Another thing (and another big headache) to consider with various disc wheels. If you plan to have some race or training disc brake wheels, you then have to make a huge effort to insure interchangeability.

For example, ALL of your wheels must use identical hubs or else, as soon as you switch wheels, the switched in wheelset will drag on the brakes continuously. Because if the disc brake rotors are not positioned IDENTICALLY in space (laterally) to within FRACTIONS of a milllimeter, then the disc brakes will continuously drag. If you really want to use different hubs on your race vs training wheelsets, it is possible to get shims and shim out all of the disc brake rotors so that they are identical (or close) in spacing, but this is a non-trivial amount of work if you have more than 1 or 2 wheelsets.

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