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Ram Guru
- Joined
- Feb 1, 2021
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I must have messed up the math. I converted the 65mm sidewalls of the stock tires then x2 for top and bottom and added it to the 18” rims which equals 23.118”. I did the same with the 55mm sidewalls of the new tires and added it to the new 20” rim and got 24.33. Resulting in the new height being 1.212” taller. Is this not correct? I’m awful at math so feel feee to correct me.
The 55 and 65 are aspect ratio.
Width versus sidewall height.
Take your width multiply by the aspect ratio to get a sidewall dimension.
Convert to inches.
Rim diameter plus sidewall plus sidewall = tire diameter.
275/65/18
285*0.65= 178.75mm = 7.03"
18+7.03+7.03= 32.06"
275/55/20
275*0.55= 151.25mm = 5.95"
20+5.95+5.95= 31.9"