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julio 22, 2026

Promax SC-1 Square Taper JIS BSA (English) Bottom Bracket 68x113mm Spindle Crank

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. CNC-machined alloy cups. JIS square taper. Hollow chromoly spindle. Chainline with a 113 BB spindle: 42.3. Q-Factor with a 113 BB spindle: 151.1. Item Specifications: Weight, 253, BB/Frame Interface, English, Spindle Interface Type, Square Taper JIS, BB Shell Width, 68, Defined Color, Black, Bottom Bracket Shell I.D., 1.37", Spindle Length, 113,.