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I have a 1500 vulcan A and have the stock tires on it Front 100/90-19 and the rear 150/90-15" whats the widest tire I can go on it with my rims?

any suggestions?
 

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Usually up 1-2 sizes in width is the limit, but you should also go down a size or 2 in the sidewall. the 1st number is width in mm, the 2nd is a ratio of the width to sidewall in percentage. The following link lets you compare different sizes. For the rear, a 170/80/15 would be about the limit I would think. You can take the difference and devide by 1/2 and make sure you have that much plus at least a 1/4" clearance at the tightest point, frame, chain guard or any other close point on your current tire.
http://www.tacomaworld.com/forum/tirecalc.php
 
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