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How will tire diameter affect gear ratio???

This is a discussion on How will tire diameter affect gear ratio??? within the Automatic Transmission forums, part of the Drivetrain category; I've got a question, I'm going to buy BFG drag radials for my 98 TA A4 with 2.73 gears. I ...

  1. #1
    Member 98ls1blackbird's Avatar
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    How will tire diameter affect gear ratio???

    I've got a question, I'm going to buy BFG drag radials for my 98 TA A4 with 2.73 gears. I see they make a 205-40-17 that is 23.5 inches in diameter. I want a shorter tire to help out the 2.73 gear a little. How will that change the effective ratio campared to a 26.1 inch diameter of a stock size tire. I don't know how to figure it out. Having a brain fart I guess. Any help is appreciated. Thanks.
    John
    Last edited by 98ls1blackbird; 04-06-2006 at 07:29 PM.

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    Veteran 0rion's Avatar
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    Not sure how accurate it is but I found a calculator that said you're new actual ratio would be 3.03.

    I'm pretty sure the calc is ( old tire/new tire)*axle ratio= new ratio so 3.03 would be accurate but like I said, I'm not positive.

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    Member 98ls1blackbird's Avatar
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    Thanks, thats the info that info I was looking for.

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