Standard Track Width 620mm Combi Wheels Pneumatic wheels Y Wheels & Adapters Track Width 805mm (Crab PeeWee IV) Combi wheels Pneumatic wheels Y Wheels & Adapters Curved Tracks 620mm / Diam min. 6m Combi wheels Pneumatic wheels Y Wheels & Adapters Curved Tracks 620mm / Diam min.: 4m Y Wheels & Adapters