How much is 1%?

sunwolf · March 25, 2015, 12:58:29 PM

I am considering buying these tires http://www.tirerack.com/tires/tires.jsp?tireMake=Michelin&tireModel=Pilot+Super+Sport&partnum=545YR0PSSXL in size 255-45-R20 the diameter of which is 1% wider than stock. I was thinking of maybe only buying 2 and keeping them on the back until my other two goodyears on the front wear out since they might have another 5k in them. If I adjust the tire pressures do you think I will be ok running 1% larger tires on the back? It seems like the back tires hardly wear at all compared to the fronts so hopefully in 5k when I buy new fronts they will be close to new still.

BiGMaC · March 25, 2015, 01:16:52 PM

Likely not enough for you to notice the difference... the stats at Tire Rack should also list diameter and tire revs/mile to give you a better feel for it.

sunwolf · March 25, 2015, 01:21:41 PM

Didn't think about checking the revs per mile. Tire rack says 729 for stock and 716 for the ones I want to get. I think that this difference is probable small enough that it won't matter. Anyone object before I order them?

Frozen Taurus · March 25, 2015, 01:38:45 PM

I have 255/45 on my car now ... never noticed a difference at 1% change

Sorry just read that you want to do only back tires .... I have no experience in that area but I'd imagine that our drivetrain could tolerate a 1% diff

sunwolf · March 25, 2015, 01:40:40 PM

Quote from: Frozen Taurus on March 25, 2015, 01:38:45 PM
I have 255/45 on my car now ... never noticed a difference at 1% change

But I was going to do 255 on the back and 245 on the front until my fronts wear out. Will that make a difference?

SHOdded · March 25, 2015, 01:46:55 PM

Should be fine. I would be more concerned with traction differences, but as long as you stay away from aggressive driving, no problem.

Frozen Taurus · March 25, 2015, 02:10:25 PM

Quote from: sunwolf on March 25, 2015, 01:40:40 PM
Quote from: Frozen Taurus on March 25, 2015, 01:38:45 PM
I have 255/45 on my car now ... never noticed a difference at 1% change
But I was going to do 255 on the back and 245 on the front until my fronts wear out. Will that make a difference?

Should be fine for 5K

BiGMaC · March 25, 2015, 02:12:59 PM

Quote from: Frozen Taurus on March 25, 2015, 02:10:25 PM
Quote from: sunwolf on March 25, 2015, 01:40:40 PM
Quote from: Frozen Taurus on March 25, 2015, 01:38:45 PM
I have 255/45 on my car now ... never noticed a difference at 1% change
But I was going to do 255 on the back and 245 on the front until my fronts wear out. Will that make a difference?

Should be fine for 5K

Many people just run staggered tire sizes... like Mike (bpd)... all the time.

Frozen Taurus · March 25, 2015, 02:33:06 PM

Wasn't Mikes combo under 1% difference? ...still shouldn't matter

glock-coma · March 25, 2015, 03:06:36 PM

I remember someone posting here that the all-wheel-drive system is happy as long as it stays below 3% difference. I can't seem to find the post though.

SHOdded · March 25, 2015, 03:13:28 PM

I think there may be a blurb in the OM as well somewhere.

sunwolf · March 25, 2015, 05:49:18 PM

Well I just bought two of the tires. If there is a problem I can always buy the other two.

SHOnUup · March 25, 2015, 05:58:39 PM

The stealership we got our SHO from sent us on our merry way with a front tire that had a plug in the sidewall that was a "rope" plug. Wicks moisture in and theoretically would rot out the steel belt. After having this pointed out, they only replaced that one. Bums. Anyways, I left there and bought another one to have same size on fronts, rears were maybe 60% tread wear left and car didn't care about the slight difference.

Rich

crash712us · March 26, 2015, 05:57:44 AM

Keep in mind any difference in rolling diameter will cause every part of the AWD system to be constantly work over time. And your reasoning for want to do this looks to insure that this will be happening for many many thousands of miles.

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HtrdMKS · March 26, 2015, 11:46:40 AM

Plus if you take into consideration the wear on the fronts; since you are down to 5000 miles of wear left, the new tires and the old tires may have the same overall circumference.