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Intalling fatter tires on skinnier wheels

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Intalling fatter tires on skinnier wheels

Old 04-08-17, 11:16 PM
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curbowman
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Intalling fatter tires on skinnier wheels

I have a set of new 630 x 32 clincher tires. Could they be installed on rims that are 20 mm wide?

Last edited by curbowman; 04-08-17 at 11:18 PM. Reason: Spelling mistake
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Old 04-08-17, 11:24 PM
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Originally Posted by curbowman View Post
I have a set of new 630 x 32 clincher tires. Could they be installed on rims that are 20 mm wide?
You should always specify whether the "width" you're referring to is inner or outer. Inner width affects how the tire seats, outer width is useful when discussing brake adjustment or aerodynamics.

But, it'll probably work fine either way.
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Old 04-09-17, 07:22 AM
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Originally Posted by curbowman View Post
I have a set of new 630 x 32 clincher tires. Could they be installed on rims that are 20 mm wide?
My Specialized Crosstrail Sport came with 700C x 45mm tires on 23mm rims. That's measured from the outside of the rim.
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Old 04-09-17, 07:22 AM
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Should be no problem. I run 37mm tires on 18mm wide rims on one of my bikes.
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Old 04-09-17, 07:50 AM
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The rim is 20 mm wide outside and 13 mm inside. I did a test fit without the air tube and the tire was much more difficult to install than on the usual 1 1/4 rim. I'm concerned I might damage the tire.
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Old 04-09-17, 10:51 AM
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The 630x32 is essentially the same as a 27 x 1 1/4

a 1 1/4 tire ~= 32mm

1.25" x 25.4 = 31.75mm



There's more variation than that from tire to tire within the same manufacturer.

People have gone further than that - it may be more difficult to mount, but should be possible.

Last edited by Viich; 04-09-17 at 10:52 AM. Reason: premature posting
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Old 04-09-17, 02:54 PM
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Thanks for all your replies! Now I know what to do. Around here everybody and their sister have modern mountain bikes, so a vintage road one is way off the charts.
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Old 04-09-17, 03:16 PM
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I can't provide any personal experience, but you can find a nice chart if you google: "Tire Sizing Systems sheldon brown" (I can't post links since I am a newbie on forum :-( )

According to that chart, on 13mm rims you can go safely up to 25mm; above that you risk: "If you use a very wide tire on a narrow rim, you risk sidewall or rim failure. This combination causes very sloppy handling at low speeds."
The site also has this disclaimer: "Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem."
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Old 04-09-17, 05:48 PM
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Originally Posted by curbowman View Post
I have a set of new 630 x 32 clincher tires. Could they be installed on rims that are 20 mm wide?
I don't see why not. I run 55mm tires on 17mm internal width tires regularly.

Originally Posted by georgeav View Post
I can't provide any personal experience, but you can find a nice chart if you google: "Tire Sizing Systems sheldon brown" (I can't post links since I am a newbie on forum :-( )

According to that chart, on 13mm rims you can go safely up to 25mm; above that you risk: "If you use a very wide tire on a narrow rim, you risk sidewall or rim failure. This combination causes very sloppy handling at low speeds."
The site also has this disclaimer: "Note: This chart may err a bit on the side of caution. Many cyclists exceed the recommended widths with no problem."
The chart you are referring to is more than just a little bit conservative. It's so conservative as to be mostly useless. It useless enough in my opinion that I'm loath to add the link but there it is.

For example, I have Velocity Deep-Vs on a bike with 37mm tires on it. According to the chart, I shouldn't run anything wider than a 28mm tire on it The chart says that is a no-no.

I have the aforementioned 17mm rims with 55 mm tires which the chart says that I should use at least a 25mm rim. I refuse to run that heavy a wheel even for mountain biking because years of experience with narrow cross country rims and wide tires have never caused me any issues. I opt for the weight savings.
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