i just bought 4,,,,,,,,,,,, 18 by 9.5 wheels, fer my 98 vert.

how wide a tire, can i go on these rims ?

and still avoid any rubbing issues. :confused:

stock (rear) is 275/40/18. i'm lookin at 285 or 295's

will both work?

thanks,,,, fer yer help..

 

no one????? KNOWS? :banghead:

also on another board, someone said running the same sizes, front and rear?

would cause the traction control to engage,,,,,,,, at about 60 mph??

any truth,,,,,,,, in this?? :eek:

 

295/35/18 will work, many have done it, but it should ideally be on a 10.5" wheel.
For the front, you will want 265/35/18 tires.

And yes, running the same tire size all around is asking for traction control problems. The active handling and traction control systems are based on tire rotation rates front and rear, and stock, the rear tires are 1" taller and you want to maintain that height stagger as close as possible when changing tire/wheel sizes..

The 265/295 combo is what most everyone runs with 18's all around.

:cheers:


[Modified by Y2Kvert4me, 3:48 PM 8/11/2003]

 

ok good information, much appreciated........
;)
thank you... :thumbs:

 

I would like this explained to me. Since traction control only looks at the rear wheel slippage, why would running the same tires cause the traction control to engage? Active handling looks at all four wheels, but only after the yaw sensor has sent a signal that the car is fishtailing.
Now running two different size tires on the back at the same time could cause a problem, since the computer would be clocking one wheel speed, different than the other wheel.
Curious....
So curious, I went to the GM explanation on how the systems operate on a Vette; not to be confused with other GM vehicles I am very familiar with...they work the same.

Per GM on the traction control system: When drive wheel slip is noted while the brake is not applied, the EBCM will enter traction control mode. Traction control does not look at the front wheel speed sensors.

Per GM on the active handling system: The vehicle stability enhancement system (VSES) includes an additional level of vehicle control to the EBCM. The VSES is activated by the EBCM calculating the desired yaw rate and comparing it to the actual yaw rate input. The desired yaw rate is calculated from measured steering wheel position, vehicle speed, and lateral acceleration. The difference between the desired yaw rate and actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. If the yaw rate error becomes too large, the EBCM will attempt to correct the vehicle's yaw motion by applying differential braking to the left or right front wheel.
System is not awaken until an unacceptable yaw rate is determined by the EBCM. Then and only then will the front/rear brake be applied.
So, can someone explain how the same size tires front and rear will affect traction of active handling? Still curious.




[Modified by WhiteC5Vette, 10:00 PM 8/11/2003]

 

I'm certain someone here will know this from experience...but if what you say is true, it should be possible to dyno a car with traction control on, correct?. Both rear wheels will turn equally, but the front wheels will not move, so traction control should not engage if your statement above is true.

Anyone try this (inadvertantly) and if so, what were the results? (I'm curious myself).

:cheers: