Set of 2 - 18 X 9.50 - 8 Knobby Tire and Wheel assemblies. 4 on 4 Bolt Circle, 2.56" Pilot Hole. With this knobby tread, you can mow those slopes, or tackle uneven terrain in your golf cart or UTV with confidence! This product can expose you to chemicals including Naphthalen and Butadiene, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.