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Old 2008-06-12, 08:00 PM   #12
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Join Date: Apr 2006
Age: 27
Posts: 1,706
The rim is actually 15". Bike rims size are measured as if a 2" wide tire is on them, adding 4" onto the total diameter. So 19" rim is 15", 20" rim is 16", 24" rim is 20", etc. Trials (mod rear) tires for 19" (15") rims are all 20x2.5 making the total diameter of the rim and tire 20". Front rims of trials bikes are 20" (16") rims. Front trials tires (for mod bikes) are all (that I know of) 20x2.0 making the total diameter 20". So don't buy any trials tires that are 20x2.0 if you plan to use it on a 19" (15") rim.
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