What does 305 mean in tire size?
John Hall
Updated on May 15, 2026
305/50R20 tires are 32.0″ tall, have a section width of 12.0″, and fit wheels with a diameter of 20. The circumference is 100.5″ that translates into 630 revolutions per mile. As a rule, they can be mounted on the wheels with 20″ x 8.5-11″ rim width.