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Tire Size?

Old 07-29-12, 09:16 PM
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Tire Size?

I have a mid 80s Schwinn Le Tour and the rims say 27 x 1 1/4 but the tires that are on it now look like they are thinner than my wife's bike tires which I can read the side walls that say 27 x 1 1/4. I am looking to replace the tires should I look for 27 x 1 1/4 or try and measure the width of what is on mine now. I am very new to road biking and not sure what I can and can not do. Thanks for any help!
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Old 07-29-12, 09:35 PM
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Just get some 27x1-1/4 and you'll be fine.
You could even use 27x1-1/8 or 27X1" if you want a skinnier tire and can find them.

IF it's an older bike with straight wall rims, get a tire with a wire bead vs Kevlar.

Here's a source for all 3 sizes

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Old 07-29-12, 10:46 PM
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The nominal size, ie. 27x 1-1/4, often is only an approximation of the actual size, and tires with the same nominal size vary through a fairly large range. Often the larger version of a supposedly narrower tire will be bigger.

The ISO designation molded into the tire near the rim line is more accurate. Your tire is probably marked 32-630, where the numbers represent the metric equivalents. The 32 is the width, and the 630 the diameter at the rim. Like with car tires, you can use a range of widths as long as the rim diameter matches, so you want a xx-630 tire. Remember that even the ISO widths are only approximations, so don't take them as Gospel.
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