Originally Posted by
Chr0m0ly
I have some ‘83 and ‘84 Trek tourers, but they come from the pre-fastback seat stay stay era, so I don’t think that info would be helpful.
They all fit, at minimum, 28mm tires with fenders. I would speculate the ‘87 model year would be the same, and I’d imagine by ‘87 they would allow for a 32 with fenders, but I don’t have any treks newer than ‘84.
The brochure specs 27 1 1/4 tires, which are roughly 32mm wide, so I think you’ll be good.
Actually 1 ¼ is pretty much exactly 32 mm. The lateral clearance with 27 x 1 ¼ should be real good, but the radial is at least 4 mm less. If you have 622 x 32 and 630 x 32 the widths will be the same but the radial clearance is 4 mm less. Worse for 35 mm or 38 mm tires. Will they rub? I don't know.
I would totally agree it will fit 622 x 28 with 45 mm fenders, and most likely 32 mm tires as well; my Trek will fit 31 mm nicely. Not sure about 630 (27") x 28. The opinions about radial clearance are quite varied, and it might be the reality is, as well.