The Rockhopper is a trail-capable machine equipped with Tektro hydraulic disc brakes 29-inch wheels & a Shimano drivetrain allowing you to ride deep into your favourite trails with complete confidence.> Fully butted A1 Premium Aluminium 29er frame with ORE downtube for a lighter more compliant & durable bike> Suntours fully replaceable ring crankset uses Shimanos Octalink-splined bottom bracket interface for reliable power transfer> Shimano Alivio 9-speed rear derailleur & Acera Rapidfire shifters for reliable high-end performance> Smooth-travel SR Suntour XCM-LO fork with preload adjustment hydraulic damping lockout & size-specific spring rates for more versatility & tunability over varying terrain> Tektro hydraulic disc brakes with Light Wave rotors create increased control & superior stopping power for more confident braking