January 24, 2024 New MSR Freehub Standard for Shimano GRXBike Tech296Views0Likes0Comments In order to accommodate broader range cassettes, Shimano has adopted a new freehub standard for gravel bikes. The freehub used is the MSR, Micro Spline Road. It supports 12 speed. This allows gravel bikes to use Shimano Micro Spline freehubs.Read more