Bill Hilt

I want to put the same size wheels and tires all around and was wondering what size tire to use. 10.5 inch wheel .Here is the wheel I was thinking of can anyone comment.Im not looking for a huge tire just a good performer with this wheel look
http://cgi.ebay.com/ebaymotors/ws/eB...200978854&rd=1

CamaroAJ

ues the same thats on the back. 285's

Bill Hilt

That will work with no issues same offset wheel as well ?

Russ K

Those wheels are 18 & 19's. The best tire size would be 265/35/18 & 305/30/19.

If you want 18's all around, then use 18x9.5 with a 54-59mm offset for the front, and 18x10.5 with a 58mm offset.
Use 265/35/18 tires on the front with 295/35/18 tires on the rear.

Russ Kemp

Bill Hilt

I was hoping to use all the same size wheels and tires

Russ K

In order for the active handling to work, the front tires have to be ~1" shorter than the rear.

Russ Kemp

AU N EGL

You will have to run the AH / TC control turned OFF at all times.

Independent1

The link to the rims in your post are for 18s and 19s. Also the rim widths are different. If you want to run the same size tires front and rear you will need the same size rims. A lot of autocrossers and HPDE go with the C5 Z06 rear rims (18 X 10.5).

You could run 295s all around. However, you will probably have to turn off AH and TC or you will get all kinds of error codes.

Bill Hilt

thanks i think ill go with the 18 19 setup

AlwaysInBoost

couldn't you make up that difference in overall diameter with taller or shorter sized tires while still running C5Z 18x10 rims on all 4 corners?

say a 295/35/18 in the rear = 26" diameter
and a 295/30/18 in the front = 25" diameter

AU N EGL

Now I do run 18s on all four corners

Fronts 18x10 with 18x275/35
Rear 18x12 with 18x335/30

and I can leave TC / AH on.

Have run with 18x25.5x11.5 tires on all four corners. There is were the AH /TC needed to be turned off

AlwaysInBoost

I guess that answers my question then.

Sorry to the OP for hijack but... AU N EGL, since you know a thing or two about road racing, what tires would you recommend for auto-xing, a very limited amount of road course action, and street use if I was going to run those C5Z 18x10.5" rims?

I was thinking about doing Nitto 555RII in 285/35/18f & 305/35/18r, that should give me close to the correct diameter to not upset AH.

Or would you recommend another tire/brand?

AU N EGL

Nittos would be a very good choice and those sizes will work well. Now since those sizes are NOT stock sizes that would put you UP a class or two.

Dont worry about diameter, it is less important then ppl think. Just put the car in COMP mode or turn it OFF for any Auto-X.

Good Luck

Wah

I run 315/30/18s on all four. No problem with TC/AH/ABS whatsoever.

AlwaysInBoost

well, if I'm going to just run with A/H off then I don't need to run different sized tires F&R...

I have two sets of stock Z06 wheels, so I can run any one of three different combinations of wheel configurations, which would be best in your opinion for what I am doing?

17x9 all around
18x10 all around
or the stock 17x9f & 18x10r

I like the idea of running the same size wheels on all four corners, that way I can swap tires from front to rear and maybe get a little extra life out of them, but I'm not sure how that would change the handeling of the car. Plus 17" tires are cheaper then 18"'s.

thoughts?

AU N EGL

I would run the 18x10 rims then put a slightly smaller tire up front.

18x305/30 on the rear ( that might be a stretch )and 18x285/35 up front

If the 305 does not fit, then 18x295/35 on the rear and 18x275/35 front

as long as the rear OD is 'slightly" larger then the front there are no AH issues, of just turn it OFF.

A few years a go I was running 18x12 rims all around with GoodYear G19 slicks 18xx25.5x11.5 on all four corners. ( tires are about a 37 profile.)

I forgot to turn OFF the AH/TC.I was going though a high speed sweeper which I am at 85 and accelerating to 100 ( 3rd gear) waiting for the straight to shift into 4th.

The car was NOT slidding slightly to the left as it should have. I am going WTF ??? then I noticed that I did not push the AH/RC button. Pushed that mid corner at about 80 mph, and VROOMMMM away we go. If I would have lifted my right foot, I would become a Land scapping contractor for 100 yards.

Learning to drive with AH/TC Off is a huge plus on the track ( road course) On the street I leave it on all the time.

LT1driver

I run 18 all around, 18x9.5 frt, 18x11 back, 265/35 frt, 295/35 back

NJZ06

Hmmm. I just ordered OEM 18x10.5 Z16 wheels for all 4 corners. I also just ordered Bridgestone 285/30/18's as well for each corner.

Forgive me for the redundant question, I really don’t understand why I would have Active Handling or Traction Control problems with this setup. How does my car know the difference between tire width and overall tire/wheel height vs. what it comes with from the factory?

AlwaysInBoost

first question I have for you is which bridgestone tires did you order?

to answer you question, the reason why your car knows the difference is because a smaller diameter wheel, like the stock 17" front wheels on a z06, will spin faster then a larger 18" wheel.

there are wheel speed sensors that the ABS system uses to determine if you are locking up the brakes or not, I assume the TC system looks at that information aswell and uses it to determine whats going on in terms of traction. if it sees the f&r wheels moving at the same speeds, and its programed from the factory to be different under normal conditions, it would cause a problem.

AU N EGL

For normal driving it should not make on bit of difference. Now if your taking a sweeping corner out in the twisties, then yes the AHS will know the difference with the speed sensor input.