FH CASS BOX TWO PRIME 9 12-50 E-BIKE BK 9s

Prime 9 Technology is a counter-intuitive philosophy based on the less is more theory - it embraces range without adding complexity

Adding an extra tooth to each of the three highest gears provides increased durability and decreased wear for the heavier loads of E-Bike riding

Compatible with standard HG style freehub bodies

Ultra-wide ratio with consistent progression

Steel Stamped cogs pinned to lightweight spiders

E-Bike optimized 12 tooth cassette gearing