Wheels of the serie PG are made of a cast iron Wheel centre with a vulcanised polyurethane Wicke – Topthane® 92 Shore A tyre. The Topthane® tyre is bonded to the Wheel centre with a special bonding agent. The tyre is abrasion resistant with low starting and rolling resistance. The tyre is cut proof and has good tear strength. The Wheels are with ball bearings.