![]() Mount the donut/full size spare that hasn't been in rotation and you now have turning and shifting problems? That's shocking to me. Lose 2/32" of tread depth and you have lost 0.125" in diameter and 0.393" in circumference, which is more than the acceptable 1/4" difference mentioned in the tech bulletin. So losing 1/32" of tread is a loss of 0.06250" in diameter and 0.196" in circumference so you are ok. Tread depth is usually measured in 32nds of an inch. So a loss of 0.04" in tread depth will mean a loss of 0.08" in diameter and 1/4" in circumference. How much tread loss do you need to have before you lose 0.08" in diameter? Any loss in tread depth needs to multipled by 2 to figure out impact on diameter. ![]() That's a change of just 0.08" in diameter. Working back to diameter, that means if your original tires have worn down from original 28.7" diameter to 28.62" in diameter, you are in trouble. Subtract 1/4" of circumference and the magic number at which your tires won't play nice with an donut/full size spare that hasn't been in rotation (or a new tire) is when they reach 89.914" in circumference. 6 (just narrower)Ī little geometry says that if a tire's diameter is 28.7", its circumference is 90.164" (pi x D). I understand the donut has the same diameter on the Gen. Per Discount Tire, the stock Yokohama Avid GT in 225/60R18 has an overall diameter of 28.7". Definitely coming to see the maintenance manager at my dealer and definitely looking forward to get them to fixed this asap! I know I am on that free tire for life program so i don’t know why the mechanic would have left that brand new full size spare tire on, since it has never been used nor rotated.Ĭlick to expand.A 1/4" difference in tire circumference causes turning problems and shifting problems!? Somebody please check my math, but I think that 1/4" difference in circumference works out to something less than 2/32nds in lost tread depth! If that's true, most of us are probably driving around on tires that are too worn to work if we have to mount the donut, or a full size spare not in rotation, or a new tire (without shaving). Today while driving to work i felt like my car was out of alignment, and what i noticed is that my spare tire was rotated to the front and the puncture tired was placed in the spare tire bin and it was flat (again). When checking out the service advisor informed me that they were able to fix the tire as the nail puncture was fixable ( i guess). The performed the 24,000 mile service which includes the oil change and tire rotation etc etc. I went there for my appointment on thursday the 11th of March. I then called my subaru dealer and made an appointment to have them take a look at it, to see if it could get fixed, the customer service rep also convinced me to get my 24,000 mile service, since it was almost due. So I put the spare tire on (which in the onyx is a full size tire). Well, I am facing a issue with one of my tires, this past monday Mar 8th, I went to get in my car to go to work in the morning and I had a flat tire, it was my rear passenger tire and it had a nail!. Looks like I will be doing some trimming on the foam so that it fits and it does not appear that it will take too much trimming. An alternative may be just to wrap the jack & tools in a blanket and stuff them in the wheel center.Īpparently the foam Jack Holder fits on the Onyx full size spare tire but it did not fit on the wheel from Discount Tire. ![]() It may take some trimming on the foam piece to make it fit the 17" wheel. The foam Jack Holder is made to fit the 18" wheel, not the 17" wheel. The full size tire fits fine but when I attempted to put the foam 'Jack Holder' in the center of the wheel I found that it didn't fit. ![]() Update-Today I replaced small donut temporary spare tire with a 225-65-17 full size tire on the generic wheel (Stock #49027) I had gotten from Discount Tire. You can go online to the discount tire website, type in year, make, and model of the car and it will list wheels available for your car. Ralphtt-The spare wheel from Discount Tire was a generic, steel wheel but they also have an aluminum alloy wheel. ![]()
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