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Tire radius to big for small frame. Suggestions?

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Tire radius to big for small frame. Suggestions?

Old 05-14-15, 07:59 PM
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fujs12s
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Tire radius to big for small frame. Suggestions?

I am currently building up frames for my daughters. One frame is 50 and the other 52.

Wheels: Shimano RS11 Road Wheels


I bought Gatorskins 25mm tires. I had to remove the skewer to get the back wheel on to the bike. There is about 4mm clearance between wheel and the BB shell.

I need to do something different because it will be a hassle to change the tire.

Would changing to a 23mm tire make enough difference, or should I get a different brand of tire??
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Old 05-14-15, 08:35 PM
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79pmooney
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Sounds like the frame is probably not a great one for the job. It sounds like this a racing frame with 700c wheels. Again, it sounds like it was designed to give a racing short wheelbase but keep standard size wheels. Drawback? The rear wheel gets very close to the BB. Does this frame have horizontal dropouts? Sounds like you really want a vertically dropped frame if this is the case. (I raced a bike decades ago with the same issue. Never put clinchers on it and tire sizes were not generally given in those days. Racing sewups were fine. Training sewups I had to force in. There were sewups I could not inflate until the wheel was in frame. (My frame was a 59.)

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Old 05-14-15, 08:36 PM
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Tight clearance between the rear wheel and the seat tube is normal. On my size 50 I can barely squeeze my pinky between the tire and the tube, and that's with 23 mm tires. But I don't see why that would present problems when changing the tire, or why you'd want to remove the skewer.

Thickness differences between 23 and 25 mm are minimal.

Are you sure that you're using correct wheels for the frame? Maybe your frame is designed with 650b wheels in mind?
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Old 05-14-15, 09:04 PM
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You might try different profile tires. Gatorskins are tough, commuter type tires with thicker and tougher treads. More "racing" type tires probably will help.

I once had a bike with steep seat tube and regular used Continental GPs. I brought Performance house brand tires similar to Gatorskins for commuting and I couldn't get the wheel on unless the tire was deflated
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Old 05-14-15, 09:26 PM
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Could that bike have originally come with 26" wheels? How do the brakes line-up with the rims you are using?
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Old 05-15-15, 11:07 AM
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Originally Posted by fujs12s View Post
I am currently building up frames for my daughters. One frame is 50 and the other 52.

Wheels: Shimano RS11 Road Wheels


I bought Gatorskins 25mm tires. I had to remove the skewer to get the back wheel on to the bike. There is about 4mm clearance between wheel and the BB shell.

I need to do something different because it will be a hassle to change the tire.

Would changing to a 23mm tire make enough difference, or should I get a different brand of tire??
If I'm visualizing it right, you're having trouble getting the end of the hub past the RD. It helps to use a finger or two on your right hand to pull the RD cage backward and out of the way while inserting the wheel.

If your daughters are light, then the good news is that 23mm tires ought to be big enough for them. Remember that just because the max pressure on the sidewall may be 120 psi or so, you don't need to inflate them that hard: https://www.bikequarterly.com/images/TireDrop.pdf
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Old 05-17-15, 09:00 PM
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Problem solved.

Able to get a "deflated" tire on much easier.

Thanks for all the suggestions.

D
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