gorskimc

My Dad put my wheels and tires on his 17’ Silverado. He had plain Jane wheels on it before.

I've always used top mounted spacers. The bottom mounts look a bit sketchy in my view. The top mounts use their own studs (the stock studs get buried in the spacer) so I've never had to cut the stock studs - but then I've always used a 2 1/2" kit. I guess a thinner spacer may cause the studs to protrude through the top of the spacer, and require you to cut them off. I think that the top mount is the way to go, even if it costs a few bucks more.

I recently upgraded from my 2017 Sierra 1500 SLT to a 2019 Sierra 1500 SLT. So of course I did my usual upgrades: window tint, spray-in bedliner, 2.5" level kit and Fuel Beast 20" wheels with 305/55R20 rubber. I did the level kit(s) over the weekend and put the new wheels and tires on. I think it looks much better now. I just left Belle Tire getting the front end re-aligned, so I should be good to go. I do have a slight tire rub at full lock at the rear of the wheel well, so I'll have to trim back the plastic/carpet in that area. Other than that, it looks great. The level kit was a Motofab 2.5" in the front, and a Motofab 1" in the rear. For some reason, the 1" in the rear gave me a lot more than that though. Prior to the leveling kits, my front height (ground to bottom of fender flare) was 36.875" and my rear height was 38".50". After the leveling kit, my front height is now 39.50 (increase of 2.625") and the rear height is 40.75" (increase of 2.25")

Yep. You're right. I did the calc's with a 60 aspect ratio instead of 65. The 275/65's are actually just over 34" diameter, as you stated. So, now the question is taller or wider? Do you go with 34" diameter and a 275mm (10.8") wide tire or a 33.2" diameter and a 305mm (12") wide tire? What does everyone think looks the best?

I'm just curious why you stayed with 275/65's instead of going with something wider? Maybe a 305/55R20? The diameter is only slightly different (33" with the 275/65's vs. 33.2" with the 305/55's.) I suppose there is more patch contact area from a 305 vs a 275, so you will get a little more drag (ie. less fuel mileage) but I personally just think that the wider tires look so much better on a lifted/leveled truck. From everything I've read it seems like the 305/55R20 will fit on a truck with at least a 2" level. There is a possibility for a very minor rub at full lock, but if it does it would be minor. Some people have stated they had a 2" level with zero rub on the 305's. I just picked-up a 2017 GMC Sierra and put a 2.5" Motofab level kit on it, and am planning on putting 305/55R20 K02's on it in the next week or two. I was just curious if there was a fit issue that prevented you from going wider, or if it was just cost and fuel mileage. Your truck looks great though! I've always like BFG's for all around tires. Not too noisey on the highway and great off-road in the woods.