YAHILL 1pc MTB Mountain Road Bike Cycling Soft Wheel Bag, Transport Cover Bag, Bike Travel Cases, Carrier Bag, Wheelset Bag Wheel bags are a great way to keep dirt. Wheel bag for Road or MTB Bike. Padding on the inside to protect your wheels. Provides a safe and effective way to store your wheel sets. The Wheel Bag is 28.7inches in diameter.