Cane Creek 40 Series ZS49 Headset The 40-Series is the workhorse line of Cane Creek's headsets. The 40-Series borrows design features from their premium 110-Series, incorporating all the features necessary for a durable, light-weight, long-lasting headset that represents the perfect balance of performance, durability and value. You are looking at a 40-Series Zero Stack Conversion Complete Headset for 49mm Head-Tubes, 1-1/8" Straight Steerer. Features Compatible with straight 1-1/8" steertubes Compatible with 49mm headtubes Durable, long-lasting bearings | Cane Creek | 40 Series Zs49 Headset | Black | 49Mm, 1 1/8"