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tire question

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i went to moto one the other day and asked for a Michelin s12 80/100/21 and after getting the original tire off i noticed he gave me a s12 90/90/21, how is this going to perform on my bike, i ride desert? i noticed it looked slimmer, should i take it back?

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From what I understand the Michelin S12 only comes in a 90/90-21 size.

Take a 110/100-18 for example:

The first number (110) is the width of the tire. The second number (100) means 100% of the width = the height. Then 18 is just the rim size. So a 110/90-18 will have a shorter sidewall then a 110/100-18 and so on.

You will be fine.

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Michelin uses a different naming system than the other brands. Their 90/90/21 is actually a little smaller than a regular 80/100. For instance, their 130/90/19 is like a 108/85/19. (motosport.com uses the 'standard' sizing in their item listing. If you order a 110/90/19, you'll get the 130)

They get great traction when they're good, but that's about the only positive I can say for 'em in my experience. On a 19 or 21 inch wheel, riding other than groomed tracks (rocks, roots, etc..) you will probably end up with a dent in your rim. They seem to do OK on 18" wheels- more sidewall.

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