Patent ID: 7997389

Claim:
A bicycle comprising: a frame; a handle disposed on said frame; a front wheel unit disposed rotatably on said frame; a rear wheel unit disposed rotatably on said frame and behind said front wheel unit; a rear disk brake unit including a rear brake lever unit disposed on said handle, a rear brake disk disposed on said rear wheel unit, a rear caliper device disposed on said frame, and a rear brake oil tube having two ends connected respectively and directly to said rear brake lever unit and said rear caliper device, and a first inner diameter; and a front disk brake unit including a front brake lever unit disposed on said handle, a front brake disk disposed on said front wheel unit, a front caliper device disposed on said frame, and a front brake oil tube having two ends connected respectively and directly to said front brake lever unit and said front caliper device, and a second inner diameter greater than said first inner diameter; wherein said rear brake oil tube is made of a material having a first expansion efficiency, and said front brake oil tube is made of a material having a second expansion efficiency greater than said first expansion efficiency.