Diamondback Sizing Charts

Rider's Leg Length Must be Geater than the Bike's Stand-over Height
Adequate STAND-OVER CLEARANCE is the most important part of a proper bicycle fit. You want at least 1-inch of clearance between you and the top-tube as you stand flat-footed over the bike (without sitting on the seat). This means that the rider's leg length MUST BE GREATER than the stand-over height by at least one inch. In many cases the stand-over clearance will be more than one inch. For example, many aggressive mountain bike riders prefer to have 4-5 inches of stand-over clearance. This will mean that the bike may be slightly smaller (length and height-wise) than is normally recommended. However, for most riders, a stand-over clearance of 1-3 inches is ideal.