Promax SC-1 JIS Square Taper Bottom Bracket

SC-1 bottom brackets are the perfect choice for those who still prefer the low weight and simplicity of square taper cranks. Each bottom bracket is hand assembled using a hollow chromoly spindle precision sealed bearings forged and CNC-machined alloy cups and a composite center spacer/seal.

Hollow chromoly spindle

CNC-machined alloy cups

JIS square taper

Bottom Bracket Shell I.D.	1.37
BB/Frame Interface	English
BB Shell Width (mm)	68
Weight	246, 253
Spindle Interface Type	Square Taper JIS
Spindle Length	108, 113
Defined Color	Black