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The new size tire would be larger in height and diameter. I thought maybe a different size of temporary "space saver spare" should be used. Shouldn't the diameter and circumference match? If tire height/revs per mile doesn't match from side to side, isn't it hard on the differential(s)? see comparisons. The first is the original spare. 245/40-19 vs original spare 245/40/19 vs upsize spare
Personally I wouldn't be concerned with making the spare tire the same diameter as your up-sized tires on the car....unless you plan on driving on the spare for an extended period of time, which I rather doubt you would.
Seriously? .1 inch is so negligible. I bet you have at least that difference with current tires, because your current tires have worn down over time and the spare has full tread, probably never used.
Even if it was .5 inch difference it would not matter, it's a spare, and your only going to be driving so far with them.
More importantly check the tire pressure of the spare, mine was 15 psi and supposed to be 60 psi when I checked for the first time ever, it looses air over time, and nobody ever checks it.
Seriously? .1 inch is so negligible. I bet you have at least that difference with current tires, because your current tires have worn down over time and the spare has full tread, probably never used.
Even if it was .5 inch difference it would not matter, it's a spare, and your only going to be driving so far with them.
More importantly check the tire pressure of the spare, mine was half of what it was suppose to be when I checked for the first time ever, it looses air over time, and nobody ever checks it.
Uh, it's 1.1" diameter, and 3.7" circumference difference. The .1 inch difference is if the spare was upsized too. Of course I wouldn't plan on driving too far on the spare, but you never know. You could be caught far from a repair place.
Uh, it's 1.1" diameter, and 3.7" circumference difference. The .1 inch difference is if the spare was upsized too. Of course I wouldn't plan on driving too far on the spare, but you never know. You could be caught far from a repair place.
I glanced over it, yeah, that doesn't matter, as long as it's a properly inflated spare tire.
The donut is already smaller than the stock tire size anyway so +1 size won't matter much. Plus the donut is there to get u rolling to a nearest tire shop and 99% of the time u won't need it.
I always keep my display showing my tire pressure so I know if one tire is loosing air faster than the others and I can drive to a tire shop before it goes completely flat. Having a tire inflator helps too.
More importantly check the tire pressure of the spare, mine was 15 psi and supposed to be 60 psi when I checked for the first time ever, it looses air over time, and nobody ever checks it.
Excellent advice. It's a good idea to add air to the spare once a year - once every two years at the least. I'd recommend pumping that spare up to 75 psi because it will lose pressure over time and I'd rather have it carry too much pressure, than not enough...
The donut is already smaller than the stock tire size anyway so +1 size won't matter much. Plus the donut is there to get u rolling to a nearest tire shop and 99% of the time u won't need it.
I always keep my display showing my tire pressure so I know if one tire is loosing air faster than the others and I can drive to a tire shop before it goes completely flat. Having a tire inflator helps too.
Did somebody mention donuts? I love donuts...and milk!!!
12-04-19, 07:01 PM
