Quote:
Originally Posted by rwest
Would it be easier to buy a new front fork with the mount already on it?
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+1
That way you know all the offsets and spacings are correct. You also need to decide what size of rotor you want based on application. I'm guessing that because it is currently a rigid fork and 1.5'' tires that it is just for city commuting in which case a 6'' rotor would be fine
There are different types of caliper mounts ("post mount" and "IS"). One mounts axially and one mounts radially relative to the fork. Caliper selection for either is easy so you may want to do it in reverse and locate a fork and then choose the caliper based on the fork type.
Disc brake hubs again come in different varieties. Shimano spline type or 6 bolt are the two most common. I would go for 6 bolt because replacement rotors are much cheaper and more widely available.