I am going to be putting DR's on after work to head to the track. Am I going to be ok with these tire changes?

Current
(F)245-40-18
(R)275-40-18

New
(F)245-40-18
(R)275-35-18 (DR's)

I am not going to put them on if my VDC flips out on me because I am going to run these for a few weeks.

 

bump - according to a website its only a 4mm difference btween the front and rear diameter. Is that enough to trigger the VDC?

 

BUMP!!!

Anybody?? Someone has to know...

Also, how bout 245/40/18 with 285/35/18.

I've seen both setups on diff cars here on the forum, but I'm unsure if any of them were equipped with vdc/tcs

Did the math on both, and both are within 3%. But I'm trying to figure out how sensitive vdc/tcs really is.....

 

Some have said it is possible to run all four the same size while others say it causes SLIP on long sweepers at speed.

Nowhere that I have seen has anyone reported being able to run smaller diameter backs compared to the fronts. 275/35R18 is -.14" smaller than 245/40R18.

285/35R18 should be .13" larger than 245/40R18 but it's tough to say if it will negatively affect your car.

Also, among different tires, even of the same brands, these measurements are more of a guess than definitive. For instance the tread of a stock 235/50R17 tires are wider than stock 245/45R18 tires. So with numbers as close as .13", running them may be the only way to tell if they will cause SLIP

Chris

 

I run the drag radials size 265 40 18 on my stock wheels when I hit the track. I have had not one issue.

 

What brand are your tires?

 

Why no turn VDC OFF?

 

I am running 245/40 and 285/35 and haven't had a problem with VDC, Falken FK452