The Perimeter features high quality SRAM shifters and is a 24 speed bike which provides a great variety of gears and speeds for going up and down hills as well as for flat terrain. The RST Suspension fork is a high quality fork and will soften any bumps you may hit, diminishing their impact on your arms and upper body. The rims are double wall alloy which are light and strong, and the frame is also aluminum. Added bonuses with the S&W Perimeter include water bottles/cages and a rear rack, which is perfect for taking things on the go with you. This bike is available in several frame sizes - Choose from 18" 20" and 22".