MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS

MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS MSW

MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS

MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS

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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.

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$19.99
$19.99
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Specifications

  • Shell Threading: English (BSA)
  • Shell Width: 68mm
  • Spindle Length: 122.5mm
  • Spindle Interface: JIS square taper
  • Cup Material: Steel
  • Compatibility: JIS square taper cranks on English-threaded frames

FAQ

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.

Best For

Builds, rebuilds, and replacement applications on English-threaded bikes running JIS square taper cranks. A practical, reliable choice for entry to mid-level road and mountain drivetrains where proven cup-and-spindle simplicity is preferred over modern press-fit systems.

MSW ST100 Bottom Bracket - English | 68 x 122.5mm | Square Taper JIS Reviews:

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