It'd be tight, but there is room between the wheelwell and the front of the box. I have a 29" tall tire in there right now. The only problem you might run into is the height of the hold down would be 18.5" up from the bed floor. That's getting close to the top of the box side...
I'd say a 35" would fit for sure, even a 36 is pretty likely...but a 37 might be pushing it.
Rene
I'd say a 35" would fit for sure, even a 36 is pretty likely...but a 37 might be pushing it.
Rene