The biggest difference with the new MT901-B hub compared to its predecessor Is Shimano’s new Micro Spline freehub which was designed to accompany Shimano’s new 12-speed cassette. Shimano had to recreate their freehub body in order to allow their new cassette to feature gears smaller than 12 teeth. Their new cassette features a 10 to 51 tooth range. The new hub also transitions from the traditional use of pawls in a free wheel to a design which uses a pulley freewheel. This allows the hub to engage every 7.6 degrees which immensely reduces the amount of play before your cassette engages. One notable features of the new pawl-less design known as Scylence technology, is as the name implies, the hub makes zero noise when pedaling and coasting. Inside the hub are tried and true cone bearings with hardened and polished steel bearing shells and stainless steel balls provides an incredible reliable and durable system, boasting exceptional service life and ultra smooth performance.
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