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Old 08-25-12, 07:18 PM   #1
Chris W. 
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Max tire size for an 85 Trek 520???

Long term back burner project coming to fruition...This was the first year with the the cast livable and a sportier geometry. So the question is, what size tire can I fit with, and without fenders? I'm thinking 25 and 28? Thanks!

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Old 08-26-12, 04:21 AM   #2
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Hi Chris, I can't believe none of the Trek fans chimed in on this yet. I would suspect a x28 road tire would be no problem with or without. If your frendly with your local shop maybe they will let you experiment with some tires.
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Old 08-26-12, 04:33 AM   #3
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When building up my 1983 Trek 620 (which I've heard has ampler room than later years) I was amazed that 28mm tires barely fit under 45mm fenders.
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Old 08-26-12, 05:18 AM   #4
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Max tire size for an 85 Trek 520???

My 2006 Trek 520 came with 32-622 tires and could have accommodated 35-622 without any problems, even with fenders attached.
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Old 08-26-12, 05:43 AM   #5
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If your '85 Trek has long reach caliper brakes, a size 700x28 may be the largest you can fit with fenders.

If your '85 Trek has cantilever brakes, a size 700x32 should fit with fenders.

Considering that the 1985 Trek touring bikes came with 27x1.25 tires, fitting a 700x32 should not be a problem.
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Old 08-26-12, 10:42 AM   #6
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Thanks a bunch folks! This is the 520 with Shimano 600 long reach brakes. It will probably end up with 25mm tires with 37mm fenders.

Cheers,
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Old 08-26-12, 11:10 AM   #7
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Quote:
Originally Posted by Barrettscv View Post
If your '85 Trek has long reach caliper brakes, a size 700x28 may be the largest you can fit with fenders.

If your '85 Trek has cantilever brakes, a size 700x32 should fit with fenders.

Considering that the 1985 Trek touring bikes came with 27x1.25 tires, fitting a 700x32 should not be a problem.

1985 Trek 520 came with 700-25 tires. I was surprised it did not have 27s, and side pull brakes. Specs changed almost every year, in 1985, the 520 was considered a "sport touring" model, while the 620 and 720 were the touring models they both came with 27 x 1 1/4 tires).

Meanwhile, the 1984 Trek 520 was in their touring catalog, had canti brakes, 27 inch wheels, etc. Odd move.
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Old 08-26-12, 11:16 AM   #8
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Gonna say 32mm w/ fenders 35 without.
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