Abstract: A bicycle suspension system includes a frame with a downtube and a seat tube, a bottom bracket, a rear wheel, a rear suspension, a rear shock absorber, and a linkage connecting the rear shock absorber and the rear suspension. The seat tube is disposed along a longitudinal axis, is configured to receive a seat post, and allows at least four inches of adjustability of a position of a seat saddle connected to the seat post. The bottom bracket is connected to the frame. The longitudinal axis of the seat tube intersects the downtube at a location spaced apart from the bottom bracket and is disposed at an angle between 50° and 75° degrees relative to horizontal. The rear suspension connects the rear wheel and the frame and controls movement of the rear wheel though a range of vertical travel of the rear wheel of at least four inches.