The Speedco Disc Brake Adapters are CNC machined from 6061 aluminum by Rennen Design Group in the USA. These adapters are intended to be used with a size 120mm disc, and we recommend a Shimano XTR hydraulic caliper for best braking performance.
Speedco offers 6 different sizes / axle configurations.
When you're ordering, ensure that you are specifying the correct adapter for the Speedco frame you have, or are purchasing.
Note: The Velox youth and M2 youth frames use the same adapter.