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2G Rims and tires need help

EazyLoc

Proven Member
66
1
Feb 19, 2014
Brooklyn, New_York
A friend of mine just got new rims. So he wants to sell me the ones that were on his car. They are 18". At first I didnt want to because 18s on a dsm is ahhh. But he sent me a pic of how they looked on his old dsm. I was in love. My dad runs a tire place and he he said that if the tire sizes are not the same it will kill my awd. My friends wheels are wider in the rear then the front. So I came to the here to the experts to find out if I should or should not. I drive a 95 eclipse gsx awd auto transmission with only 70,000 miles on it no mods just maintenace done to it. Would putting these wheels on kill my awd?
 

HallerDSM

Proven Member
53
4
Sep 10, 2013
Mentor, Ohio
General rule of thumb for Awd is to keep all the wheels the same I no different diameter tires are not a good idea because different size tires rotate at different rates wich causes uneven wear and possibly even binding of gears. I don't know if the width would affect the same way. Two will obviously be slightly heavier wich could cause problems and you will probablly have some uneven wear I wouldn't chance it just for looks. Listen to what your father has to say sounds like he would know.
 

Chumpaumpalumpa

Proven Member
1,551
298
Jun 16, 2014
La Habra, California
Anybody agree with guy above I need to know asap.
absolutely!!!! width is NOT a problem, but diameter is..... think about it, say the rear were 18'' and the front were 17'', the 18'' rims are bigger, thus one rotation will cover more distance than the smaller 17'' rim.... its like locking up the front and having the rears roll, it would damage the drivetrain. sorry if that's confusing but as long as the rims and tires are all EXACTLY the same size as far as diameter, you are golden. width is fine if they are different.
 

xiteamxi

Proven Member
208
7
Sep 27, 2010
scranton, Pennsylvania
Correct Your center diff wouldn't be happy. But I'd also like to say you can have different rim widths, tire widths,or even different rim sizes and with the correct tire size/aspect Ratio the tires be the same height. Not that you would want to but it is possible.

---The simple answer make sure there all the same overall height and that they clear your rear knuckles and fenders all around.--
 

Chumpaumpalumpa

Proven Member
1,551
298
Jun 16, 2014
La Habra, California
The rear are 18x10 front 18x9
you sound like your ready to rock! :thumb:

make sure when you get tires the ONLY the width changes. for example, you could have 235/45/18 front and 245/45/18 rears. but if you had 235/45/18 front and 245/40/18 rear, this would not work because the middle number or the aspect ratio was changed, with whatever size you decide to get, make sure the middle number is the same and you will have absolutely no problems. ask your father for more assistance on what size to get.
 

2slow4now

Proven Member
1,312
37
Nov 20, 2008
somerset, Kentucky
No that isn't right. Aspect ration being the same with different widths makes the heights different. For an awd the actual tire rolling circumference has to be the same. It can be slightly off in circumference but not by much. Some say within 2%, some say within 1/4" circumference but in general closer is better.
http://www.rimsntires.com/specspro.jsp
 

Chumpaumpalumpa

Proven Member
1,551
298
Jun 16, 2014
La Habra, California
No that isn't right. Aspect ration being the same with different widths makes the heights different. For an awd the actual tire rolling circumference has to be the same. It can be slightly off in circumference but not by much. Some say within 2%, some say within 1/4" circumference but in general closer is better.
http://www.rimsntires.com/specspro.jsp
your right my bad its circumference not aspect ratio....... been a looong morning haha.
 

iloveboost

Proven Member
46
1
Jul 25, 2014
Vacaville, California
For 235/45/18, 235 would be the width in millimeters and the 45 would be the sidewall height being 45% of the width. You could possibly do 235/45/18 and 245/40/18 and that would be close, but again probably not worth the risk. On a 18x9 vs 18x10 you can usually put a couple of sizes and still have it work. You might be able to do 235/40/18 on both. You need to make sure that the offset is also good because I don't think 245 will fit and even 235s need a high offset. Keep the overall tire height with wheel is the most important.
 

Chumpaumpalumpa

Proven Member
1,551
298
Jun 16, 2014
La Habra, California
For 235/45/18, 235 would be the width in millimeters and the 45 would be the sidewall height being 45% of the width. You could possibly do 235/45/18 and 245/40/18 and that would be close, but again probably not worth the risk. On a 18x9 vs 18x10 you can usually put a couple of sizes and still have it work. You might be able to do 235/40/18 on both. You need to make sure that the offset is also good because I don't think 245 will fit and even 235s need a high offset. Keep the overall tire height with wheel is the most important.
ya i wasn't suggesting those sizes just giving an example but yes you are correct, that last sentence is key. also wider rear tires in rear will cause more unnecessary understeer and the awd will handle the launch so just get the same size front and rear.
 
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