Our patented shaft drive technology delivers an extremely smooth and safe ride with low maintenance and no mess. Dynamic uses a more advanced shaft drive using spiral bevel gears in a lighter weight and more compact design. * Internal Gear Hubs provide fast and seamless gear changes, with shifting independent of pedaling * Dynamic fully tunes every bike before it is shipped to our customers - including truing the wheels, setting the brakes, inflating the tires, testing the gearing, and adding your selected accessories. Dynamic"s frames use an aircraft grade 7005 aluminum for strength, light weight, stiffness and durability * Frame: 6061 Aluminum Gearing: Shimano Nexus 8-speed premium internal hub (range of 18-gears)Shifter: Shimano 8-speed Twist Grip Crankset: Forged alloy crank arms Front Fork: RST suspension front fork with 2" travel Brakes: Tektro alloy linear pullBrake Levers: Tektro alloy 2-finger Rims: Double wall alloy Transmission: Sussex 4th Generation Shaft Drive System * Handlebar: Alloy 2" Rise in black Stem: Height and angle adjustable alloy black Seatpost: Alloy suspension black Grips: Double density Ergonomic Saddle: Velo plush comfort Frame color: Champagne Sizes: 16""(easy step), 18"". Include size in comments