The Forge Sawback 5xx hard-tail mountain bike offers brand name components and is awesome on dirt trails and single tracks. Shimano Deore drivetrain and shifters with a Truvativ ISOflow crankset, RockShox Dart 1, dual AVID BB-5 mechanical disc brakes and a lightweight aluminum double-butted frame that provides superb stability, control, power and responsiveness. Sawback 5xx uses well-recognized WTB products such as WTB SpeedDisc XC Rims, a Pure V Sport saddle and grips. Note: Frame size is determined by measuring the distance from the center of the bottom bracket (bolt that locks in the crank) to the top of the seat tube. Stand-over height is determined by measuring the distance from the ground to the top tube. A bike that you ride only on paved surfaces and never take off road should give you a minimum stand-over height clearance of 2". A bike that you ride on unpaved surfaces should give you a minimum of 3" of stand-over height clearance and a bike that you ride off road should give you a minimum of 4" of stand-over height clearance.