Tires affecting active handling?
Tires affecting active handling? I am getting ready to pick up a set of tires, and I am wondering if the sizes being slightly off from the stock sizes would affect the active handling / traction control system in the car. It is an 01 ZO6.
The tire sizes are 275/40/17 in the front, and 295/30/18 in the rear. The tires are the new Kumho Ecsta SPT.
I am thinking the only thing that may give any problem would be the rear tires being slightly shorter, and I am aware that plenty of people use the 275/40/17's in the front.
Thanks in advance. I already searched, but never really found my answer.
The tire sizes are 275/40/17 in the front, and 295/30/18 in the rear. The tires are the new Kumho Ecsta SPT.
I am thinking the only thing that may give any problem would be the rear tires being slightly shorter, and I am aware that plenty of people use the 275/40/17's in the front.
Thanks in advance. I already searched, but never really found my answer.
On The Tree
Joined: Mar 2005
Posts: 157
Likes: 0
From: Pasadena, MD
I would recommend against it. The 295/30-18 is way too short. The T/C-A/H system on your car was designed to work with the rear tire being 0.7” taller than the front tire. The systems seem to work fine with as little as 0.4 inch difference. The rear tire you have chosen is only 25” tall. The front tire is 25.7” tall. The FRONT tire will be 0.7” taller than the rear. This will cause the T/C-A/H to malfunction.
Why not just go with the 295/35-18 or 305/35-18? These will work perfectly with the 275/40-17 front tire.
Why not just go with the 295/35-18 or 305/35-18? These will work perfectly with the 275/40-17 front tire.
I may use the Nitto 555's in the front and go with Nitto 555R2 305/35/18's in the rear. Thanks for your input. Anybody else?
I am just looking for good tires for the money, I can't see myself dropping $1500+ for Supercars, or PS2's.
I am just looking for good tires for the money, I can't see myself dropping $1500+ for Supercars, or PS2's.
I would recommend against it. The 295/30-18 is way too short. The T/C-A/H system on your car was designed to work with the rear tire being 0.7” taller than the front tire. The systems seem to work fine with as little as 0.4 inch difference. The rear tire you have chosen is only 25” tall. The front tire is 25.7” tall. The FRONT tire will be 0.7” taller than the rear. This will cause the T/C-A/H to malfunction.
Why not just go with the 295/35-18 or 305/35-18? These will work perfectly with the 275/40-17 front tire.
Why not just go with the 295/35-18 or 305/35-18? These will work perfectly with the 275/40-17 front tire.
You seem to know what you're talking about so if you dont mind, answer this one for me.
I didnt think about the TCS before I bought my rims and tires. I have CCW 505a 18X10 in the front and 19X11.5's in the rear. Im putting 275-35-1's in the fromt and 315-25-19's in the rear. Is that going to affect it at all? I have yet to get them changed... but its going to be done soon.
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295/30/18's as opposed to 295/35/18's? Do you have any problems with the active handling system. I was told with the rear tires being shorter, that the system would react the same way as if the car had slight tire spin.
I am still considering the Kumhos, but not if it is going to give me any problems with the A/H system.
I am still considering the Kumhos, but not if it is going to give me any problems with the A/H system.
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I will give them a shot. How do you like them otherwise, as far as handling, controlability. How does the car ride? Are they good on the highway, as far as grabbing grooves, ruts? Thanks alot.
On The Tree
iTrader: (1)
Joined: Nov 2005
Posts: 179
Likes: 7
From: Braking Point, Turn In, Apex, Exit - Repeat
I know a guy running 275-35-18 F and 295-30-18 R on an 02Z and he road races the car with no problems. I have seen instances where if you get too small with the rear tire that the active handling will freak out though. Best I can say is try it and see how your car reacts you can always turn it off. Unfortunatly if your active handling has a problem with it so will your ABS so you should be careful.
I believe that the GM manual says that the tires have to be within 9% of there standard size. So you will have to look at a tire diameter calculator.
