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An old MTB will have used 26" wheels (559mm rims), you want to put 700c (662mm) rims on it with smaller tires. We can work out wheel approximate diameters. Assuming tire height above the rim is about the same as its nominal width and the MTB frame will take a 50mm tire. 559/2 + 50 = 329mm 622/2 + 28 = 339mm (+10mm) The 700c tire might fit but bear in ...


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@GregoryLeo another side-thought is gearing changes. Some assumptions - the bike is a 48/38/28 triple, with an 11-32 cassette (number of gears is irrelevant here) and I've assumed a 559-54 tyre, so ~54mm wide. 48 38 28 tooth chainring 11 113.2 89.6 66.0 12 103.8 82.1 60.5 14 88.9 70.4 51.9 16 77.8 61.6 45.4 18 69.2 ...


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