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My front wheel is secured with 14mm bolts, while my rear wheel uses 1/2 inch bolts. Turns out my multitool has only a 14mm wrench, so I can't change the rear tire with it.
Rather than carrying around a whole other wrench, or buying a different multitool, my first thought is to swap the 1/2" bolts for 14mm ones. Assuming I can find a set with the appropriate inner diameter, is there any reason this would be a problem?
If you can find nuts with the correct thread (both diameter and thread pitch) but a smaller wrench size, you can replace the ones that are there. But note that the existing nuts probably have a built-in washer, and any replacement should have the built-in washer not too much smaller than what you have. In a pinch you can use regular washerless nuts and a separate loose washer, but that's not as reliable.
It would be easier to find a new wrench. Almost certainly the rear is not an inch sized nut but a larger metric size, and a combo wrench can be found to fit both.
(At least in the US, "bolt" refers to a threaded rod with a head on one end. "Nut" is the small piece with a threaded hole in it.)