Like this
Width x Aspect Ratio = Section Height x 2 = Combined Section Height + Wheel Diameter = Tire Diameter
Example
275-35-18
275x.35=96.25x2=192.5+457.2(18")=649.7 or 25.57"
265-40-17
265x.40=106x2=212+431.8(17")=643.8 or 25.34"
295-35-18
295x.35=103.25x2=206.5+457.2(18")=663.7 or 26.13"
295-30-18
295x.30=88.5x2=177+457.2(18")=634.2 or 24.97"
The front tire is about 1% larger and the rear tire is about 5% smaller so you have about a 6% differance so you should be fine.
The thing that sucks about using the 295-30-18 is that it lowers the back end of the car and creates a bigger gap between the fender and the tire, which looks kind of dumb. Also to get the car to handle properly you should raise the back end up to re-set the rake properly which will make the tire to fender gap even larger.
The 275-35-18 and 315-25-19 will be even better the overall differance between those 2 is about 5%.
I believe that the GM manual says that the tires have to be within 9% of there standard size. So you will have to look at a tire diameter calculator.
Like this
Width x Aspect Ratio = Section Height x 2 = Combined Section Height + Wheel Diameter = Tire Diameter
Example
275-35-18
275x.35=96.25x2=192.5+457.2(18")=649.7 or 25.57"
265-40-17
265x.40=106x2=212+431.8(17")=643.8 or 25.34"
295-35-18
295x.35=103.25x2=206.5+457.2(18")=663.7 or 26.13"
295-30-18
295x.30=88.5x2=177+457.2(18")=634.2 or 24.97"
The front tire is about 1% larger and the rear tire is about 5% smaller so you have about a 6% differance so you should be fine.
The thing that sucks about using the 295-30-18 is that it lowers the back end of the car and creates a bigger gap between the fender and the tire, which looks kind of dumb. Also to get the car to handle properly you should raise the back end up to re-set the rake properly which will make the tire to fender gap even larger.
The 275-35-18 and 315-25-19 will be even better the overall differance between those 2 is about 5%.
On The Tree
Joined: Mar 2005
Posts: 157
Likes: 0
From: Pasadena, MD
You seem to know what you're talking about so if you dont mind, answer this one for me.
I didnt think about the TCS before I bought my rims and tires. I have CCW 505a 18X10 in the front and 19X11.5's in the rear. Im putting 275-35-1's in the fromt and 315-25-19's in the rear. Is that going to affect it at all? I have yet to get them changed... but its going to be done soon.
I didnt think about the TCS before I bought my rims and tires. I have CCW 505a 18X10 in the front and 19X11.5's in the rear. Im putting 275-35-1's in the fromt and 315-25-19's in the rear. Is that going to affect it at all? I have yet to get them changed... but its going to be done soon.
I’m not sure what to tell you. There are people here saying that they’ve run shorter tires in the rear and it works fine. I have spoken to many people and it has been my personal experience that having the same height tires front and rear or shorter tire on the rear will cause the T/C-A/H to malfunction. My 315/35-17 drag radials are about 0.1” shorter than my front tires and the T/C senses wheel slip and tries to activate when it shouldn’t. I can’t stand the T/C-A/H and always turn it off anyway, so it doesn’t really matter to me.
The shorter tires are also going to throw off your speedometer, but you should be able to reprogram the PCM to correct the speedo.
I like to say “the one who says it can’t be done shouldn’t get in the way of the one doing it” If you guys are running shorter tire in the rear and it’s not affecting the T/C-A/H more power to you.
Thank you all for your inputs. I am going to try the Kumhos, but if I have ANY problems with AH/TC/ABS they are coming off the car and I am going with Nitto 555's.
Teching In
Joined: Jan 2007
Posts: 23
Likes: 0
From: SFO
Well, you were running 19's in both front and back. Im running 18s in the front and 19s in the back... so there isnt that much difference. Your front tire was a lot taller than the rear and im sure that would have thrown the system off a little.