Credit goes to wahoo (http://jeepgarage.org/member.php?u=8581
) and this thread (http://jeepgarage.org/showthread.php...light=duratrac
) for planting the seed and blazing a trail for us QL buyers who wanted some proper tires. As everyone has agreed, these tires look awesome on the GC.
For anyone interested, I used a bit of trial and error with a tire size calculator and came to the conclusion that a 255/70-18 spare should fit in the rear compartment and almost exactly match the diameter of the 275/65-18 Duratracs.
I was about to have a set of Duratracs put on my GC and wanted to be sure I could still have a useful full-size spare to work with before I put them on. Discount Tire has a nice tire size comparison calculator on their site, and it helped me find what I hope to be a good solution.
The BFG Rugged Terrain T/A P255/70R18 112T ORWL (as straight from Discount Tire's site) has a diameter within .01" and a cross section narrower by about .8" than the 275/65-18s. Also there aren't any sidewall tread-blocks which should help clearance.
I saw some guys mentioning that they fit 265/65-18 Wrangler SilentArmors in the back and could still close the floor; at least one bin having to get pulled though. This BFG has the exact same cross-section width as the SilentArmor mentioned, but the diameter of the DuraTrac 275/65-18.
I don't really care if the bins are in there or not, personally, as long as I can get my VIAIR 300P and other recovery equipment stuffed around it.
That does remind me, a VIAIR 300P plus it's hose does fit in the space one of the storage bins would take up. You can't use the carrying bag, but it's a nice upgrade with much higher duty cycle over the 90P that a lot of others have recommended. This isn't taking into account the larger BFG in there, but it seemed to have some room to spare (pardon the pun) with the OEM tire, so it should still fit with the larger BFG in there.
I've had the Duratracs on for a few days now. So far I really like them. Road noise is obviously increased, but it's completely tolerable. It is after all a true off-road/on-road tire; compromises must be made. With the windows up I don't even find myself turning up the stereo any louder than I had it before.
They seem a little more sloppy handling-wise than the OEM tires, but once again, typical compromise for this kind of tire. By no means do they feel unsafe. I'm sure I'll be praising them during the snow season in the Colorado mountains this winter.
I'm running 40psi right now (per shop recommendation) and going to see how they wear in the first 5k miles.
I ordered the BFG tire and should be getting the spare mounted this Friday. I'll let everyone know if my calculations all worked out, and post some pics.