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Old 01-18-2016, 01:13 PM   #11
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An inch difference in diameter makes a bigger difference on circumference. It could possibly affect your TT braking. I recently noticed something on tires that I have not seen before. Two different brand tires, same rim size, same tire size and rating, were a significantly different diameter. I thought there were standards throughout the brands.
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Old 01-19-2016, 07:54 AM   #12
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need a spare - its advisable yes
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Old 01-21-2016, 09:08 AM   #13
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When I swapped my 14" for 15" I purchased a cheap steel wheel for the spare; versus aluminum for the regular wheels to save money.
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Old 01-21-2016, 09:36 AM   #14
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I take a different tack than most above posters.

If you're just going to use it as a spare to get you to the next tire place, and not in regular rotation then I'd say it'd be fine. The spring 'equalizer' will adjust to keep the loading the same between the tires on the same side. And the little bit out of level it'll make the RV isn't going to matter.

I wouldn't run it like that normally, but as a spare, it'll be fine.
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Old 01-21-2016, 09:48 AM   #15
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Quote:
Originally Posted by Bama Rambler View Post
I take a different tack than most above posters.

If you're just going to use it as a spare to get you to the next tire place, and not in regular rotation then I'd say it'd be fine. The spring 'equalizer' will adjust to keep the loading the same between the tires on the same side. And the little bit out of level it'll make the RV isn't going to matter.

I wouldn't run it like that normally, but as a spare, it'll be fine.
Agree, using the slightly shorter wheel/tire combo for a spare will be fine. One inch difference in aspect ratio (overall height) is only 1/2 inch of mounted height.

Make sure your upgrade to 15"s has 0 offset so as not to affect bearing wear. Maybe take it one step further and carry two spares of the same size then simply change both tires on the same axle and the equalizer will compensate just fine.
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