photoman9988

So I put some OEM 18/19 C6 wheels on my '99 WS6. I used the 1.25" adapters in the rear. Now, every time I brake, I can feel my ABS kick in, and it makes it difficult to brake. I have the stock brake setup and stock suspension. What can I do to fix this problem?

1998Z28LOADED

What is the tire size? The overall diameter needs to be within 1/2 inch or it will trigger the ABS. I have OEM with 295/30 rear and 275/35 front with no issues.

photoman9988

265/35/18
295/30/19

DaddySS

There's your problem: the 18s are 25.3 and the 19s are 26.1

photoman9988

So what should I do?

BandDirector Blk98ZM6

iTrader: (21)

Go to a 275/30/19 which would make the rears 25.5" tall...however, the ride will be VERY rough! That's the main reason I ended up ditching my C6's and went back down to 18's all the way around w/275/35/18's.

spaulsen

iTrader: (12)

ive got c6 wheels, 305-30-zr19s on rear, 255-35-zr18s in the front....no issues whatsoever....

spy2520

iTrader: (3)

temporarily i guess you could disable the ABS.

DaddySS

If you replace the fronts with a 265 40 18 it will be 26.1 also

Formulated

iTrader: (16)

Would a simple reflash of the ECU to calibrate the tire size / speedometer make this problem go away?

1998Z28LOADED

Not every car has issues with the difference in OD.

1998Z28LOADED

IMO the easiest solution is get on ebay and pick you up a pair of used 275/35/18s. They are one of the most common 18's, you can find a pair with 60-70% tread left for under $100 shipped almost any day.

photoman9988

but would 275's even fit on 18x8.5's? I thought 265 was pushing it...

DaddySS

Let's start with what brand tires you have now?

Tudds

iTrader: (4)

Does the ABS light come on?

1998Z28LOADED

Im pretty sure thats a 18x9 wheel

photoman9988

I have Pirelli P-zero Rosso's on.

Yes, my "ABS Inop" light comes on, and does my "TCS off" light. Also, every now and then when I first start up my car and take off, my "Low Trac" light will come on and REALLY screw up my braking until my abs light comes on.

I think they ARE 18x8.5 They are '09 C6 wheels, not Z06. They are the split spoke 18x8.5 and 19x10 i believe.

Major_Lee_Slow

iTrader: (1)

spaulsen's car is a 98 which had a unique ABS system vs. later years. photoman9988, what year is your car?

photoman9988

'99 with an '00 SS motor.

DaddySS

Looking at the pirellis, if you replace the fronts with 255 40s you'll be within .2 and will not trip the ABS.