Dimensions: 68L x 25W x 40H in.. 21-speed bike for men or women. Red lightweight aluminum frame. Shimano derailleur for fast gear changes. Flat handlebars. Plastic pedals with steel cages. Aluminum levers for alloy caliper brakes. Designed for the serious rider, this GMC Denali Road Bike - Red - Small features a lightweight, red aluminum frame that's easy to place on your car's bike rack. This road bike boasts 21 speeds with flat handlebars, plastic pedals with steel cages, and aluminum brake levers for the alloy caliper brakes. The Shimano derailleur allows for fast gear changes, while the Shimano Revo shifters let you to switch gears without taking your hands off the handlebars.