Promax SC-1 Square Taper Chromoly JIS Bottom Bracket 108mm Black. 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.
- TECH SPECS
| Bottom Bracket Shell I.D. | 1.37 |
| BB/Frame Interface | English |
| BB Shell Width (mm) | 68 |
| Weight | 246 |
| Spindle Interface Type | Square Taper JIS |
| Spindle Length | 108 |
| Defined Color | Black |
