There are at least a couple of answers to your question. Let me do my best here:
1. the steering angles and geometry of your truck is mostly set and not adjustable. In fact only caster angle and toe-in/toe-out are adjustable. If you go to a 15 inch wheel and keep a more thin tire on it, you won't notice the changes too much. (edit...thin meaning thinner tire section width). If you go to a wide tire, you will notice changes. Things like scrub angle, camber angle and a few other things won't like a wider wheel which has a center point different than your stock wheels had. Driving in town or in a parking lot with wide wheels will not be as easy. The closer you can stay to a narrow tire that is 28" in diameter the happier your steering will be.
2. your speedometer won't be as correct as before, but honestly it won't be off by much and not enough to worry about. Your original 600 x 16 inch tires were 28 inches in diameter. If you stay close to that, you'll be ok. If you go with one of the wide, low rubber-band looking tires a whole lot of things will change.
3. If you use tires that are much too wide, please make absolutely certain you don't have interference with tie rod ends or any other steering components. A friend did this against much advice and ruined two tires very quickly. Also be certain you don't have fender clearance issues.
I've used 15 inch 6 lug wheels for decades. Nowadays I use 205/75 R15 Hankook Optimo tires which are about 7.5" wide. It all works well, but even the added 1.5" is noticeable in turning effort. I wish it wasn't, but I have to be honest about that. That tire is about 27" in diameter. A friend of mine used a 235 15 inch tire and there's noticeably more effort in steering with those...in town. Not quite as much at 55 mph.
Hope this helps.
Last edited by Jon G; 06/26/2024 4:46 PM.
