Dirt Bike / Mini Cross HMParts Sprocket - 3 Hole - 54 Teeth - for 7" Rims : Amazon.de: Automotive
FEZ 6203 C3 2Z Chain Wheel Clamp, 34 Tooth with Ball Bearings (Closed on Both Sides) for Simson S50, S51, KR51 Schwalbe, SR4, Duo : Amazon.de: Automotive