Frame : Ultra Light & Sturdy Aluminum Alloy 6061 Fork : ZOOM Suspension 80mm Travel With Lock-in & Lock-out Brakes : ZOOM F/R Alloy Mechanical Disc Brakes Shifting : 21-Speed SHIMANO EZ-Fire Derailleur : SHIMANO Altus RD-M310 & FD-TY500 Freewheel : SHIMANO MF-TZ21 7 Speed Hyperglide