klieber

I've searched quite a bit in the forums and got quite a bit of info from the "what I have learned" sticky. That said, as I look at my first tire/wheel purchase, I still have a few questions/clarifications I'm hoping to get some help with.

I run mainly HPDE events and informal track days. Nothing sanctioned or formally competitive. I'm not good enough to worry about eeking out every last tenth of a second from my tires, so I'm just looking for something that's a step up from high performance street tires. What I would like to purchase:

• GM Speedline wheels -- 18x10 all around
• Toyo R888 tires

Ideally, I would like to run the same size tire on all 4 wheels so I can carry a 5th spare around, which leads to my questions:

• Can I reasonably run the same size tire all around or am I asking for problems?
• I can't find a clear answer on whether doing this will cause problems with the ABS and/or active handling. Some threads say yes, others say they run with no problems.

Thanks!


EDIT: Subsequent to posting, I found this site which seems to suggest I can't run the same size tire. Does the computer just complain about it or does it actually shut off ABS and/or active handling?

UstaB-GS549

You just cannot run a larger front tire unles you trurn off TC. Same diamter front and rear is not a problem with C5.

klieber

OK, thanks for the reply. If I'm going to run the following tires:

• (2) 275/35/18 Toyo R888 - fronts
• (2) 305/35/18 Toyo R888 - rears

Can I run them all on 18x10.5 speedline wheels or do I need 9" wheels on the front?

Last C5

I run 18X10.5s with 315/30/18s on all four corners - no problem.
305/35 will work on all four corners too.

klieber

Do you run with the nannies on or off? If on, does the computer complain at all?

emptnest

I have same questions.

savage

AS SOMEONE else said your ok to run all the same wheel/tire size with no nannies/trouble. your rears are 305/35/18, they are taller than the 275/35/18 fronts. feel better?

savage