WTB Pure Saddle Chromoly Black Medium keyword search Fat Bike Double or Triple Double Drivetrain Double or Triple Double Drivetrain Speeds 12 Derailleur Capacity 16 Front Derailleur Clamp Braze on Front Derailleur Cable Pull Electronic Front Der Shifter Compatibility Shimano Road Di2 Max Ring (teeth) 55 Front Derailleur Style Traditional The resin ribs on the back of the chainrings are Shimano 105s unique structural design that achieves both through weight reduction and crisp shifting performance The distinctive rising whale tail shape is one of the many features that make it excellent saddle for bikepackers and trail riders padding:8px