If your truck is a 4x4 you want the tires to be the same diameter front and rear. In the debate with 19.5's on steer, drive and all position, there are many opinions out there. Some will say that steer tires need to be on the front and drive on the rear. I've actually contacted a Michelin specialist and asked this very question. He stated that in our application, it really doesn't matter. You won't explode and it's not like taking the sticker off your mattress. The Government won't come to your house and fine you.

I put these Firestone FD 690 plus tires on my truck. They are drive tires, but they have closed shoulders, and are rated for mud & snow. They are very quiet and IMO, a very good compromise between steer and aggressive drive tires.