The BB-MT500-PAShimano is a PressFit bottom bracket designed for MTB frames fitted with an BB89.5 or BB92 socket. Developed using Hollowtech II technology, it ensures excellent retention of the 24 mm bottom bracket axle whilst promoting efficient power transfer. Thanks to its high-quality bearings and reinforced sealing, it offers smooth rotation and impressive durability for regular use in XC, trail riding or sport cycling.

Compatible with Hollowtech II cranksets from Shimano, and many other 24 mm-axle cranksets, this model fits frames with an internal diameter of 41 mm. Its level of water resistance, comparable to that of the higher-end ‘ Shimano ’ models, helps to limit the ingress of water and mud, thereby maintaining performance over time.

Key features

• Compatible with PressFit BB89.5 and BB92 frames
• Shimano Hollowtech II technology
• Compatible with 24 mm bottom bracket axles
• Smooth-running bearings for improved efficiency
• Enhanced sealing for a longer service life
• Bottom bracket diameter 41 mm
• Ideal for XC, Trail and All-Mountain mountain bikes
• Easy to fit using the correct PressFit tools

FAQ

Which cranksets is this bottom bracket compatible with?

The BB-MT500-PA is designed for Hollowtech II cranksets from Shimano, fitted with a 24 mm axle. It may also be compatible with other cranksets using this standard.

What is the difference between BB89.5 and BB92?

Both standards use an internal diameter of 41 mm. The main difference lies in the frame width: 89.5 mm or 92 mm. Shimano has designed the BB-MT500-PA to be compatible with both.

Is this bottom bracket suitable for intensive mountain biking?

Yes. Its improved water resistance and the quality of its bearings allow for regular use in demanding conditions, including on wet or muddy terrain.

What frame diameter is required?

The frame must have a PressFit socket with an internal diameter of 41 mm to accommodate this bottom bracket.

Can it replace a BB71-41A Shimano?

Yes, many riders and mechanics consider the BB-MT500-PA to be a direct replacement for the BB71-41A on BB89.5/BB92-compatible frames.