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TxDoc · January 5, 2003

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Speedo converter

Find new Gear Ratio with new tire size

Find Overall Crawl Ratio

Find MPH

Find RPM

Convert P-Metric tire to Tire Diameter inches

timk49 · January 6, 2003

Hi Txdoc

I used the calculator to check what my gear ratio would be when I change my stock tires 245 / 75R /16 I'm thinking they are about 30" tires. If I enter 33" for 285/75R16 as the new tires it says my gear ratio changes fron 4:10 to 4:53 Is that possible. I was thinking the cahnge in ratio would go the other way.

k1500chevy97 · January 6, 2003

Good site .

Now I actually know how much my speedo is off by these taller tires (235/85/16)

Shaners · January 6, 2003

Hi Txdoc
I used the calculator to check what my gear ratio would be when I change my stock tires 245 / 75R /16 I'm thinking they are about 30" tires. If I enter 33" for 285/75R16 as the new tires it says my gear ratio changes fron 4:10 to 4:53 Is that possible. I was thinking the cahnge in ratio would go the other way.

I would think your gear ratio should change the other way too...