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Just curiouse, I see a lot of variation out there, lots of folks going with one size on the front, another on the rear. Myself, I'm thinking of keeping the same size, so that I can carry a usable spare for long distance trips. I've been looking at a lot of finished F1 pics, and it just seems like too many choices!
If you are sticking with the same size all around, you might want to consider 225:75/R15s. I used them on my 48 F-1 and was happy with them. They are close to stock looking...