US Patent 7997389 Bicycle with front and rear disk brakes operable approximately simultaneously

A bicycle includes front and rear disk brake units. The rear disk brake unit includes a rear brake lever unit, a rear brake disk, a rear caliper device, and a rear brake oil tube interconnecting the rear brake lever unit and the rear caliper device and having a first inner diameter. The front disk brake unit includes a front brake lever unit, a front brake disk, a front caliper device, and a front brake oil tube interconnecting the front brake lever unit and the front caliper device and having a second inner diameter greater than the first inner diameter so as to allow for approximate simultaneous clamping of the front and rear caliper devices on the front and rear brake disks, respectively, when the front and rear brake lever units are operated simultaneously.