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Old 04-12-2004, 07:51 PM
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Bigger tire size decrease acceleration?

Hey, Not to long ago I had the rear tires on my car replaced with a little bit taller/wider of a tire. Scence then it seems like my car has not had as not as good acceleration from a stand still. I was wondering if im going crazy or it this bigger tire selection in back has caused this.
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Old 04-12-2004, 07:53 PM
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You're right. The taller tire slightly increases the effective gear ratio.
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Old 04-13-2004, 04:32 PM
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tires

wow if it is that noticable on a street car you must of really went with a bigger tire or have some really numerically low gears
Jesse
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Old 04-15-2004, 07:28 PM
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I went from a 24" tall tire to a 28" inch tire and yes, without a doubt raised the gear ratio and also of course hurting acceleration.


Think about it, you have a bigger tire that will rotate less per distance traveled. Think about it in big terms, what if the tire was 10 feet tall, it would take a while to make a full revolution thereby raising your final gear ratio.
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Old 04-15-2004, 11:15 PM
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My freeway gear cars are the 427 Impala and the Monte. 3.07s for the Imp and 3.08s for the Monte. And, I have 275/60s on the rear. The other extreme was the 69 396 Chevelle I had with 4.56s in the rear. The car had 26 inch tall tires on it when I bought it....Jeez.....I drove it home from Ghettojets town doing 45 the whole way.....ughh.....I later put 275/60s on, but it didn't help much. That car was great in town....Even though I only used 2nd and 4th in the Muncie!
The other Chevelle has 3.31s.... Both 79 Z-28s had 3.42s...
The 67 Camaro I had was an open who knows what? and later a buddy and I put 4.11s in it!
Oh...forgot about the 69 Chivy C-20 I used to own....4.88s......
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