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Post by mattn on Jul 19, 2006 19:00:38 GMT -6
My car has 4 of the P23560R16's on it, but the back tires are bad. I have a almost new pair of P22560R16's, and was thinking about replacing my 2 bad tires with them. I have been told that would be ok by a couple of places, as long as I put the smaller P225's in front and the larger P235's in the rear.
But a couple of other places have told me not to do that.
One shop said that would cause the ABS to work incorrectly, as those tires rotate at different speeds. (I don't understand that reasoning, as they are just different widths, not heights).
Another shop said my speedometer would be off, for the same reason - the tires would rotate at different speeds.
So, any input here on putting P225's on the front, and P235's on the rear?
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exiled350
Aurora Groupie
In the Nervous Light of Sunday
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Post by exiled350 on Jul 19, 2006 20:20:23 GMT -6
being fwd you want the wider tires on the front. the diff in height may cause exagerated understeer in agressive manuvers. as long as they are matched left/right you are fine for the most part, but the height differance and the fact that the two will be smaller than stock may yeild unpredictable results in certian situations.
as for the abs, that would only happen if you put a '35 on one front and '25 on the other front. but that would also cook your tranny and a host of other things much worse than iffy abs. and the speedo would be only be off if you put the '25s on the front as the size difference would cause a change in effective final gear ratio.
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Post by JimW on Jul 19, 2006 21:35:14 GMT -6
Your tranny is geared for 27.1" high tires (235/60R16). I would suggest leaving the stock tire size on the drive wheels. 225s on the rears isnt going to affect anything.
The ratio of 225/60 to 235/60 isn't very much, so don't worry to much. There are several tire calculators online where you can figure out the tire height.
Bear in mind, Scottydl has his OE Bonneville tires+rim combo on his Aurora (225/60/16s) all around and is having no problems.
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Post by TheLoveThatNeverDies on Jul 20, 2006 0:43:31 GMT -6
they are just different widths, not heights. That's a common misconception. As JimW alluded to, the hieght figure is actually the aspect ratio of the sidewall to the width, and is not measured in millimeters like the width is. Therefore, the sidewall hieght of a 235/60 is not the same as a 225/60. |
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Post by luvmybravada on Jul 20, 2006 7:38:24 GMT -6
Right, the 60 is the % of the width of the tire. So it's 60% of 235mm or 60% of 225mm. Once you get that calculation, you have your tire height.
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Post by Marc on Jul 20, 2006 7:55:44 GMT -6
To figure the diameter of a metric radial, use this formula:
width in mm divided by 25.4 X aspect ratio X 2 + wheel diameter
= tire diameter.
Figuring the diameter of the 235/55R-17 on the 2001 - 2003 4.0:
235 divided by 25.4 X 55 X 2 +17 = 27.18" diameter.
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scottydl
Super Moderator 
There's nothin' like an American V-8...
Posts: 7,373
Staff Member
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Post by scottydl on Jul 20, 2006 15:22:59 GMT -6
Bear in mind, Scottydl has his OE Bonneville tires+rim combo on his Aurora (225/60/16s) all around and is having no problems. Did have... when I replaced my tires I went with the stock size 235's. I did run 225's for awhile with no problems, although all four of my tires matched in size and were not intermixed. |
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Post by mattn on Jul 21, 2006 9:37:58 GMT -6
Thank you all for your input. It sounds like I can put the 225's on the rear and leave the 235's on the front without causing any problems to the transmission. I may go ahead and do that. One thing I do not want to do is cause a problem, trying to save a few bucks avoiding buying new set of 235's.
Sounds like the only potential affect might be with the ABS? I am guessing the ABS may activate at times when it normally would not? This does not seem like it would cause any problems?
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scottydl
Super Moderator
There's nothin' like an American V-8...
Posts: 7,373
Staff Member
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Post by scottydl on Jul 21, 2006 10:53:47 GMT -6
matt, I don't think you'll have any ABS problems either since the front tires will match and the back tires will match. Keep in mind that the car's leveling may be a little off, since the rear 225/60's will be a bit shorter than the front 235/60's. It's a matter of 6mm or so in height, so it may not be noticable.
How did you back tires "go bad" in the first place? Usually they will last longer than the drive tires if anything.
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Post by mattn on Jul 21, 2006 11:03:20 GMT -6
Scotty, Thanks for input. I think I will try the P225's on the rear axle. I can pay the $30 or so to try them, knowing I shouldn't have a problem, vs. $200 or more for new Goodyear Integrity original equipment P235's.
The back ones got messed up due to a bad rear wheel bearing, and 2 bad shocks. They are badly 'cupped', and low on tread.
I just put on a new wheel bearing hub assembly, and 2 new shocks last weekend, so now it's time to replace those bad tires. I got a lot of information from this board on how to do both jobs, and the only real hard part was breaking the old hub assembly free. It had become rusted to the break shield and frame. I had to heat it up and bang it with a hammer for about 15 or 20 minutes before it finally broke free.
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Post by mattn on Jul 21, 2006 19:11:34 GMT -6
Just went and had the P22560r16's put on the rear axle. I drove around for a half hour, and did not notice anything different, except that the ride was smoother and more quite than the cupped p23560r16 that I replaced. .
Thanks again to all of you that gave me feedback, giving me enough information to feel this was a safe decision
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