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Old 06-05-2012, 03:41 PM   #1
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TV tire sizes

What is the effect of changing the aspect ratio of a tire from 60 to 65.
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Old 06-05-2012, 03:46 PM   #2
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The overall diameter of the tire will get bigger. The 60 and 65 are the height of the sidewall as a percentage of the tire width. A 100mm wide tire would have a 60 mm or 65 mm tall sidewall. 1010tire has a good tool that you can put different size tires in and compare them to each other.
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Old 06-05-2012, 03:50 PM   #3
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I have 275 60 20 on the truck now but can get a great deal on 275 65 20. Any negative effects to go with the different size tire.
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Old 06-05-2012, 03:53 PM   #4
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Here is the math broken down:

For example you have a 285/70-17 tire.

285 * .7 = 199.5
199.5 / 25.4 (to convert to inches) = 7.85
7.85 * 2 (height of sidewall twice) = 15.7
15.7 + 17 (adding sidwalls to wheel size) = 32.7 (diameter of tire)

Hope this helps.
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Old 06-05-2012, 03:57 PM   #5
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Now that I understand the aspect ratio math, will this affect the truck in any way?
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Old 06-05-2012, 03:59 PM   #6
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This will change the final drive of the truck 60 series = 630 revs per mile diameter 32.99 inch, and 65 =610 revs per mile diameter 34.07 inch. You are also over 3% bigger which is the maximum that is recomended (3.17%)
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Old 06-05-2012, 04:11 PM   #7
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So, I shouldn't do it?
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Old 06-05-2012, 04:16 PM   #8
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It will make your speedometer out by 3%, no biggy.
And it will make your truck pull a wee bit harder with the camper, but again 3% should not be a deal-breaker.
On the positive side, you may get slightly better gas milage (non-towing)as your motor will be turning fewer revs.
You have the hemi, I assume?
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Old 06-05-2012, 04:19 PM   #9
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Quote:
Originally Posted by DonG View Post
It will make your speedometer out by 3%, no biggy.
And it will make your truck pull a wee bit harder with the camper, but again 3% should not be a deal-breaker.
On the positive side, you may get slightly better gas milage (non-towing)as your motor will be turning fewer revs.
You have the hemi, I assume?

I have the hemi. I am motivated by the good price on a set of Michelins.
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Old 06-05-2012, 04:21 PM   #10
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You won't notice the difference and I would bet the truck did not come with either the tires you have now or the ones you are contemplating. Look in the manual for the size that came on the truck originally.
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