B1CO8867 WHEEL-TURF, 9X3.5X4, SOLID, WHITEOne New Aftermarket Replacement 9x3. 5x4 Solid Turf Wheel Assembly for Velke Sulky This solid foam turf wheel assembly is a direct replacement for all single wheel Velke sulky models. The 9x3. 5 4 flat free tire is mounted on a 3 piece white painted rim with a 3 1 2" centered hub and 3 4" open cage roller bearing with grease zerk fitting. No air pressure needed the solid foam construction eliminates flat tires during commercial mowing operations.