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Old 07-27-2019, 04:32 PM   #1
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Quick tire size question

Just using my stock 20,s rim's , I'm just goin 1 size up on the tires from stock sizing.....so I'm hearing 255/40/20 front and 285/35/20 rear.....or can the rear be 285/40/20???
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Old 07-27-2019, 04:51 PM   #2
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No the 285/40/20 will be too big in diameter.
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Old 07-27-2019, 04:54 PM   #3
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Originally Posted by Rock-It Man View Post
No the 285/40/20 will be too big in diameter.
285/35/20 it is then!! I honestly want to get some 18 inch trims instead just so I can have thicker meet on the tire!! Not really a big fan on low profile tires
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Old 07-27-2019, 05:24 PM   #4
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I am using 285/40/20 NT05 and have a 1 inch lowering kit. i like the thicker look plus more traction.
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Old 07-27-2019, 05:40 PM   #5
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Originally Posted by BAH2SS View Post
I am using 285/40/20 NT05 and have a 1 inch lowering kit. i like the thicker look plus more traction.
Are you using your stock 20 inch rims?? Is your tire setup 255/40/20 front and 285/40/20 rear??
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Old 07-27-2019, 05:52 PM   #6
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Quote:
Originally Posted by camaro528 View Post
Are you using your stock 20 inch rims?? Is your tire setup 255/40/20 front and 285/40/20 rear??
Yes stock wheels.
Front are factory size, rear using 285/40/20.


EDIT: attachment of how the car sits
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Old 07-27-2019, 06:45 PM   #7
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Old 07-27-2019, 07:07 PM   #8
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Originally Posted by BAH2SS View Post
Yes stock wheels.
Front are factory size, rear using 285/40/20.


EDIT: attachment of how the car sits
Looks real good!! So wait, just to clarify you are using 245/45/20 up front and 285/40/20 on the rear?? I thought most peeps would say the height settings of the would be off or the speed reading would be off......idk again I could be wrong or they cam be wrong lol..
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Old 07-28-2019, 03:40 AM   #9
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Originally Posted by camaro528 View Post
Looks real good!! So wait, just to clarify you are using 245/45/20 up front and 285/40/20 on the rear?? I thought most peeps would say the height settings of the would be off or the speed reading would be off......idk again I could be wrong or they cam be wrong lol..
That is correct, not only tire hight even the width. My car is tuned so i had the tuner fixed the speedometer
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Old 07-28-2019, 07:30 AM   #10
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Originally Posted by camaro528 View Post
Looks real good!! So wait, just to clarify you are using 245/45/20 up front and 285/40/20 on the rear?? I thought most peeps would say the height settings of the would be off or the speed reading would be off......idk again I could be wrong or they cam be wrong lol..
Notice that the 245 wide tires have a 45 aspect ratio and the 285 wide tires have a 40 aspect ratio.

To have matching diameters, the wider tires have to have a lower aspect ratio. The aspect ratio is the sidewall height divided by the tread width.

You can get an explanation this, as well as actual diameters of any tires you are considering, on tirerack.com.
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Old 07-28-2019, 07:50 AM   #11
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Basically you have to be within a inch of the sidewall height to not throw things off and not be too wide or narrow for the tires to fit the rims also.... the lower the number the wider the tire as in 50s narrower than 40s ..etc....

Me Myself I have on order some wheels for my going wider with the wheels being wider than stock as 9" fronts and 10.5 Rears compared to 8" fronts and 9" rears stock. Speedo settings are usually changed for different rear gears...… the tire aspect ratios unless you like driving with codes or changing out damn near everything as in stabilitrac wheel speed sensor stuff....needs to remain with in a inch...… That's what I think... And I am waiting production of these wheels https://www.americanracing.com/produ...24-cross-fire/

Which have to fit correctly the brakes and have about the same this and that, then I can go with 305/ 35/ 20 which should be about 1 1/2 " wider than stock wheels in the back giving me a slightly larger contact patch more as the same a hellcat sports. And I am going to go with summer only type since I will not be driving below 20 degrees versus Pirellis don't even like it below 40 degrees.... https://www.tirerack.com/tires/tires...omCompare1=yes

The combination with the right width and height with the right wheels should make it more sticky to the ground and feel better with still some improved wear over stock Pirellis which suck....LOL and hopefully being a little stickier remove some of the unintended burn out I get from being so high in torque even with 3:45's.... Just my thoughts on what I am going with, and over the Wheels I am running now I should save over 6 lbs per wheel and make more power get to the ground.

That's the best I could find of the wheels I have now online as far as wheel weight I had to go to like amazon for shipping weights or a what have you as things are not readily out there...say like the weight of a wheel you think is cool may be bad for performance...and then pit from lousy chrome, just as I could not find the stock starters torque amount reading everywhere...…. And so you know If I were you I would get my starter from powermaster because …… Header heat stroke happens and your in the heat cooking a starter especially with tracking...… read the reviews it tells about a installion tip and how it performs with more torque than stock ...good luck.

https://www.amazon.com/Powermaster-9...ustomerReviews
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Old 07-28-2019, 10:40 AM   #12
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Quote:
Originally Posted by camaro528 View Post
Looks real good!! So wait, just to clarify you are using 245/45/20 up front and 285/40/20 on the rear?? I thought most peeps would say the height settings of the would be off or the speed reading would be off......idk again I could be wrong or they cam be wrong lol..
There is only a 1% difference in height between a 275/40 and a 285/40.
I believe the ABS/ST will function properly with up to a 5% difference.
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Old 07-28-2019, 12:28 PM   #13
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There is only a 1% difference in height between a 275/40 and a 285/40.
I believe the ABS/ST will function properly with up to a 5% difference.
Check your math.
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Old 07-28-2019, 03:07 PM   #14
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I'll just stick with 255/40/20 front and
285 /35/20rear.......or probably just go back to to stock settings 245 45 20 front and 275 40 20 rear with the stock 20s rim's the car came with
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