Wide tires - Chevy SSR Forum
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post #1 of 7 (permalink) Old 04-12-2019, 07:10 PM Thread Starter
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My SSR:
05 redline auto 23k
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Wide tires

Having my 315's mounted. Da__ these tires are wide. For the folks that are running them, how much do they throw the odometer off? Now to really put some fuel on the fire, my fuel mileage will_______.?
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post #2 of 7 (permalink) Old 04-12-2019, 10:50 PM
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My SSR:
#118755, DOB 12/2/04, 2005, 6 spd, smokin asphalt, boards, bed carpet, gauges, purchased June, 2013
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Here’s what you can expect for the difference between stock and 315s at 2,000 rpm:
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post #3 of 7 (permalink) Old 04-13-2019, 02:37 AM Thread Starter
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Originally Posted by TruckNRod View Post
Hereís what you can expect for the difference between stock and 315s at 2,000 rpm:
Thanks, Robert
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post #4 of 7 (permalink) Old 04-13-2019, 06:44 AM
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My SSR:
Red 2005 with 1SB package, chrome wheels, gauge pkg and carpeted bed.
This can be confusing! I am running Nexan Roadian 295/45-20s.

There seems to be three way to calculate the difference and the results don't agree with each other.

Overall diameter: RSA - 29.3 vs. Nexan - 30.5, correction factor of .040956.

Revs per mile: RSA - 714 vs. Nexan - 681, correction factor of .040956.

MPH: RSA - 65 vs. Nexan - 67.58, correction factor of .039692.

The tire ODs, Revs per mile and MPH were obtained from the respective manufacturers websites. I choose to use the MPH correction factor because it's the most conservative. I am open to other opinions, since I am just using my best guess.

One last point. I think I addressed this issue when we discussed tire diameter a while back. I know that it's not statistically appropriate to use 6 decimal places for a correction factor when part of the data is constrained to using 1 decimal place. I just do it for fun!

Tim
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post #5 of 7 (permalink) Old 04-13-2019, 08:50 AM
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My SSR:
#118755, DOB 12/2/04, 2005, 6 spd, smokin asphalt, boards, bed carpet, gauges, purchased June, 2013
Garage
Quote:
Originally Posted by BRG Tim View Post
This can be confusing! I am running Nexan Roadian 295/45-20s.

There seems to be three way to calculate the difference and the results don't agree with each other.

Overall diameter: RSA - 29.3 vs. Nexan - 30.5, correction factor of .040956.

Revs per mile: RSA - 714 vs. Nexan - 681, correction factor of .040956.

MPH: RSA - 65 vs. Nexan - 67.58, correction factor of .039692.

The tire ODs, Revs per mile and MPH were obtained from the respective manufacturers websites. I choose to use the MPH correction factor because it's the most conservative. I am open to other opinions, since I am just using my best guess.

One last point. I think I addressed this issue when we discussed tire diameter a while back. I know that it's not statistically appropriate to use 6 decimal places for a correction factor when part of the data is constrained to using 1 decimal place. I just do it for fun!

Tim
295/45-20s at 2000 rpm:
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post #6 of 7 (permalink) Old 04-13-2019, 08:13 PM
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My SSR:
Red 2005 with 1SB package, chrome wheels, gauge pkg and carpeted bed.
Thanks for the data! I just printed it out.
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post #7 of 7 (permalink) Old 04-13-2019, 08:25 PM
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My SSR:
Red 2005 with 1SB package, chrome wheels, gauge pkg and carpeted bed.
Oh Oh!

Just noticed an error. Revs per Mile correction factor should be .048458 NOT .040956!
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