Current 16+ 33 Inch Tires 20 Inch Rims. What's the biggest tires you can fit on stock 20's 2019 ram laramie? I have 22inch rims that i bought for my tb and they are still. Hey guys just wanted to make a video showing how my 20x12 moto metals with 33x12.50x20 arturo trailblazer m/t sit on my leveled ram 1500. 20 inch rims is our most popular product, we sell 20's or dubs for cars, trucks, and many sport utility vehicles.