When to get some new tyres on sunday, 26 inch 1 3/8 road tyres, went to fit them, and they didn't god knows how we got it on, but the people at halfords had to cut it off. this baffles me because the tyre that came off is a 26 x 1 1/4, so in theory I had an 8th of an inch to play with. Now I'm no mathmetician but this doesn't make sense to me. The bike is from the 70's so the only possible explanation is the tyre sizing has changed maybe? Any ideas?