What are the largest tires that can get crammed in here without a lift or modification?

I rarely take my vehicles off-road too hard, but do a lot of snow travel during the winters. I've run BRG AllTerrains on both of my prior trucks (86/94 Broncos) and I really don't like the Goodyear Wranglers on the Tahoe now: too slippery in the rain and with 25k on them, I want to get some tires before the winter.

I have 17" factory 2004 tahoe rims and 265 75 17 . The 285s are too big in my opinion without lifting. I have old body style Z71 2000 year. The 265 is perfect in my opinion, having bought mine with 285s.

check my pics...I got some Pro comp..305's stuffed under mine with no lift..dont think I would do any hard core off roading untill I lifted but they fit fine..