Fitment:For Zeda BT80 YD100 49cc 50cc 66cc 80cc 100cc 2 Stroke Engine Motorized Bicycle Package Include: 1 x Spring Loaded Chain Tensioner（Black） 1 x 110L Links 415H Chain 1 x Clutch Gear Drive Sprocket(10 Tooth) 110L Links 415H Heavy-duty Chain are more durable Spring Loaded Chain Tensioner prevents chain burst and breakage. 10Tooth Clutch Gear Drive Sprocket Fit 110L Links 415H Heavy-duty Chain Please confirm the size before purchase to ensure that the product is consistent with the size you need If you have any questions, please contact us and we will reply your information as soon as possible. If you haven't received our reply for a long time, please release the message again