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Old 09-20-2014, 01:45 AM   #1
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Tire size - torque ratio

Hey guys.

Was running 215/65/17 wheels on my 2013 V6 and have been thinking of Switching them out to 255/40/19...

What di you think ? Which one is batter torque/power ?

Thanks

Diego


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Old 09-20-2014, 08:20 AM   #2
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The 255/40/19s are 0.97" shorter than the 215/65/17s, essentially gearing your car down.

The 255s will also have better handling and steering feel.
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Old 09-20-2014, 08:23 AM   #3
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Whatever you do, don't try to put wide 28" tall tires up front...
I did that, and i rubbed

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Old 09-23-2014, 01:41 PM   #4
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Cool thanks, that's what I figured...smaller circumference should lead to better torque...theoretically...
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Old 09-23-2014, 02:04 PM   #5
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it does, its just incredibly marginal, less than .1 difference in the effective gear ratio. A 28" tire on a 3.31 car is basically the same as a 27" tire on a like... 3.23 geared car.
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Old 09-23-2014, 03:01 PM   #6
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Yeah, there are online calculators. I'm going from a 245/45/19 to a 255/40/19 and the difference makes it equal to going from a 2.73 gear to a 2.80.

Not much of a difference.
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Old 09-23-2014, 04:02 PM   #7
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So the smaller the sidewall the bigger the gear ratio?

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Old 09-23-2014, 04:33 PM   #8
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Just to avoid confusion, the shorter the tire, the higher the gear ratio. The sidewall is an aspect ratio, not a set length, so its possible for say a 295 35 19 to be taller than a 245 40 19. Make sense?

^^ I didnt bother pulling up a calculator so those numbers are literally just pulled out of my ***, I'm sure someone could check the math, but my point remains the same.
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Old 09-23-2014, 04:35 PM   #9
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Right. It's the overall diameter of the tire. Not the sidewall.
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Old 09-23-2014, 04:48 PM   #10
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And the overall smaller diameter, gives you more torque...so a 255/40/19 has more torque than a 215/65/17...
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Old 09-23-2014, 04:56 PM   #11
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Quote:
Originally Posted by grom80 View Post
And the overall smaller diameter, gives you more torque...so a 255/40/19 has more torque than a 215/65/17...

You got it.

The 255/40/19 is 0.97" shorter than the 215/65/17.
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Old 09-23-2014, 05:10 PM   #12
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Can u post what calculator ur useing

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Old 09-23-2014, 05:12 PM   #13
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Old 09-23-2014, 05:13 PM   #14
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Quote:
Originally Posted by 14mustang v6 View Post
What about going from a 235/50/18 to a 275/35/20?

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---------- Post added at 05:12 PM ---------- Previous post was at 05:11 PM ----------

I have 3.73s

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Old 09-23-2014, 05:16 PM   #15
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Sorry app is glitching but yea I have 235/50/18 on all four tires and I want to put 255/35/20 front and 275/35/20 back.. I have 3.73s what would the gear ratio be then

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Old 09-23-2014, 05:21 PM   #16
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Should be the exact same, your current tires are 27.25" and the 20s will be 27.5". Thats a difference of treawear. I dont have one for effective gear ratios i use, but you can just google tire height calculator, and any will do.
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