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Wider tires on existing rims.

Old 05-08-20, 05:20 PM
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Helderberg
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Wider tires on existing rims.

I am currently running 700x30c tires on my hybrid and would like to go wider. I have 700x37's on my gravel bike and would like to run the same on my hybrid but the rims are not as wide. on the hybrid. My question, is there a ratio of rim width to maximum tire width? I ask this before I pull the wheel off the rim to measure the internal width so I do not have to do it twice.
Thanks in advance, Frank.
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Old 05-08-20, 05:42 PM
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dsbrantjr
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Here is a guide to tire size vs rim width: https://www.sheldonbrown.com/tire-sizing.html#width note that it is only for guidance and that its suggestions are routinely exceeded with success.
Also, check everywhere for clearance tight spots; on two of my bikes the limit in the rear is the front derailleur mechanism.
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Old 05-08-20, 05:47 PM
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Bill Kapaun
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Typically, outside measurement is about 5mm more than inside.
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Old 05-08-20, 05:49 PM
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Iíll bet youíll be just fine if they fit in the frame
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Old 05-08-20, 05:57 PM
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Yes and no. It is more generous for a hybrid than more aggressive riding. That said, I would never not run a tire because of some chart. You need to ask those who ride in the real world.

Case in point, my main trail bike has 2.1” (53mm) on 14mm (inside width) rims.

Your should know your rim, but in most cases, if a 37mm fits on your bike it should be good.

John
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Old 05-08-20, 09:27 PM
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Originally Posted by dsbrantjr View Post
Here is a guide to tire size vs rim width: https://www.sheldonbrown.com/tire-sizing.html#width note that it is only for guidance and that its suggestions are routinely exceeded with success.
Also, check everywhere for clearance tight spots; on two of my bikes the limit in the rear is the front derailleur mechanism.
I had checked the frame but had not given the FD a thought. Thank you for the heads up.
Frank.
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Old 05-08-20, 09:30 PM
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Thank you all for the information. Much appreciated.
Frank.
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Old 05-09-20, 12:56 AM
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Off the cuff I'd like to see a greater than 17mm internal width for that tire, but realistically any road rim is likely to work OK.
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Old 05-09-20, 08:02 AM
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Helderberg One thing to keep in mind is that BikeForums is very road bike-centric, and the knowledge base tends to skew that way. No offense to any, but thatís how it is.

In the MTB arena, particularly the NORBA era, running 50-52mm (1.95Ē-2.1Ē) tires on 17mm rims was pretty much de rigueur for XC bikes. My old XC race bike lives on 50mm slicks these days as a city bike, so yes, you can run a wider tire on the rims you have.

Saying you need to change rims on your hybrid to run a tire thatís 7mm wider than the one thatís on there now is a little over the top.
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Old 05-09-20, 08:21 AM
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Originally Posted by Ironfish653 View Post
Helderberg One thing to keep in mind is that BikeForums is very road bike-centric, and the knowledge base tends to skew that way. No offense to any, but thatís how it is.

In the MTB arena, particularly the NORBA era, running 50-52mm (1.95Ē-2.1Ē) tires on 17mm rims was pretty much de rigueur for XC bikes. My old XC race bike lives on 50mm slicks these days as a city bike, so yes, you can run a wider tire on the rims you have.

Saying you need to change rims on your hybrid to run a tire thatís 7mm wider than the one thatís on there now is a little over the top.
Thank you, Frank.
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