I've got a 2001 cummins and I am getting ready to purchase a new set of tires. Wondering what is the largest size that will fit under the truck in the spare tire cavity.

 

with my hitch receiver on the truck seems like I can only barely carry a stock one.

 

A 285/75R16 will fit if you deflate it a bunch and convince it to get up their. Then you'll need something to inflate the tire if you need it.

 

I carry a 285/75/16 BFG AT under my 2001, inflated 50-60 pounds on the stock spare rim. My 2001 is 4wd, with a 4" aftermarket exhaust. No problems.

 

Thanks guys!

I've got 285's now and a 245 spare. For 4 wheel drive I desire a matching spare. Leaning towards 265/75-16 BFG TA KO's. Combination of works and play vehicle. Need good traction for hunting and decent longevity for work.

 

Goodyear DuraTrac's will give you that, as well as great winter traction.