Wild Dog Adventure Riding

Technical Section => Make / Model Specific Discussions => Honda CR / CRF / Africa Twin 1000 => Topic started by: Grappa on March 29, 2015, 06:33:07 pm

Title: Tyre question
Post by: Grappa on March 29, 2015, 06:33:07 pm

Is there any difference between a 90/90 21" and a 3.00 - 21" tyre?

Title: Re: Tyre question
Post by: Mad Matt on May 16, 2015, 12:40:10 pm

3.00-21 is an older inch size standard. +- 3 inches wide with 100 aspect ratio for 21 inch rim. A 90/90-21 is a low profile tire more than 3 inches wide, aspect ratio  90 (sidewall height % of width) for a 21 inch rim.

In other words the 90/90-21 is slightly wider with a lower profile for the same size rim

Title: Re: Tyre question
Post by: Grappa on May 18, 2015, 05:35:21 pm

Many thanx for the info. Based on tyre size conversions I found on the interweb, these two sized tyres are interchangeable.