Tire mfg recom. 235's with 8.5 rim?
02-26-2004, 11:19 AM
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Re: Tire mfg recom. 235's with 8.5 rim?
Originally posted by Skeedatl
-nm- said screw it and got 245's.
-nm- said screw it and got 245's.
02-26-2004, 11:45 AM
#3
I had mine test fit after reading all the mfg specs and seeing they all recommended 235 for the 8.5" rim. After seeing both on the car, 245's was a no brainer. The 235's looks like rubberbands and have real bad crowning (rim stuck out beyond the tire). The tire mounter also said seating the bead on the 235 is troublesome on the 8.5" tire.
02-26-2004, 11:55 AM
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Originally posted by Skeedatl
I had mine test fit after reading all the mfg specs and seeing they all recommended 235 for the 8.5" rim. After seeing both on the car, 245's was a no brainer. The 235's looks like rubberbands and have real bad crowning (rim stuck out beyond the tire). The tire mounter also said seating the bead on the 235 is troublesome on the 8.5" tire.
I had mine test fit after reading all the mfg specs and seeing they all recommended 235 for the 8.5" rim. After seeing both on the car, 245's was a no brainer. The 235's looks like rubberbands and have real bad crowning (rim stuck out beyond the tire). The tire mounter also said seating the bead on the 235 is troublesome on the 8.5" tire.
02-26-2004, 02:26 PM
#5
What diameter?
With stock being 235/45-17
245/40-18 is 1.5% too slow, aka when the speedo says 60 you're going 60.9
245/40-19 is 5.5% too slow, aka when the speedo says 60 you're going 63.3.
My setup, 245/35-19 is 1.7% too slow so when my speedo says 60, I'm actually going 61.
With stock being 235/45-17
245/40-18 is 1.5% too slow, aka when the speedo says 60 you're going 60.9
245/40-19 is 5.5% too slow, aka when the speedo says 60 you're going 63.3.
My setup, 245/35-19 is 1.7% too slow so when my speedo says 60, I'm actually going 61.
02-26-2004, 03:03 PM
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Originally posted by Skeedatl
What diameter?
With stock being 235/45-17
245/40-18 is 1.5% too slow, aka when the speedo says 60 you're going 60.9
245/40-19 is 5.5% too slow, aka when the speedo says 60 you're going 63.3.
My setup, 245/35-19 is 1.7% too slow so when my speedo says 60, I'm actually going 61.
What diameter?
With stock being 235/45-17
245/40-18 is 1.5% too slow, aka when the speedo says 60 you're going 60.9
245/40-19 is 5.5% too slow, aka when the speedo says 60 you're going 63.3.
My setup, 245/35-19 is 1.7% too slow so when my speedo says 60, I'm actually going 61.
02-26-2004, 03:20 PM
#7
Turn off the VSA and see if you can fry the tires off it. If you can, it could be the traction control cutting power. The tires may just not have as much grip out of the hole so the VSA isn't permitting as fast of acceleration as before. A few 10ths which is what the difference would be if any would be isn't perceptible.
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02-26-2004, 03:25 PM
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Originally posted by Skeedatl
Turn off the VSA and see if you can fry the tires off it. If you can, it could be the traction control cutting power. The tires may just not have as much grip out of the hole so the VSA isn't permitting as fast of acceleration as before. A few 10ths which is what the difference would be if any would be isn't perceptible.
Turn off the VSA and see if you can fry the tires off it. If you can, it could be the traction control cutting power. The tires may just not have as much grip out of the hole so the VSA isn't permitting as fast of acceleration as before. A few 10ths which is what the difference would be if any would be isn't perceptible.
02-27-2004, 06:24 AM
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Bartman
Even though the wheel and tire combo may be similar in weight to the stock set up, the rotational inertia will increase because the larger wheel has more of the weight concentrated further away from the center. That extra leverage requires more torque to turn the wheels and so that's why your acceleration (and braking for that matter) will suffer with larger wheels.
Even though the wheel and tire combo may be similar in weight to the stock set up, the rotational inertia will increase because the larger wheel has more of the weight concentrated further away from the center. That extra leverage requires more torque to turn the wheels and so that's why your acceleration (and braking for that matter) will suffer with larger wheels.
02-27-2004, 10:07 AM
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Originally posted by TLMugen
Bartman
Even though the wheel and tire combo may be similar in weight to the stock set up, the rotational inertia will increase because the larger wheel has more of the weight concentrated further away from the center. That extra leverage requires more torque to turn the wheels and so that's why your acceleration (and braking for that matter) will suffer with larger wheels.
Bartman
Even though the wheel and tire combo may be similar in weight to the stock set up, the rotational inertia will increase because the larger wheel has more of the weight concentrated further away from the center. That extra leverage requires more torque to turn the wheels and so that's why your acceleration (and braking for that matter) will suffer with larger wheels.
Do you think this would change if I kept the same overall diameter by changin to 235/40/18?
02-27-2004, 06:58 PM
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It's hard to say how much braking will be affected, maybe a couple of feet from 70-0. I guess you'd have to measure it using a G-meter for accurate results. As far as the tire size goes, I'm not sure there would be much difference between the two 18" sizes. The biggest hit would have been with the Plus-2 upgrade.
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