What bottom bracket does a Specialized Tarmac SL8 (2024 on) use?
The bottom bracket shell standard on a Specialized Tarmac SL8 (2024 on), and how to pick the right BB.
This frame's shell
| Frame | Specialized Tarmac SL8 (2024 on) |
|---|---|
| Shell standard | BSA / English threaded (1.37" x 24 TPI) |
| Shell inside diameter | 1.37 in (about 34.8 mm) threaded bore |
| Shell width | 68 mm (road), 73 mm (MTB), 83 mm and 100 mm (fat / DH) |
SHELL 68 mm (road), 73 mm (MTB), 83 mm and 100 mm (fat / DH)
SPINDLE see table
SPINDLE see table
The Specialized Tarmac SL8 from 2024 uses a 68 mm BSA threaded shell (1.37 in x 24 TPI).
Earlier Tarmac SL7 frames used Specialized OSBB press fit. The SL8 is threaded, so an OSBB press-fit BB will not fit.
The bottom bracket to buy
Search Amazon for BSA / English threaded bottom bracket for your crank spindleaffiliate searchFind BSA / English threaded bottom bracket for your crank spindle on eBayaffiliate
Fit a crank to this shell
BSA / English threaded shell1.37" x 24 TPIShimano Hollowtech II (24 mm) in a BSA / English threaded shelldrops inSRAM DUB (28.99 mm) in a BSA / English threaded shelldrops inSRAM GXP (24/22 mm) in a BSA / English threaded shelldrops inBottom bracket for Specialized Aethos (2021 on)also BSA / English threadedHeadset on this framesame frame, headsetThru-axle on this framesame frame, axle
SOURCES: Eminence Cycle Co, WorldTour Road Bike Bottom Bracket Standards 2020-2026 · Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, BB Overall Width Reference Chart