Promax SC-1 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.

With a JIS square taper, they are available in 108- and 113-millimeter widths with black anodized cups.

Chainline with a 113 BB spindle: 42.3
Q-Factor with a 113 BB spindle: 151.1

108mm-PX-BB13CM108: 246 grams/8.67 ounces
113mm-PX-BB13CM113: 253 grams/8.92 ounces