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I have a 2001 coupe, would like to go 18/19 instead of factory size.
would front 18x8.5 with 56 offset, and rear 19x10 with 56 offset work??
Any rubbing up front, or spacers needed?? Tire sizes???
I would do a 265/35/18 front and a 305/30/19 rear. That way the sidewall height on the tires will match. If you do a 285/30/18 it will be 1/2 shorter than the 305/30/19 in the rears.
I have 18x9.5 50 and 19x11 55 with 265/35/18 and 305/30/19
Last edited by zdeckich; Jan 15, 2016 at 05:07 PM.
No. I have 15k miles on a my current setup, which is a perfectly square 275/35/18 setup. 20 autocrosses, and a track day. No codes as long as i keep the tire pressure in the rear higher than the front.
Yeah I've read myself on a previous thread that the front wheels have to be 1/2" or more smaller overall than the rear, otherwise the traction control will constantly get turned on if you leave it on, and it applies the rear bakes and reduces / stops fuel from being used so you can't accelerate... Sounds like that's not been true in your case Sox-Fan?
On a note separate from the previous paragraph, I have a wheel size question as well, and based on the title of this thread, don't really want to make another thread lol Anyone happen to know the biggest tire sizes you can do on the factory wheel set up? Currently running stock set up, 17's in front, 18's in back, front tires 245/45/17, rear 275/40/18. I'm about to be in need of new rear tires and want to go up in size but I'm not sure how large my tires can be on the stock wheels. I think 295 is the biggest width that will fit on them, not sure about the aspect ratio though, or if 295 is actually correct, could be more or less for all I know. Also, my C5 is a 2000 Hardtop if that makes any difference at all.
Of course, by "biggest tire sizes you can do on the factory wheel set up," I also mean the biggest sizes you can do with out needing any modifications to prevent any rubbing or grinding, no tubbing of the wheel wells, no spacers or anything like that lol Just wanted to make sure that was known and evident, rather than assumed.
Lastly, zdeckich, that thing is absolutely beautiful! Looks incredible with the black / red mix going on.
Last edited by StealthStrike42; Jan 16, 2016 at 07:29 AM.
...Anyone happen to know the biggest tire sizes you can do on the factory wheel set up? Currently running stock set up, 17's in front, 18's in back, front tires 245/45/17, rear 275/40/18. I'm about to be in need of new rear tires and want to go up in size but I'm not sure how large my tires can be on the stock wheels. I think 295 is the biggest width that will fit on them, not sure about the aspect ratio though, or if 295 is actually correct, could be more or less for all I know...
The biggest tire that will fit in the rear on a stock rim is 285/40-18. I ran these when I had 18" wheels all around. A 295/35-18 is smaller in diameter.
Some C5's are more sensitive to maintaining a tire size delta than others. Most run a 1/2" to 1 1/2" larger overall diameter rear tire than front to avoid TC issues (TC engaging when you don't want it to). Codes do not get set when TC applies it self under expected conditions. ie computer thinks the rear tires are spinning faster than the front. You will, however, get warning messages displayed in the DIC when TC does engage.
Only way to know for certain if your car will function correctly, relative to TC, is try the sizes you want. You can always turn TC off every time you start the car if the tire sizes are wrong for your car.
Sweet, thanks for the info man.
Originally Posted by c5vetteguy
The biggest tire that will fit in the rear on a stock rim is 285/40-18. I ran these when I had 18" wheels all around. A 295/35-18 is smaller in diameter.
There's no 295/40/18 that would fit the stock rear? Would you need to go up to 19's to fit 295 and bigger?
And what about the front? 255/45? 265/45? (17's of course)
Yeah I've read myself on a previous thread that the front wheels have to be 1/2" or more smaller overall than the rear, otherwise the traction control will constantly get turned on if you leave it on, and it applies the rear bakes and reduces / stops fuel from being used so you can't accelerate... Sounds like that's not been true in your case Sox-Fan?
I can only truly speak for the car that I currently own and drive. Of the three Corvettes that I have owned this is the only one where I have adopted a truly square setup. I always leave traction control ON (default setting) on the street, where I have over 15k miles on this setup. Traction control never turns itself on randomly. I think the only time that I remember seeing the light flash was hitting a bump in a puddle on a right turn. It truly has never been an issue. I will say, again, that I am very vigilant about tire pressures. I've even installed TMPS on my z. I stick then at least once a week, usually more often. I always keep the rears a minimum of one pound cold, higher in the rear than the front. Once the tires have warned up they'll grow an additional one pound in the rear over what the front grows to.
As Chuck said, some cars are more sensitive than others. Some are sensitive to rake. Some are not. (I bet that's inversely proportional to how much soda you've spilled on the passenger side. kidding ). The only way to know is to bolt them on and go.
I do know that I frequently autocross with another guy in a z that is also running true square on a car that doubles as his daily driver. He also has no issues. I do not know what he's doing for tire pressures, ride heights, rake, etc.
