8X300X4 Solid Foam Tire, 3 1/2" Centered Hub, Zerk Fitting with 5/8" Open Cage Roller Bearing. Replaces Walker 5715-3. Uses Rotary 8864 Solid Foam Tire. (Painted White). TIRE SIZE: 8X300X4. HUB LENGTH: 3-1/2".
eBay