16” Tires on C20

[Mike C]

235 85 16 and 265 75 16 are virtually the same height just different width. Either is a good choice, but I prefer the wider tire look. If you plan on running a 6” rim I would stay with the 235 although lots of 265 installed on the 2000-2008 GM 6.5” rims. I ran 265 75 16 0n my ‘70 C2500 on Alcoa super single forged wheels and it looked fantastic. The math, if you are interested:

265 is the section width in millimeters. There are 25.4 mm per inch. 265/25.4= 10.43 inches wide. The profile is 75% of the section width: 10.43 x 75=7.825” sidewall height. Times two for the bottom of the tire and top of the tire = 15.64 inches high. Added to the 16” rim diameter you have a tire 31.64” tall and 10.43 inches wide.

235 85 16 tire is 9.25” section width and 31.72” tall.
245 75 16 is 9.64” wide and 30.4” tall
285 75 16 is 11.2” wide and 32.8” tall.