Will a 120/90-V18 rear tire fit my bike?

[ilovemountains]

Hi guys, I just ordered a new rear tire but I think I may have ordered the wrong size. I ordered an Avon Super Venom 120/90-V18.. My bike is an XS400D, do you think it will fit or do you think I need to cancel the order? I was going to buy the 110/90 but thought I could fit a little wider tire in my rear end but now I’m not sure! There really isn’t that much difference in the 2 tires according to Avons site. Please let me know what you all think! Thanks again, Matt

[jetmechmarty]

The 1st number is the width of the tire in millimeters. That means the 120 is 10 millimeters wider than the 110. This number is not very accurate, but will get you close.

The second number is the aspect ratio of the tire. In this case, the tire sidewall is 90% as tall as the tire is wide. Therefore, the 120 tire should be slightly larger in diameter than than the 110.

I hope this helps.