Sebring27

I have a 2004 C5 Z06 that I am using as a track care at sebring.
I have fitted NT-01's on the car 315/30/18 the back and 275/40/17 on the front. I also have a newly fitted Wilwood kit Brake kit. The Active Handling/ ABS service light constantly appears which I have read about - could be the SS lines? However perhaps it could be the tires as the backs are now 30's and not 40's? Additionally any thoughts on how the 30's as opposed to the 40's will effect handling ?

If anyone has opinions, experience or knowledge it would be highly appreciated

Many thanks !

63Corvette

IMO.....the rear tires must be about 0.5" larger in diameter than the front tires or you will get codes.

froggy47

research or measure the tire heights & post back.

Or run in comp mode or all nanny off.

Sebring27

Back wheels now 24.75"
Front whesl now 24.5"

Also have Z16 !

froggy47

I think that's the issue the sizes are too close. I would recommend just run comp mode or all nanny off & you'll be fine.

RDnomorecobra

interesting how some have a problem with that and some don't. I run a square setup with a 2003 z06 and have no lights/codes/etc.

SouthernSon

18" square all around with no nannies and no problems - '03 Z.

sothpaw2

I ran that combo on track this year and drove to + from without codes or lights.

My car is a 2002. Maybe the newer car had a different PCM calibration??

froggy47

OP has an 04, GM messes with the algorithm from time to time yr to yr.

stevensa

FWIW my 02z has no issues with those exact tires in those sizes.

talon95

I've run the 275/315 combo in Kumho MX's on my '03 without problems. Another local guy has that same size combo in the Azenis 615k's with no problems, his is an Z16 even.

lbk16

I run the same sizes (Toyo R888) on my 03Z with no issues.

johninar

I'm on my third set of the exact same NT01 sizes without any issues or DIC messages.

Soloontario

I ran 315s all round with my Z16 car. No problem with nannies on or off.
(Did have hub issues which triggered dreaded "service traction control...ABS light but fixed with new hub)

Your problem may not be the tire sizes.

theVcar

The issue I believe starts with 2005. I have a post asking same question. Because I want slicks.

randomus

I'm running the C5 Z06 wheels on my 2008 C6 with those NT-01 sizes and need to to into competition mode to drive without issues.