The Topeak Tri-Backup Tyre Bag. Long days in the saddle training and racing take their toll on your equipment. Tri-BackUp TireBag provides protection from harmful ultra violet rays that can quickly degrade a tubular tire. So the next time you have to replace your tubular tire, it’s ready to go. Designed to integrate with Tri-Backup Pro V and Tri-Backup Pro I for maximum aerodynamic efficiency. Topeak Tri-Backup Tyre Bag Features Provides protection from harmful ultra violet rays that can quickly degrade a tubular tire Designed to integrate with Tri-Backup Pro V Designed to integrate with Tri-Backup Pro I