1977 NASCAR International Stock Car Racing Rule Book NASCAR Grand National ® Championship Division Section 20-27 -- Wheels

a. Wheels must be reinforced. Only NASCAR approved steel wheels permitted.

b. All four wheels must be same design, size and diameter and same offset at all times.

c. Hub caps must be removed.

d. Any stock appearing steel hubs may be used.

e. Heavy duty lug bolts must be used.

f. Fifteen inch diameter wheels permitted, but all four wheels must be same size at all times. Maximum rim width 9 1/2 inches.