Tire size change
Thread Starter
Burning Brakes
Joined: May 2004
Posts: 929
Likes: 45
From: Wayne NJ
Tire size change
My C5 vert has 245/45 and 275/40. Could i put on 255/40 and 285/35 on it? I have the factory rims which are 17 and 18 inch.So in other words a lower and wider tire and keep the factory rims.
Safety Car
Joined: Apr 2007
Posts: 3,640
Likes: 83
From: . New York
In order to avoid problems with the active handeling you probably should look into two things:
1) Have to retain a bias, (different size between front and back).
2) Same overall outside wheel diameter.
Uusally comes up when people put larger rims on the car, they have to get tires with a shorter sidewall hieght, so that the outside diameter of the tire (the part that touches the road) remains the same size.
You are keeping the stock rims and going to shorter tires, so I would think you are changing the diameter of the outer (driving surface) of the wheel, I would think that may cause you problems when the wheel speed sensors see that the rear wheels are turing faster than they should be (in relation to the fronts).
Although in your setup they both should get smaller (by the same amount?), Im not qualified to say whether that will work.
There are a lotta posts on it though, serach for 20 inch rims.
Good luck.
1) Have to retain a bias, (different size between front and back).
2) Same overall outside wheel diameter.
Uusally comes up when people put larger rims on the car, they have to get tires with a shorter sidewall hieght, so that the outside diameter of the tire (the part that touches the road) remains the same size.
You are keeping the stock rims and going to shorter tires, so I would think you are changing the diameter of the outer (driving surface) of the wheel, I would think that may cause you problems when the wheel speed sensors see that the rear wheels are turing faster than they should be (in relation to the fronts).
Although in your setup they both should get smaller (by the same amount?), Im not qualified to say whether that will work.
There are a lotta posts on it though, serach for 20 inch rims.
Good luck.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
Likes: 21
From: Waldorf MD
You need the rear tires to be at least 1/2 inch taller than the front tires (Tire Rack lists the diameter (height) of all their tires) for your traction control and active handling to work properly.
The stock tires have an 1 inch difference in heights.
You CAN drive with traction control and active handling off, but WHY ?
The stock tires have an 1 inch difference in heights.
You CAN drive with traction control and active handling off, but WHY ?
Drifting
Joined: Oct 2004
Posts: 1,591
Likes: 1
From: San Jose CA
Thats what I did. End of last year I went with General Exclaims (non RFs; 255/40/17s up front, 285/35/18 rear) from Tire Rack, stock thin spokes, on a 2000 C5 coupe. My vette is lowered on stock bolts.
I also replaced the F45 suspension with all C5Z parts (shocks, springs, sways etc). Prior to doing this change, I had Michelin ZPs and before that Goodyear RFs (all stock size).
I can tell you its made a big difference in handling (and looks much better (side profile) compared to the ZPs). I haven't had any problems with this change other than why didnt I do this before?
Also, my vette is not a dd, drive to work sometimes, otherwise its mainly a garage queen/weekend toy.
BTW check with your local vette clubs...you'll find that others have already did this.
Good luck!
Race Director
Joined: Jan 2002
Posts: 19,557
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From: I love you & miss you Linda
2017 C7 of the Year Finalist
St. Jude Contributor
Pro
Joined: Sep 2006
Posts: 571
Likes: 0
From: Milwaukee Wi
[QUOTE=Oldvetter;1569992366]You need the rear tires to be at least 1/2 inch taller than the front tires (Tire Rack lists the diameter (height) of all their tires) for your traction control and active handling to work properly.QUOTE]
I've been running 315-30-18's all around for almost 3 weeks with no issues with AH/TC. I just wanted to try it. I'm putting back on my other set soon but I wanted to rough these up some before I start autocrossing it.
I've been running 315-30-18's all around for almost 3 weeks with no issues with AH/TC. I just wanted to try it. I'm putting back on my other set soon but I wanted to rough these up some before I start autocrossing it.
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Drifting
Joined: Jun 2007
Posts: 1,437
Likes: 5
[QUOTE=Rickyh93;1569998526]
Did you reprogram your PCM with the new tire sizes? If you did, that's the reason your TC/AH isn't barking at you.
You need the rear tires to be at least 1/2 inch taller than the front tires (Tire Rack lists the diameter (height) of all their tires) for your traction control and active handling to work properly.QUOTE]
I've been running 315-30-18's all around for almost 3 weeks with no issues with AH/TC. I just wanted to try it. I'm putting back on my other set soon but I wanted to rough these up some before I start autocrossing it.
I've been running 315-30-18's all around for almost 3 weeks with no issues with AH/TC. I just wanted to try it. I'm putting back on my other set soon but I wanted to rough these up some before I start autocrossing it.
Burning Brakes
Joined: Sep 2007
Posts: 832
Likes: 0
From: PSL FL
I also ran the same size tire all the way around on my car for about 9 months with only the rare amount of times the traction control warning. I did this because I already had the tires and for no other reason. Now I have since switched to some 285's.
