Max Tire Size with Leveling Kit

[1500_GA]

Good afternoon.  Last week I bought my first GMC.  It is a 2018 Sierra 1500 crew cab 4x4 with the 6.2L V8.  Years ago I had a Ram so I am new to this forum.  I have been looking to buy the Bilstein 5100 leveling kit (which I had on my '06 Ram and loved) for the front and put it at max setting.  I will also replace the rear shocks with 5100s as well.  My question is what is the max size tire I will be able to fit after I level at max setting?  I called my local 4WP store and they said I would have to keep stock tire size unless I went to 4" suspension lift.  I have seen many posts with folks putting 275/60R20 and some with 275/65R20  tires but could never find a consensus on what is the max.  Any help is appreciated.  I look forward to many more mods for my new truck!

[amxguy1970]

There are countless threads on this (probably the most commonly asked question on any forum), if you search you will find many answers. I will give some help, here is the Bilstein thread with tons of information. Have fun, when pushing tire size many variables matter...

 

 

Tyler

[L86 All Terrain]

I am running a 33x12.5R20 on stock +27mm Snowflake wheels which is a really fat boot for these trucks and that wheel offset. Little rub on sway bar and UCA but unnoticeable during daily driving unless you're cranking full lock to stall park. My friend runs a 305/55R20 on a Silverado with no rub. As long as you stay under 34" you can basically go as wide as you want as my tires are pretty much a 315 section width. Im on an RC level, not lift shocks but if you can get a true 2.5" from them you can fit everything I can.