Sea Sucker Compact 4. 5 Rear Wheel Strap and Vacuum Pad Replacement Parts For Sea Sucker Racks The Sea Sucker Compact 4. 5 Rear Wheel Strap and Vacuum Pad is a replacement part for Sea Sucker racks. The smaller diameter 4. 5 cup is for tighter spaces, should the 6" cup be too large for the application. It does NOT have the cupped rear wheel housing that comes standard with the regular Rear Wheel Strap. The 22" length will fit most fat bike tires. Features Smaller diameter 4. 5 cup for tighter spaces should the 6" cup be too large for the application Does not have the cupped rear wheel housing that comes standard with the regular Rear Wheel Strap22" length will fit most fast bike tires | Sea Sucker | Seasucker Compact 4. 5 Rear Wheel Strap And Vacuum Pad Wheel Strap And Vacuum Pad