Re: Bigger wheels but only in the rear = good idea ?
When I bought my car, 99 SLS,it had 225s on the front and 235s on the rear. there was a noticeable difference in height between them, and the car didn't react negatively at all. Now, the 225's on the front looked a little small, but I imagine that if you put the stock 235's on the front and went up 1 size in the back it would have the same effect.
Re: Bigger wheels but only in the rear = good idea ?
Quote:
Originally Posted by lownoma18
When I bought my car, 99 SLS,it had 225s on the front and 235s on the rear. there was a noticeable difference in height between them, and the car didn't react negatively at all. Now, the 225's on the front looked a little small, but I imagine that if you put the stock 235's on the front and went up 1 size in the back it would have the same effect.
yeah - but I'm just a little affraid of possible secondary damage.
Re: Bigger wheels but only in the rear = good idea ?
They will rub (7.7" tread width to 10" is a LOT, not to mention the increased section width) and the outside diameter is just about .8 or .9 inch greater than stock, which means your speedo and mileage calculations will be off on the low side. (speedo says maybe 60, you're actually doing something over 61.3 mph.) The larger diameter tire rolls further in one revolution than stock, so the car actually goes farther for a lower speed reading.
Re: Bigger wheels but only in the rear = good idea ?
Quote:
Originally Posted by lownoma18
When I bought my car, 99 SLS,it had 225s on the front and 235s on the rear. there was a noticeable difference in height between them, and the car didn't react negatively at all. Now, the 225's on the front looked a little small, but I imagine that if you put the stock 235's on the front and went up 1 size in the back it would have the same effect.
Those are tires with different widths. That doesn't mean the outer diameter is different.
Re: Bigger wheels but only in the rear = good idea ?
Quote:
Originally Posted by Krashed989
Those are tires with different widths. That doesn't mean the outer diameter is different.
Yes it does.
Tire sizes are designated as such: P235/60 R16
There may be other letters in there, but these are the important ones as far as size is concerned.
Breaking it up, the different codes are:
P - passenger car
235 - Tread width (235 mm)
60 - Series or Aspect Ratio - this is the height of the sidewall as a percentage of the tread width: 60% of 235 mm, or 141 mm
R16 - 16 inch rim
So since the tires were both 60 series, the 225 had a diameter of 26.6" and the 235 had a diameter of 27.1".
It was only a half inch difference, and I didn't realize they were mismatched until I rotated them front to rear. The car looked funny and thats when I checked the sidewalls. Like I said, I didn't have any codes come up, and there isn't any reason that there would be any mechanical wear, you could definitely step up to a 245/60 in the rear and create a little bit of a rake.
Re: Bigger wheels but only in the rear = good idea ?
Quote:
Originally Posted by chubbyranger
The algorithms that correlate wheel speed to suspension control and ABS engagement were all designed with the assumption that all four wheels are the same diameter.
This brings me to a other consideration:
ABS, Traction Control, Stabilitrak and all other features wich works with signals based on tire RPM - there must be a range of tolerance. Otherwhise there would always be a alarm in the system!
We need to know how many RPM's the difference can be before the system react. If we have this number we can calculate the possible difference in tire size.
Re: Bigger wheels but only in the rear = good idea ?
Quote:
Originally Posted by eyekandyboats.inc
get a side picture of you car. i am interested to see this large gap.
As am I ???
Quote:
Originally Posted by mike.nite
Anyone knows the range of tolerance?
Or where could I find this data?
If the difference in gaps is as large and noticeable as you say, then Im sure you would be out of tolerance with the size tires needed to even it up.
Not to mention the fact that it will also bring the "whole" back end up as well.
Then you'd be drivin round lookin like you were attempting to make it look like some kinda street rod.
Is that what your lookin for ? Cause thats the way it will come out.
And that would not be a good look for your Cadillac !!!
Have you even considered the fact that it may be a suspension issue ?
Im glad to see that someone else may also be considering that.....
Thanx eyekandyboats...........
Please post a pic if you can. Cause such a considerable difference that you seem to be describing does not sound normal.
Re: Bigger wheels but only in the rear = good idea ? 