As a side note, while autocrossing or on the roadcourse my air pressure setup is a lot different that what I run on the street, but under those conditions traction control is disabled anyway.
Four years ago, when I went looking for 18" tires, there were no 295/40-18s that I could find. They should fit fine. Either choice in front sizes will also work.
I can only truly speak for the car that I currently own and drive. Of the three Corvettes that I have owned this is the only one where I have adopted a truly square setup. I always leave traction control ON (default setting) on the street, where I have over 15k miles on this setup. Traction control never turns itself on randomly. I think the only time that I remember seeing the light flash was hitting a bump in a puddle on a right turn. It truly has never been an issue. I will say, again, that I am very vigilant about tire pressures. I've even installed TMPS on my z. I stick then at least once a week, usually more often. I always keep the rears a minimum of one pound cold, higher in the rear than the front. Once the tires have warned up they'll grow an additional one pound in the rear over what the front grows to.
As Chuck said, some cars are more sensitive than others. Some are sensitive to rake. Some are not. (I bet that's inversely proportional to how much soda you've spilled on the passenger side. kidding ). The only way to know is to bolt them on and go.
I do know that I frequently autocross with another guy in a z that is also running true square on a car that doubles as his daily driver. He also has no issues. I do not know what he's doing for tire pressures, ride heights, rake, etc.
As a side note, while autocrossing or on the roadcourse my air pressure setup is a lot different that what I run on the street, but under those conditions traction control is disabled anyway.
Thanks for providing so much detail on that, quite interesting information! When you say you "even installed TPMS" on your Z, was that not a factory option? My 2000 hardtop is throwing me an error message about TPMS not working, so I'm practically certain it came with TPMS from the factory. Plus the readings show up in the gages section of my DIC.
Originally Posted by c5vetteguy
Four years ago, when I went looking for 18" tires, there were no 295/40-18s that I could find. They should fit fine. Either choice in front sizes will also work.
Wow, sweet haha Been wanting to get 295's! Wasn't sure if it would work, but nice to know it will with aspect ratio of 40.
So 295/40/18 and 265/45/17 will work with no rubbing or spacers needed or anything else at all? That'd be wicked awesome.
Also, curious to know, what's the impact of getting larger tires like that? I think it's safe to say more grip, is handling improved? Is the ride smoother or rougher? (Yes, I want bigger tires and don't fully understand the impact yet haha I love really wide tires, think they look awesome, which is the reason I want to get wider tires than stock!)
Last edited by StealthStrike42; Jan 16, 2016 at 07:19 PM.
C5 Z06's did NOT come equipped with TPMS and there was no factory option for it on the Z06. To install TPMS in a C5 Z you have to have someone with a Tech II enable the TPMS feature in the BCM to get them to work/show up in the DIC. Not as simple as just installing the TPMS in the wheels and calling it a day.
Am I the only one that finds it odd that the previous year's base model came with TPMS and the Z did not?
My 2000 hardtop is throwing me an error message about TPMS not working, so I'm practically certain it came with TPMS from the factory. Plus the readings show up in the gages section of my DIC.
I reference to enabling it on my car. It's disabled from the factory for the z06, and there are no sensors in the z06 wheels. But it's there, just shut off. 2 minutes with a TechII and it's on. Set of sensors in the wheels and you're good to go.
You car, however, came with it on and with sensors, as you've noted. If you have the original factory wheels the batteries in the sensors are probably long dead. If the wheels have been changed then either the batteries are dead or perhaps there are no sensors in the wheels.
I would do a 265/35/18 front and a 305/30/19 rear. That way the sidewall height on the tires will match. If you do a 285/30/18 it will be 1/2 shorter than the 305/30/19 in the rears.
I have 18x9.5 50 and 19x11 55 with 265/35/18 and 305/30/19
Your car makes me wish I would of kept it simple but too late now
Cleaner den a biatch
Last edited by ZeeOh6vette; Jan 16, 2016 at 10:34 PM.
Your car also came with run flat tires from the factory. The C5 Z06 did not. Ask GM why they did what they did........
Wow.... They definitely made some interesting decisions...
Originally Posted by Sox-Fan
I reference to enabling it on my car. It's disabled from the factory for the z06, and there are no sensors in the z06 wheels. But it's there, just shut off. 2 minutes with a TechII and it's on. Set of sensors in the wheels and you're good to go.
You car, however, came with it on and with sensors, as you've noted. If you have the original factory wheels the batteries in the sensors are probably long dead. If the wheels have been changed then either the batteries are dead or perhaps there are no sensors in the wheels.
Yeah I've got factory wheels and there are sensors there, they just aren't working. Need new ones. Cheapest price I've ever heard of is from discount tire, they can snag em for me for only $60 a piece.
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Another wheel size thread!!!!
The tire sizes in the above post would work fine.
