275/40 20 with 4.30ís. Will this combo work? - Ford Mustang Forum
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post #1 of 4 (permalink) Old 09-11-2006 Thread Starter
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275/40 20 with 4.30ís. Will this combo work?

I looking at buying some 275/40 20 wheels & tires. By the numbers, everything should be fine. Saleen also uses this same wheel and tire combo.

Does anyone have any experience with this wheel/tire combo with 4:30 gears? If so, please let me know your opinions for or against.

Stock: 235/50 18 Rear: 3.55 Dia: 27.25 Speed: 80 RPM: 2364
Mod 1: 275/40 18 Rear: 4.10 Dia: 26.66 Speed: 80 RPM: 2790
Mod 2: 275/40 20 Rear: 4.30 Dia: 28.25 Speed: 80 RPM: 2722

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post #2 of 4 (permalink) Old 09-11-2006
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I would take the time to figure it out, but don't feel like it.
Above is a link posted to the calculators.

Enter in your values.

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post #3 of 4 (permalink) Old 09-11-2006
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I assume you are naturally aspirated? Top end speed with 4.30s is going to drop 15 or more mph. Off the line it's going to be a bat outta hell but your gas mileage will suffer unless you compensate with UD pullies or an electric water pump. If you do any highway driving, 4.30s probably aren't for you.

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post #4 of 4 (permalink) Old 09-12-2006 Thread Starter
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I have the details listed and the RPM's are almost the same for the 4.10's compared to the 4.30's with the wheel and tire diameter differences. I was just hoping that some one is using the 275/40 20 with 4.30's. The numbers add up, I was looking for a testimonial.
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