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What is the difference between front and rear rim brake calipers? Is it just that the bolt is longer at the front to go through the fork - if so, presume a rear can be used at the front if the nut is long enough to engage the threads?
For the majority of calipers out there, yes, and so a very long nut would do the job. One thing to account for is the orientation of the brake pad holders. they'll be the wrong way around :)
What is the difference between front and rear rim brake calipers? Is it just that the bolt is longer at the front to go through the fork - if so, presume a rear can be used at the front if the nut is long enough to engage the threads?