Se bikes big mountain 27 5 20 hardtail bikethe se bikes big mountain 27 5 20 hardtail bike is a trail ready rocket specd with great gear from shimano wtb and tektro featuring a 6061 aluminium frame with a semi integrated headset which is lightweight and durable on even the harshest trails and a shimano tourney 21 speed drivetrain which provides ample gearing for conquering even the toughest climbs tektro mechanical disc brakes provide the added stopping power of disc brakes but with th