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Tire Talk, Chain & Sprockets If it has to do with tires & wheels, then you're in the right place.
Best tire for a Katana? What's the tread life on a particular brand ? Size of a stock rim?
Chains & Sprockets? These questions and so much more are addressed right here !

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Old 05-27-2009, 08:32 PM   #1
arsenic
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Default tire sizes - what they mean

ok, in a recent post involving someone using a 160/70 rear tire. It struck my that you guys need to know how tire sizes work. Just because the front is a 120/70, if the rear is a 160/70 that DOES NOT mean they are the same profile, quite different in fact. Let's use a 160/60ZR17 for an example (this is the same for EVERY tire size).
160 - the width of the tread in millimeters, in this case 160mm
60 - the ASPECT RATIO that means the sidewall height is 60% of 160mm or in this case 96mm.
Z - the speed rating
R17 - Rim size in inches, in this case 17" rim.
so that is how it works.

Last edited by arsenic; 05-27-2009 at 08:37 PM..
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Old 05-27-2009, 09:04 PM   #2
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Don't forget that a 160 from Metzeler will not be the same width or height as a 160 from Dunlop either. The best way to check tire sizes is measure them. The sidewall info is just a reference.

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Old 05-28-2009, 02:50 AM   #3
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The "R" actually stands for Radial also. A bias ply tire won't have the "R" in the size designation.
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Old 05-28-2009, 07:06 AM   #4
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there not exactly the same cause they have a certain % of diff they can play with.....
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Old 05-29-2009, 03:47 AM   #5
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this post was made simply so members can have an idea of what they mean. Just because the front is a 120/70. Making the rear a 160/70 DOSE NOT make them any better. I just wanted to let members know what the sizes mean.
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Old 05-29-2009, 03:50 PM   #6
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so now how big of a tire can I fit on my Kat?
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Old 05-30-2009, 03:31 AM   #7
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thanks for the info arsenic! could you give some examples how the aspect ratio affects handling?
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Old 05-30-2009, 08:05 AM   #8
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Taller sidewalls absorb more bumps and roughness, giving the feeling of a "smoother" ride. They also flex more on the curves, giving a less than secure feeling on the turns in performance aspects.

Shorter sidewalls generally means more "feeling" of the road... every bump. Less flex on the curves give better feeling on high speed turns.

Over generalization, but that is about the basics of it.

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Old 06-09-2009, 03:37 AM   #9
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Quote:
Originally Posted by Kreylyn View Post
Taller sidewalls absorb more bumps and roughness, giving the feeling of a "smoother" ride. They also flex more on the curves, giving a less than secure feeling on the turns in performance aspects.

Shorter sidewalls generally means more "feeling" of the road... every bump. Less flex on the curves give better feeling on high speed turns.

Over generalization, but that is about the basics of it.

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what he said
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Old 06-09-2009, 07:10 AM   #10
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Assuming the same wheel size and overall tire height, a tire with a lower aspect ration (wider same height same sidewall) will also tend to move more or squirm, since the tire isn't supported as well as it would be on a wider wheel. In a hard turn, the tire will actually roll over a little bit, and it feels like riding a bike with low air in the tires.
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