Bike touring bike type men wheel size 28 inch model 2016 series ghost square trekking frame material aluminium frame geometry diamond bike frame sizes cm 47 52 57 62 cm frame sizes m l xl colour green braking system rim brakes brakes magura hs11 bicycle fork suspension fork fork suntour cr 7v wheel travel 40 mm rear derailleur shimano alivio number of gears 27 gear system with derailleur groupset shimano front derailleur shimano f