Bike touring bike type men wheel size 28 inch model 2017 series ortler bergerac frame material aluminium frame geometry diamond bike frame sizes cm 50 55 60 cm frame sizes xl l m colour black braking system disc brake brakes promax tx123d bicycle fork suspension fork fork suntour nex mlo suspension fork feature mechanical lockout wheel travel 63 mm rear derailleur shimano deore xt number of gears 27 gear system with derailleur front