Shimano QR x 135 mm Available Shimano Micro Spline Bicycle Rear Hubs
About Shimano - "Shimano practices good local citizenship, pursues continued access to those areas that are enjoyed by outdoor enthusiasts, and is committed to minimizing our impact on the environment."
This is hub spacing and is the width of the hub. It must match your frame specifications.
These models are available for online purchasing and can be shipped directly to you.
The cassette body type is the type of cassette and number of speeds the hub will accept.