Key benefits Ensures correct fit for Micro Spline 12-speed drivetrains, reducing the risk of poor engagement or shifting problems. Clear, measurable compatibility criteria make it simple to verify fit before purchase or installation. Practical for repairs, upgrades, and wheelset assembly where exact hub-ring specifications are required. Function and important attributes Function: hub base / hub ring adapter for Micro Spline 12-speed flywheels. Compatibility: for 12-speed Micro Spline (Micro Spline) systems. Size and fit (specifications provided exactly as listed): The hub ring requires M35 x 10 mm height 30 30 teeth The outer diameter of the hub is 15 mm How to judge if this base is suitable for your hub 1. Confirm cassette type Your cassette must be a 12-speed Micro Spline system. 2. Check thread and ring spec Verify your hub ring requires M35 x 10 mm and matches the listed tooth count and height: height 30, 30 teeth. 3. Measure hub outer diameter Measure the hub outer diameter; it should be 15 mm for this base to fit correctly. 4. Match all three criteria The base is suitable only if the cassette type, the ring thread/height/teeth, and the hub outer diameter all match. Use scenarios Upgrading a wheelset to accept a 12-speed Micro Spline cassette where the hub ring specification must match M35 x 10 mm, height 30, 30 teeth. Replacing a worn or damaged hub ring on a hub with a 15 mm outer diameter to restore proper Micro Spline 12-speed function. Assembling or servicing a bike drivetrain in a workshop where precise verification of M35 x 10 mm ring fit and 15 mm hub diameter is required. Notes for installation and purchase Measure your hub and ring carefully and confirm all listed specifications before purchasing. This description reproduces the original compatibility and sizing details exactly to avoid fitment errors. If your hub matches: M35 x 10 mm ring specification height 30, 30 teeth outer diameter 15 mm and you use a 12-speed Micro Spline cassette then this base is the appropriate fit.