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I got an 18" x 3.5" wheel and I dont know how to shop for the right tires. I went to coker.com and dont know what all the different variations af numbers and letters mean. Can you guys school me?
 

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well, personally, i'd just call my indie shop and ask him what to do. that, or find out what kinda bike it came from or is going on, and go from there
 

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In the old days, bias ply tires were measured in inches. A standard for many American bikes in the mid century was a 5.00-16, (5" wide for a 16" rim). Now tires are metric with the first numbers the width, in millimeters, followed by the aspect ratio: height to width percentage. Then an alpha, normally the letter "R" for radial, followed by rim size. If that doesnt confuse you they also have alpha designators for size, such as "MT90" would equate to 130/90 which would be pretty close to the original 5.00 tire
 
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