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Old 12-16-2015, 01:18 PM   #1
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Spare tire size

Hello all,

My 2 axle TT came with 205 75 14 tires and wheels. This spring I'm most likely going to put on 205 75R 15 tires and wheels. The difference in tire ht is 1 inch. So that means only a 1/2 inch difference on each side of a diameter measurement. What are your opinions about keeping the 14 in spare tire and wheel?

Thanks,

Dale
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Old 12-16-2015, 02:06 PM   #2
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Rethink this; use this tire size comparator to see exact differences in these sizes. It shows 3.14" difference in diameter. What you see as a 1" difference is rim size NOT tire diameter. So when you install the 15" tires, tread will be 3.14" closer together too.
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Old 12-17-2015, 10:31 AM   #3
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Quote:
Originally Posted by Ray,IN View Post
Rethink this; use this tire size comparator to see exact differences in these sizes. It shows 3.14" difference in diameter. What you see as a 1" difference is rim size NOT tire diameter. So when you install the 15" tires, tread will be 3.14" closer together too.
Thanks, that's a cool chart. I bookmarked it into my tire section. The chart reads the 3.14 as a circumference difference. The diameter, tire height, difference is 1 inch. Easy to mix up. Thanks,

Dale
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Old 12-17-2015, 09:59 PM   #4
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My bad, I misread the data, sorry.
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Old 12-17-2015, 10:09 PM   #5
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Ray, Thanks for the link to the chart, pretty neat
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Old 12-18-2015, 01:12 PM   #6
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More tire options in 16" if you are going to change.
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Old 12-18-2015, 02:43 PM   #7
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I would leave the spare tire as is, unless you come up with a spare rim and tire for free. Having a size difference is really only an issue on an axle that's powered, like the rear end of your truck. You don't want to mix sizes on drive axles. Using the smaller spare on a trailer axle, for emergency use, is not a big deal.
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