so I know that the numbers are the ratio of sidewall height to width, but I'm not sure how it works.
my fav tire for the XR has been discontinued and I need to find new ones. one of the ones i'm looking at (because it has such good reviews) comes in sizes just off from what I need
I need a 90/90 front and a 110/90 rear. the tire in question comes in 80/100 front and 110/100 or 120/90 rear.
my question is "assuming i have enough clearance to run a wider tire, would the 120 work better than the 110, and exactly how much wider/taller will the tire be?
also, wshould i even bother trying the 80/100 front?
Quote from: KnightofNi on December 11, 2008, 07:12:45 AM
I need a 90/90 front and a 110/90 rear. the tire in question comes in 80/100 front and 110/100 or 120/90 rear.
my question is "assuming i have enough clearance to run a wider tire, would the 120 work better than the 110, and exactly how much wider/taller will the tire be?
I don't know about handling for that bike, but IIRC, a 90/90 is 90mm wide and 90 x 0.90 = 81mm tall. A 110/90 would be 110mm wide and 110 x 0.9 = 99mm tall, so.....
An 80/100 would be 80mm wide and 80mm tall (10mm narrower - 5mm less on each side, and 1mm shorter than stock)
A 110/100 would be 110mm wide and 110mm tall (20mm wider - 10mm on each side, and 19mm taller than stock)
A 120/90 would be 120mm wide and 108mm tall (10mm wider - 5mm on each side, and 9mm taller than stock)
I believe my math to be correct.
Thanks! [thumbsup]
i figured out the formula...the first number is the width, the second number is the height of the tire represented as a percentage of the first number.
i.e. - a 90/90 would be 90mm wide and the sidewall is 90% of 90mm which is 81mm.
i don't think i want to go to a narrower tire up front. i'll keep that one the same and measure the rear to make sure I have clearance.