What bottom bracket does a Specialized Stumpjumper (2019 on carbon) use?
The bottom bracket shell standard on a Specialized Stumpjumper (2019 on carbon), and how to pick the right BB.
This frame's shell
| Frame | Specialized Stumpjumper (2019 on carbon) |
|---|---|
| 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
Carbon Specialized Stumpjumper frames from 2019 use a 73 mm BSA threaded shell.
This is the MTB 73 mm width, not the 68 mm road width. A 68 mm road BB is too short for the shell.
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 Tarmac SL8 (2024 on)also BSA / English threadedHeadset on this framesame frame, headsetThru-axle on this framesame frame, axle
SOURCES: Cycling Weekly, Road bike bottom bracket standards explained · Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, BB Overall Width Reference Chart