MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS
Bottom Brackets
MSW ST100 Bottom Bracket - English · 68 x 122.5mm · Square Taper JIS
MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS
The MSW ST100 Bottom Bracket is a dependable, no-fuss English-threaded square taper unit built for bikes running a JIS square taper crankset. Read the overview
At a glance
- Shell Width
- 68mm
- Shell Threading
- English (BSA)
- Spindle Length
- 122.5mm
- Spindle Interface
- JIS square taper
1 in stock
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Overview
Is the MSW ST100 the Right Bottom Bracket for Your Build?
The MSW ST100 Bottom Bracket is a dependable, no-fuss English-threaded square taper unit built for bikes running a JIS square taper crankset. The 68mm shell width covers the most common road and mountain bike frame standard, and the 122.5mm spindle length matches a wide range of JIS-compatible cranks for correct chainline and smooth pedaling mechanics. Steel cup construction delivers long-lasting durability in an everyday riding application where a serviceable, reliable interface matters more than grams saved.
Compatible with standard English (BSA) threaded bottom bracket shells, the ST100 threads in with the same tools used for any cup-and-spindle BB. Designed to work with JIS square taper cranks from a range of manufacturers, including entry to mid-level road and mountain drivetrains. A straightforward, proven solution for builds, rebuilds, and replacement applications where a reliable square taper bottom bracket is needed at a practical price.
All the specs
MPN 17-000429
- Shell Threading
- English (BSA)
- Shell Width
- 68mm
- Spindle Length
- 122.5mm
- Spindle Interface
- JIS square taper
- Cup Material
- Steel
Works with
- JIS square taper cranks on English-threaded frames
FAQ
Good questions
Get to know MSW
There's more to MSW than this one product. Our MSW page has the full MSW lineup we carry and more about the brand.
Visit the MSW page →What is the difference between JIS and ISO square taper?
JIS and ISO square taper spindles look identical but have slightly different taper angles. JIS cranks sit about 4mm deeper on the spindle than ISO cranks. Using the wrong pairing can result in poor chainline, crank creak, or damage to the crank arm. The ST100 is JIS, which is compatible with most Shimano and Asian-manufactured cranksets.
What tools do I need to install the ST100?
You will need a standard bottom bracket cup wrench (Park Tool BBT-22 or equivalent) and a crank puller for removal. Installation follows standard English threading: the drive-side (right) cup is left-hand threaded, and the non-drive side is right-hand threaded.
Is a 122.5mm spindle the correct length for my crankset?
Spindle length affects chainline and crank clearance. 122.5mm is a common length for road and mountain drivetrains on 68mm English shells, but always verify the recommended spindle length for your specific crankset before purchasing.
Reviews
What riders say about the MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS
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