Zipp Service Course SL-70 Ergo Drop Handlebar - Aluminum 31.8mm 38cm Matte BLK B2Zipp Service Course SL 70 Ergo Drop Handlebar Aluminum 31. 8mm 38cm Matte Black B2. The SL 70 Ergos specially tuned drop shape creates comfortable hand positions with short reach to control levers vital for race situations. Contoured top bar for natural ergonomic grip Drops angled out 4 degrees with 10 degree ramp angle Aluminum 7050 construction 38cm Not compatible with clip ons TECH SPECS Bar Clamp Diameter (mm) 31. 8 Bar Top Style Flat Bar Reach