NEW Promax SC-1 Square Taper Chromoly JIS Bottom Bracket 108mm Black variant-size-37 SRAM brings their premier 12-speed

SRAM brings their premier 12-speed drivetrain features such as a wide range

5-year warranty

SHIMANO Equivalent ST-EF51 / ST-EF40

Cage Length Long Chain Wrap Capacity (teeth) 43 Color Black Drivetrain Speeds 6

NEW Promax SC-1 Square Taper Chromoly JIS Bottom Bracket 108mm Black variant-size-37 SRAM brings their premier 12-speedSC 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 Defined Color: Black Bottom Bracket Shell I. D.: 1. 37 Spindle Length: 108 Spindle Interface