1. The problem statement, all variables and given/known data A bicycle has 30cm radius tires with gear and pedal dimensions as shown. IF the maximum vertical force that a 70kg rider can exert is equal to his/her body weight, what is the horizontal force that can be exerted on the ground by the rear tire? http://img48.imageshack.us/img48/8492/28mn1.png [Broken] 2. Relevant equations same as Spool question 3. The attempt at a solution well first I got 686 N [70x9.8] but I have no idea what point to use as the pivot.