ENBO RD-TY21B 6/7 Speed Bike Rear Derailleur Direct Mount for Mountain BicycleThis RD-TY21B Direct Mount Rear Derailleur for Mountain Bike, not Hanger mount. Specifications: Total capacity 34TLargest sprocket 28TSmallest sprocket 14TFront chainwheel tooth difference 20T Weight: about 265gmCycling is a great outdoor sport for your health, the bicycl..