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How wide a tire is to wide on old roadbike ?

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How wide a tire is to wide on old roadbike ?

Old 11-30-14, 10:19 AM
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How wide a tire is to wide on old roadbike ?

Bought a roadbike from 1980 and I am playing around with ways of setting it up. By taking out the adjustment screws in the rear dropout I can get in 33 mm tires if they are not inflated as they go in. There is barely room for 33 mm up front as well (these are the tires I have lying around). How much room do you need up to the brakes for this to work ? This would be a strictly townie/gravelroads on a sunny day bike, any kind of mud/clay would of course make things rather difficult..
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Old 11-30-14, 11:58 AM
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Are the brakes installed?

I'm using tires that measure between 29 and 31mm on my vintage bikes. These tires fit bikes that use medium beach caliper brakes or that use center-pull brakes. I find that with 32mm tires or larger, won't provide enough clearance for any mud or wheel rim misalignment.

Challenge Parigi-Roubaix, Challenge Almonzo and Compass Barlow Pass tires all measure in the 30.0 to 31mm range.
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Old 11-30-14, 12:11 PM
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This bike is an Italianmade frame for the Norwegian market (a DBS Professionale, all DA EX). I have had a DBS 531 frame from the sixties that easily handled Nokian W106. This one is not that roomy but there is probably a little less than 1 cm between the top of the tire and the underside of the brake. I wonder if that will cause problems even on dry hardpack.
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Old 11-30-14, 12:23 PM
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Originally Posted by plodderslusk
This bike is an Italianmade frame for the Norwegian market (a DBS Professionale, all DA EX). I have had a DBS 531 frame from the sixties that easily handled Nokian W106. This one is not that roomy but there is probably a little less than 1 cm between the top of the tire and the underside of the brake. I wonder if that will cause problems even on dry hardpack.
I had a bike that also had a very tight fit under the brakes. The only issue I had was the tire occasionally rubbing. After some use I changed to a smaller tire. It never caused a problem, but I didn't like the risk of the front wheel locking, due to debris caught in the tight space between the tire and the brakes.

If this happens at the back wheel, the bikes gradually stops. If this happens at the front, it could be far worse.

I have heard of mechanics adding a little filler to the dropouts, to add a little clearance. You might also transplant a fork from a bike with 27 inch (630) wheels.
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Old 11-30-14, 01:38 PM
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I have an old 80s steel italian bike and putting on 28s instead if the 23 s I road today..It might take a larger tire but 28 should do the trick.
found a cheapo pair on Nashbar $13.00
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Old 11-30-14, 02:23 PM
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1 cm is a HUGE clearance by today's standard. 3mm all around would be a decent minimum in dry conditions, but carry a spoke wrench. 1 cm radial clearance is small for fenders because they are more likely to jamb with debris and collapse than a frame or brake.
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Old 11-30-14, 02:34 PM
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Originally Posted by catgita
1 cm is a HUGE clearance by today's standard.
I'm assuming he means 1mm.
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