Promax SC-1 Bottom Bracket

The Promax SC-1 uses the JIS standard, which is the most common square taper interface found on the vast majority of modern and vintage square taper cranksets. If your current crankset is marked JIS, this will be a direct fit.

The hollow chromoly spindle is designed to shave weight without sacrificing the stiffness required for efficient power transfer. It offers a noticeable weight reduction compared to solid steel spindles while maintaining the durability needed for daily riding.

This specific unit features a 113 mm spindle length. Before purchasing, verify that your current bottom bracket matches this length, as using the wrong size will negatively impact your chainline and shifting performance.

This bottom bracket utilizes precision sealed cartridge bearings. These are designed to be maintenance-free and weather-resistant, but they are not user-serviceable; if they eventually wear out, the entire unit is typically replaced.

No, this bottom bracket is designed exclusively for frames with standard English (BSA) threading. It will not thread into frames with Italian or French shell standards.