Is 265 50R20 a common tire size?

Is 265 50R20 a common tire size?

The tire size 265/50r20 is a common size used on many trucks, suvs, and other larger vehicles. The 45-50 number is the aspect ratio of the tire, bigger the number the larger the sidewall. Though in this case, the difference is small, around an inch, but still affects final drive ratio as other have mentioned.