I'm running 23mm tyres on my '77 A-frame, loads of space left, 28mm seems plausible. It originally came with centrepull brakes so it's probably long reach, but then yours is 4 years younger so yours might be different.
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I'm running 23mm tyres on my '77 A-frame, loads of space left, 28mm seems plausible. It originally came with centrepull brakes so it's probably long reach, but then yours is 4 years younger so yours might be different.