I would like to have your .02 regarding 19's all around or 19 front and 20's rear.
19's my understanding I'm going to lose the stagger look and the size of the tire could make it a bit more difficult to turn, AND vettes were designed with a stagger for handling purposes so the front would understeer.
20's in the rear......... I have read lose of traction, handling is horrible, the 3% from OEM will be difficult to meet, which can throw off the slip differential and the computer.... (yeah that topic was a bit intense for me)
I did call the manufacture and he was rambling on how he has sold 100's of set ups with 20's in front and 22's on the rear. They have not had any problems rubbing as well.
well I will be installing my new 19 20 tomorrow, they'll be wrapped in 275/35/19 and 305/35/20 so ill keep you posted on how they do.
I have read that you have to cut or remove your brake ducting it makje them fit, but I will also let you know about that.
You realy do not want to take away from your stagger, the front end of a corvette being lower then the rear is essential for the car to handle and accelerate properly, everything that went in to the design was based on the car being nose down.
Personally, I think you can have too little of a sidewall. I don't think a wheel that's all "wheel" and no rubber looks particularly good. IMO, some beef on the sidewalls is more aggressive and "lighter" looking than a lot of large diameter chrome.
Besides aesthetics, low sidewalls can actually be problematic. The sidewall is what protects your wheel from road debris and potholes. And contrary to what many believe, really skinny sidewalls do not necessarily enhance handling. Short sidewalls effect a phenomenon called "Transient Steering Response" by reducing how much tire flex occurs between the road surface and the wheel/suspension. But this same reduced tire flex interferes with the tire's ability to conform to the road surface when subjected to high loads, and can be especially problematic for gaining traction. Look at any drag racer and you'll see that the rear tires have the tallest sidewalls possible. That tall sidewall allows significant flex (which will be evident at launch as ripples in the sidewall caused by the torsional windup effect) and greatly enhances traction. Also, really skinny sidewalls can increase tramlining effects, which can make the car unpleasant to drive on rutted/uneven road surfaces.
If you mostly care about looks, none of these comments matter. But if it's performance that you're seeking, you might want to reconsider mounting what amounts to banana skins instead of real tires!
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Oh I was not aware of the cut or the removal of the brake ducting....please keep me updated
Rocketsled.... yes I do see what you are saying. Would I not be able to purchase a tire in 20's that have some meat on them? Or would the 20's with meat cause potential for rubbing.
Yeah the easiest thing to do would be to look for other wheels that have the option to purchase 18's...... ha
The wheel opening (rear) doesn't really accommodate a much larger diameter than stock. Some guys have put bigger wheels on the car and IMO, it looks much better when there's less gap around the wheel opening. But I'd be worried about going much more than 1/2" larger radius especially if I was also going wider.
If you went to a 20" and kept a the same height sidewall, you'd be 1" larger.
On my C5 I'm running 315/30-18s in back and 285/30-18s in front and those are about the widest you can fit and not severely impact TC and not have any rubbing concerns. Would a 315/30-19 (if one is made, that is) fit OK? I don't know but if it did I think it'd be close...
If you don't already have a copy, click my sig, scroll to the bottom and grab a copy of the tire computation spreadsheet. It's pretty self-explanatory, and it does pretty much all the math for you. It's designed to test tire stagger, not overall diameter, but it computes overall diameter if you provide the tire size and wheel diameter. Won't tell you everything you need to know, but it does make the figuring-out part a little easier, maybe...
Funny you mention your tire computation spreadsheet. That was one of the first threads I opened. I believe it was dated on a 2004 thread. I fewed your spreadsheet and it helped. And that is when I decided to start my own with these outstanding questions/concerns....... It trully sounds 20's are just too much drama. I'll have to go back to the drawing board. Those wheels sure were nice. Black with a red lip................... Thank you again for your help.
My 04 z06 has 19x9.5 and 20x10.5 275/30/19 and 295/30/20, it had 305/25/20... too short a sidewall. went down a little in width but I feel better w/ more sidewall.
The wheel opening (rear) doesn't really accommodate a much larger diameter than stock. Some guys have put bigger wheels on the car and IMO, it looks much better when there's less gap around the wheel opening. But I'd be worried about going much more than 1/2" larger radius especially if I was also going wider.
If you went to a 20" and kept a the same height sidewall, you'd be 1" larger.
On my C5 I'm running 315/30-18s in back and 285/30-18s in front and those are about the widest you can fit and not severely impact TC and not have any rubbing concerns. Would a 315/30-19 (if one is made, that is) fit OK? I don't know but if it did I think it'd be close...
If you don't already have a copy, click my sig, scroll to the bottom and grab a copy of the tire computation spreadsheet. It's pretty self-explanatory, and it does pretty much all the math for you. It's designed to test tire stagger, not overall diameter, but it computes overall diameter if you provide the tire size and wheel diameter. Won't tell you everything you need to know, but it does make the figuring-out part a little easier, maybe...
Hmm I am not I agree with this. Currently I am riding on 275/30/19 and 305/30/20. I took it out for a good ride to make sure I am not going to be rubbing or causeing any other issues. The car is 100 times better then it was before I swapped wheels. Oh and just to add one more thing...My car is lowered 3 inches. So if it will fit a car that has been lowered that much it will definately fit yours.
I would not recommend going with any smalled of a series tire then 30 though, nothing looks worse then a rubber band around some big wheels. But if a 30 series is still to small for you then i am not sure, I know i do not have much room left to go with any bigger side wall, but again my car is pretty low.
Last edited by corvette_girl20 : 01-17-2010 at 08:58 PM.
those are some monster size tires. 305/35-19. nice. 305/30-20 wow
if you want to go 19" all the way around. just go up on your size to compensate.
265/35-18 has circumference = 25.30
305/35-19 has circumference = 27.40
jump to this on front
265/30-19 = 25.25 so it would fit
and keep the 19 you already have just change out the rim.
you just need to go by that number. As long as the tires has same circ, you can run what ever size rim you want.
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Last edited by ProfessorBlaze : 01-18-2010 at 05:07 AM.
Hmm I am not I agree with this. Currently I am riding on 275/30/19 and 305/30/20. I took it out for a good ride to make sure I am not going to be rubbing or causeing any other issues.
Well... in spite of a 2" bigger rear wheel diameter, because of the narrower tread (305 compared to the 315 I was theorizing about), the overall diameter of your rear tires is only 1" larger than stock. Your front tires are almost exactly the same diameter as stock. In my note, I said that I'd worry about having a tire with > 0.5" larger radius. Your setup doesn't meet that criteria. The back tires are almost exactly 0.5" larger radius.
So no need to disagree, your configuration is within my recommendation!
That being said, you do have a 3.5% difference in front/rear stagger with the rear tires being bigger proportionally to the fronts. That does unquestionably effect Traction Control. But luckily, the shift is in the "right" direction, to make the rear tires look like they're turning slower in proportion to the front tires. This causes TC to engage at a higher "slip rate", you get more wheel spin before it intrudes.
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