Weird Tire Size in Rear

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GummyGrip
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Weird Tire Size in Rear

Post by GummyGrip »

Just purchased an 01 KDX220 a few months ago and the rear tire is trashed. I did some research on the forums about size and brand and most people recommend a 110/100/18. I currently have a 140/80/18 mounted from the previous order and according to these forums, that should be impossible. So now I'm thinking maybe it is a different size wheel? What do you guys think? Go ahead and get a 110/100/18 and I should be fine?

Thanks for any input!
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Mr. Wibbens
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Post by Mr. Wibbens »

a trashed 140/80/18 might fit fine

doubt a new one will though
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skythrasher
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Post by skythrasher »

An 80 or 90 aspect ratio tire is measured from the outside of the nobs instead of sidewall to sidewall like the 100 aspect ratio tire is. This makes a 140/80-18 approx the same as a 120/100-18. I agree with Wibbs a wore out 140/80 tire would fit no problem. I think you could probably find a 140/80 tire with a nob pattern that would clear but it would be the exception clearance wise.
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Post by Mr. Wibbens »

I run a 120/80/18 M5B on my KDX

I compared it with a 130/80/18 M5B

Both off the rim, side by side the 130 was probably 1.5 - 2" taller
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Post by skythrasher »

I don't know how accurate a comparison as such would be. One would have to be carefull to make sure that the sidewalls were equally compressed or that could cause a difference in height. I however ran into a similar thing when I replaced the rear stock tire on my daughters XR80 with a cheap Cheng Shin C755. The tire was marked as exactly the same size however the knobs were so much taller I had to add a link to the chain and use up most of the chain adjustment. Width was not a problem.
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