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Old 11-07-2018, 09:34 PM   #51
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Join Date: Dec 2012
Location: Edmonton, Alberta
Trailer: 1979 Boler B1700
Posts: 11,149
Originally Posted by Brian B-P View Post
The sticker (usually on the driver's door jamb) which provides tire inflation pressures should list the spare tire... but of course the spec can just be read from tire sidewall.
David's door sticker provides the spare specification for his truck: 245/70R18 110S
as well as the normal tires: 275/65R18 116T
These tires have nearly the same overall diameter.

The narrower spare requires more pressure (310 kPa or 45 PSI, versus 250 kPa or 36 PSI) to carry the same load. The spare has lots of speed capacity, but the mismatch of having one tire of a different size (even of the same construction) would justify keeping the speed down.

Originally Posted by davidmurphy02 View Post
Our "full size spare", temporary use tire was on an 18" wheel and the truck has 18" wheels. But when I went to buy a regular tire for the spare, I found that the spare wheel was narrower and wouldn't accommodate the same size tire as those on the truck so I wound up having to buy both a new wheel and new spare tire....sigh.
That makes sense, because the spare is so much narrower (30 mm or more than an inch) than the regular tires that it should come on a roughly one-inch-narrower wheel. The narrower wheel is part of the weight saving which results from choosing a narrower tire.

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