Part Number: 2771HP4A39-01
alpha Racing high performance rear sprocket manufactured from enhanced 7075 T-6 aluminum that is 35% lighter than steel to further reduce weight and increase power transfer without sacrificing strength, hard anodized in silver color, T39, pitch 520, for BMW HP4 racing wheel. These sprockets are CNC-machined (not stamped) and feature a computer-aided “Ultra light” design to reduce unsprung weight and increase power transfer. These rear sprockets also feature a specially CAD designed tooth profile that allows the 520 chain to roll easily on and off the sprocket for longer wear, less noise and more power. HP4 sprocket centering diameter is 70mm, hole circle 100mm, 5 holes, and diameter is 12mm.
Weight: 0.28 kg. Note: BMW S1000RR Stock Gearing: 17-45.
Benefit from the unrivaled racing knowledge of alpha Racing in Germany and their professional experience in World Superbike, World Superstock, German IDM Superbike Championship, FIM Superstock Cup 1000, and 24 Hour Endurance Racing by using genuine alpha Racing Performance Parts.