Patent ID: 6877591

Claim:
A crank of a shock absorber for a bicycle, said crank having a front end pivotally connected with a bicycle frame and a rear end pivotally connected with a rear fork, a rear bearing hole formed in the rear end portion, a round hole formed in an intermediate portion, a narrow groove formed between said round hole and said rear bearing hole, a nut positioned at an upper side of said groove, a bolt positioned at a lower side of said groove to screw with said nut from outside, a disc fitted in said round hole and provided with an eccentric hole, said disc possible to be rotated microscopically; a rear shock absorber having a rear end formed with a pivotal base with a center hole facing said eccentric hole of said disc, a micro-adjusting rod extending through said eccentric holes of two said discs and through said pivotal base firmly, said rear shock absorber having its front end pivotally connected with said bicycle frame; said micro-adjusting rod being rotated to alter synchronously the angle of said rear shock absorber relative to said bicycle frame.