Bottom bracket BB thread press-in central axis for mountain road bikes with fixed gear Compatibility and fit - Suitable for bottom bracket shell widths 68 mm, 73 mm, 90 mm, and 92 mm - Designed for mountain road bikes with a fixed gear mechanism - Press-in central axis provides a stable and reliable connection within the frame Quality and components - Bearing type: steel ball bearings for smooth operation - Bearing size: 37 x 25 x 7 mm - Includes 1 piece Key benefits - Smooth rotation and consistent performance thanks to steel ball bearings - Wide compatibility with common shell widths for mountain road bikes - Simple press-in installation with a single-piece bearing for straightforward maintenance - Stable, reliable connection that supports fixed-gear setups What to expect in use - Replacing a worn bottom bracket on a mountain road bike converted to fixed gear - Upgrading a frame with 68/73 mm or 90/92 mm shells to improve stability and reliability - Routine maintenance or rebuild for a fixed-gear mountain bike to ensure smooth operation Recommended scenarios - You are converting a mountain road bike to a fixed-gear setup and need a dependable bottom bracket option - You have a frame with 68/73 mm or 90/92 mm BB shell widths and require a press-in central axis bottom bracket - You want a simple, single-piece bearing solution to minimize installation steps and potential misalignment