Question about Sram 850 8 Speed Cassette 11-32t Mountain Bike

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Bicycle Tires Tube

How do I know which bicycle tires tube my wheels need?

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Look at the side of the tire for a series of numbers

Posted on Nov 05, 2008

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As above but if the numbers are in decimals (26 x 1.1) vs fractions (26 x 1-1/4") you're looking at two different tire standards. The "26's" in this example specify very different rim sizes.

BTW: that number is a loose approximation of the outside diameter of the inflated tire.

Tubes being flexible, you can get away with intermixing them to a degree but tires won't be the same. The second number is an indication of how wide the tire is that it will fit.

Take that "x XX" piece with a grain of salt as it varies widely bewteen tires and manufacturers. One company's 700 x 23(mm) may actually be narrower than another's 700 x 21(mm).

You don't really want to exceed the capacity of the tire to accept the tube when it's inflated so I always aim somewhat to the small side for tubes (they stretch). In fact, to reduce rolling mass you can run smaller or thinner tubes.

Posted on May 03, 2010

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Yes, the information should be on the sidewalls of the tire. Good Luck!

Posted on Jun 11, 2009

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