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Old 10-17-11, 01:08 PM   #1
lobstermike
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matching mtb tyres to rims?

Hi everyone,
Is using a mavic xm317 rim too narrow for using a 26x2.4 tyre? I ride xc mostly, but i do like to have the extra cushioning of a large tyre up front. What width rim would be the 'ideal' for a 2.4 tyre?
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Old 10-17-11, 01:56 PM   #2
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Scroll about of the way down this page to the cart of tire width vs rim width; make sure that you read the commentary.
http://sheldonbrown.com/tire-sizing.html#width
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Old 10-17-11, 02:08 PM   #3
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Thanks nfmisso, i looked at that chart before i asked the question, and according to that chart a 17mm rim is compatiable with a max size of a 1.7 inch tyre, which seems a bit weird when the stock tyres that were on the wheels were 2.1 inch! I see it says that riders exceed these sizes with no problems, but i was thinking that maybe a 2.4 tyre would be pushing the limits a bit too far?
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Old 10-17-11, 06:57 PM   #4
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The Mavic XM 317 has recommended tyre widths of 1.00" to 2.10"

http://www.mavic.com/en/product/rims...ke/rims/XM-317

Mavic recommends 21mm wide rims for tyre widths of 2.10" to 2.50"

Last edited by cobba; 10-17-11 at 07:05 PM.
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Old 10-18-11, 07:04 AM   #5
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Quote:
Originally Posted by lobstermike View Post
Thanks nfmisso, i looked at that chart before i asked the question, and according to that chart a 17mm rim is compatiable with a max size of a 1.7 inch tyre, which seems a bit weird when the stock tyres that were on the wheels were 2.1 inch! I see it says that riders exceed these sizes with no problems, but i was thinking that maybe a 2.4 tyre would be pushing the limits a bit too far?
Brown's values are for high pressure tires and don't really apply to low pressure wide tires.

Quote:
Originally Posted by cobba View Post
The Mavic XM 317 has recommended tyre widths of 1.00" to 2.10"

http://www.mavic.com/en/product/rims...ke/rims/XM-317

Mavic recommends 21mm wide rims for tyre widths of 2.10" to 2.50"
I run 2.3" on Mavic XC 317 without issue. The recommendations are conservative. That said, be careful of the pressures you run in them. The wider the tire, the higher the total pressure within the tire. That's not the pressure per unit area but the total force on the tire wall. A wider tire is a bit more prone to blowing off the rim in some circumstances.
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