Hey i've just put on two 245/45/17's on the rear of my '91 skyline gtr.
previously i had 245/40/17, two of which still remain on the fronts. Now im wondering, can i hurt anything here by having 2 different sized tires? I don't want to cause damage to the active AWD system or differentials.
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Re: different tire sizes...
I've always heard that it is ok to put different size tires on the front and back as long as the vehichle is not AWD. The two different size tires turn at different rates and can cause problems for you. I would probably change the other two.
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Your tire sensors are sensing different size tires./ Your tires are rotating at different speeds because of the size difference. put the same tires on the front axle if front wheel drive. and the same tires on the rear if rear wheel drive. be sure to match tire pressure.
The noise is most likely caused by the different wear pattern on the tire that came from the rear of the car. The difference in the alignment between the front and rear suspension systems causes the tires to wear accordingly. It will take some time for the tires to wear in to their new environment. The noise should go away gradually. You should also check your tire pressure to make sure you don't have an improperly inflated tire.
both tires will fit on the 15 inch rim But be advised make sure you have same size tires on the drive wheels being as your car is front wheel drive u want both the front tires to be the same size if this is not done u will burn up your transmission if you have to put a odd ball tire on put it on the rear
exact opposite is true for rear wheel drive car on a rear wheel drive car u want both rear tires to be the same size
Tire A: 195/65 R 15 (25 x 7.68 x 15)
B: 215/60 R 15 (25 x 8.46 x 15)
There is a sticker inside your drivers door that lists the stock tire size. This is always the best bet. On line is a web sight from tirerack.com that has explanations of tire sizes, tread ratings and on....
When resizing tires, the best method is +1,-1 or -1, +1. That is, if you add to the width one size (i.e. 235 -> 245), then you need to go down one aspect ratio (i.e. 40 -> 35). So if you run 225/40ZR18 tires and want to keep your speedo accurate, 235/35ZR18 works for a "plus one" and 215/45ZR18 will work for a "minus one" change. This way, your impact on speedometer accuracy is minimal.
It is true that driving with different size tires can damage the transfer case, depending on how long it was driven like that. But--- even if the tires are the same size it can cause this. if the tires are worn and two tires are new the circumference of the tires must not be more than 1/2 inch difference from each other, take a tape measure and put it around the tire in the center and measure the difference of each tire