42 or 46 mm bore30 mm spindle (BB30 / PF30 style) in a Specialized OSBB shelldrops inShimano Hollowtech II (24 mm) in a Specialized OSBB shellneeds a reducerSRAM DUB (28.99 mm) in a Specialized OSBB shellneeds a reducerBottom bracket for Specialized Roubaix (2020 to 2026)also Specialized OSBB
SOURCES: Eminence Cycle Co, WorldTour Road Bike Bottom Bracket Standards 2020-2026 · Hambini Engineering, Specialized OSBB Engineering Guide · Kogel Bearings, Specialized OSBB explained