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Author Topic: Tire size conversions?  (Read 2784 times)

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Offline wildrum88

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Tire size conversions?
« on: March 14, 2012, 07:24:58 PM »
Hey y'all just wondering what, if any tire size substitutions are possible. For example, on my '82 cb650, the manual suggests 120/90-17 for the rear, but as of now I'm running a 130/90-17. Is it possible to do a 140/80-17? the reason I'm asking is because i can't find ANY white walls in 120/90-17. also what do these numbers mean anyway? most of the time its like 4.50h17-4pr or something.
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Offline nayto550

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Re: Tire size conversions?
« Reply #1 on: March 14, 2012, 07:46:11 PM »
I'm not familiar with the clearances on that bike, but here's a page that should help you out.  Just skip down to the "conversion charts" and "size types" sections.

Motorcycle Tire School
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Offline LesterPiglet

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Re: Tire size conversions?
« Reply #2 on: March 14, 2012, 07:52:48 PM »
They are Metric sizes. You will get the hang of it eventually. :)
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Offline Stev-o

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Re: Tire size conversions?
« Reply #3 on: March 14, 2012, 08:22:48 PM »
Study that website linked above,that will answer your questions.
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Offline wildrum88

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Re: Tire size conversions?
« Reply #4 on: March 14, 2012, 08:34:46 PM »
The website is definitely helpful, i suppose ill just have to measure the clearance when theres some light outside. if the aspect ratio is 80% that means the tire's cross-sectional width is 80% of its height correct? and for the 140/80-17, it says 140/80-----5.50/6.00 meaning the 5.50 is the minimum width and the 6.00 is the maximum width (when inflated)? I'm thinking of getting these white walls http://www.phatperformanceparts.com/ProductDetails.asp?ProductCode=SHINKO%2D777&CartID= in a 140/80-17, but it says this is a front tire, is it possible to use a front tire as a rear? thanks for the help
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