I did this with my early 80s Specialized Stumpjumper, and I concluded it was a bad idea on that bike. Ultimately, I went back to 26" for the greatly increased variety of suitable tires. I used the Paul Motolite brakes (not worth the $$$ IMO), but it could probably be done with other cantilever brakes. In my experience, V-brakes tend to have more adjustment, generally. You need only a half-inch of upward adjustment, and I'm just guessing Grant designed the bike around having the pads closer to the bottom of the slot for typical cantilevers. My sense is that brakes are not likely to be much of a stumbling block.
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