What bottom bracket does a Specialized Roubaix (2020 to 2026) use?
The bottom bracket shell standard on a Specialized Roubaix (2020 to 2026), and how to pick the right BB.
This frame's shell
| Frame | Specialized Roubaix (2020 to 2026) |
|---|---|
| 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 Roubaix uses Specialized OSBB, a 46 mm press-fit bore on the carbon frame.
Confirm carbon (46 mm) versus alloy (42 mm) before buying. OSBB is a bore, not a thread, so measure it.
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 Tarmac SL7 (2021 to 2023)also Specialized OSBB
SOURCES: Eminence Cycle Co, WorldTour Road Bike Bottom Bracket Standards 2020-2026 · Kogel Bearings, Specialized OSBB explained · Hambini Engineering, Specialized OSBB Engineering Guide