Patent ID: 7934739

Claim:
A twenty-nine inch wheel bicycle frame, comprising: a substantially rigid front triangle; a substantially rigid rear triangle sized to accommodate a twenty-nine inch wheel; a top linkage pivotally connected to the front triangle at a top-front pivot point and pivotally connected to the rear triangle at a top-rear pivot point; and a bottom linkage pivotally connected to the front triangle at a bottom-front pivot point and pivotally connected to the rear triangle at a bottom-rear pivot point, an effective length of the bottom linkage being substantially equal to an effective length of the top linkage; wherein the top-front, top-rear, bottom-front, and bottom-rear pivot points are positioned such that: chain tension urges the top linkage and the bottom linkage to pivot in opposite directions; bumps urge the top linkage and the bottom linkage to pivot in a same direction; and the top and bottom linkage cooperate to direct a rear dropout in an arc characterized by chain growth throughout approximately a first 25% of suspension compression and characterized by an absence of chain growth throughout approximately a last 75% of suspension compression.