nvdiesel

I've got a 2500 tradesman. The factory wheels including the spare are 245/70/17. I just got a set of factory aluminum wheels and tires taken off a new truck. They are 275/70/18. The dealership tells me that all Rams will have a 17" steel wheel for a spare and a different height tire to match the circumference of the factory premium wheels. I don't live close to the dealership. So whoever has 275/70/18 on there truck from the factory what tire does your spare have mounted on a 17" wheel? Thanks.

BarryG

Well I have 2017 3500 srw bighorn. That is not the case on my truck. Steel wheel yes but it was an 18 inch wheel and tire was same as the other 4

1-2-3

The outside diameter for a spare is all that counts when you need it. it will however keep you from using the best 18 as a spare on a 17. Keep in mind too the lug nuts. they may be different for the new wheels and you may need to keep a handfull for use with the steel spare. wrench size may be different too

nvdiesel

Went to the dealership today and looked under some new trucks. One with the factory aluminum 275-70-18 had a steel wheel with a matching tire. One with the black 20" alloys had a 18" steel wheel with a 275-70-18 tire. Hows that going to workout?

1-2-3

Its just the outside circumference that matters. Rim size means nothing. It can be a 13 inch rim and still work as long as the circumference is the same.