Abstract: A Bicycle Rear Wheel Suspension Chassis for a Bicycle. Improved performance, low center of gravity, and ground clearance result from a Front Triangle Frame 1 with Steering Housing 25 and Crank Shaft Housing 20, a Link 2 with forward most end pivotally attached to Lower Pivot 22, a Swingarm Chassis 24 pivotally attached to rearward most end of said Link 2, and a rear wheel pivotally attached at Rear Axle Location 19 to said Swingarm Chassis 24. The Shock Absorber 7 attached to said Swingarm Chassis 24 provides means for suspension spring rate and damping for isolating a bicycle rider from trail impacts with the rear wheel. Performance and handling advantages result from a low center of gravity system, a Link 2 at the Lower Pivot 22 that provides better control by reacting to travel over trail objects, and a moving instant center that reacts optimally to impacts of varying magnitude and frequency.