[Benjamin]

Me and all my buddies ran 31 x 10.50 on the rear of our 67-72 C10s in high school, no problem, but I had 235/75/r15 on the front. For comparison that is approximately 29" tall and 9.25 tread width. Can't remember if the 31 x 10.50 wouldn't fit on the front or it was an issue of not being able to afford them for front and rear.

The C20 is a different story, I feel like they ride a littler higher. I would ask around and take some measurements, but I would think MAYBE, just maybe, if you aren't lowering the truck you might be able to fit 31 x 10.50 on the front and (gasp) 33 x 12.50 or 33 x 10.50 on the rear. Also, I'm guessing you have a 16 inch wheel on the C20, so you may need to figure out metric equivalents.

Just like carpentry, measure twice cut once. The best thing to do is lurk on the forum and Instagram until you see a C20 with a stance you like, then get the wheel-tire combo specs from the owner.

Board member cheyenne shortstep (aka tremaynes_trucks on instagram) has a few C20s, he might be able to tell you what wheel-tire combos he is running.