If the Envoy is anything like our '05 GMC Sierra, you'll be limited to a +1 or +2 size, that is just a size or two over stock. Our GMC 2wd came with 245/70-17s and I have run both 265/70-17s and 275/60-20s which equate to approximately a +1.5 size. HTH


1987 Raider - Roxy
1988 Mighty Max 2.6L Turbo - Pearl
1997 Mountaineer V8 - Freddy
2000 Excursion V10 - Freya