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Originally Posted by sp3nis
Ya I knew the taller tire helps, i just didnt know how much an inch does. Or how Tall our tires are from ford. I know top of 4th is where you want to be, so instead of checkng out what mph top of 5th what they did. (because they were checking the topend lose) i checked out 4th. You fixed up what i wanted to say about 4.30s and 4.56s being more of a non power adder gear. I didnt mean you cant daily a car with 4.30s i checked out 5th gear at a bunch of different mphs to show more rpms. But i did make it sound like that, sorry.
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a 28" tire vs a 26" tire will be the rough equivalent of going down 1-2 steps... with 4.30s it's more like 3.90s if i'm not mistaking.
too lazy to do it now, but here, you can use this, find a 28" tire size, and plug it into the first calculator:
http://www.miata.net/garage/tirecalc.html