38 Teeth Fixed Chainwheel With 14 Teeth Motor Sprocket And 70 Links #420 Bicycle Chain For Electric 3-wheel Bike Axle 31mm : Amazon.co.uk: Sports & Outdoors
JT Steel Rear Sprocket | Pitch: 428 | Teeth: 38 | JTR269.38 - Brooks Barn
1Pc (Type 10A) Standard Single Drive Roller Chain Sprocket Wheel 30-38 Teeth Power Transmission Chain Sprocket Gear, 31 Teeth-Hole diameter 163mm : Amazon.co.uk: Automotive