Hybrid sport bike type men wheel size 28 inch model 2017 series specialized ariel frame material carbon frame geometry diamond frame sizes xs s m l colour black braking system disc brake brakes tektro bicycle fork suspension fork fork sr suntour ncx wheel travel 60 mm rear derailleur shimano slx number of gears 20 gear system with derailleur crankset fsa v drive brake type hydraulic disc brake cassette sunrace rear chain wheel teeth