21.   Ullrich labored mightily at the front of the pack chasing Pantani up the final ascent, setting a strong pace with Julich on his back wheel.

22.   Virenque finished second in the stage Monday with Ullrich plastered to his back wheel over the final climb and descent to finish third.

23.   Whenever I drive my grandfatherUs Farmall Cub, I have to step up on the thick rubber tread of the back wheel and pull myself into the driverUs seat.

24.   An unpleasant accident marred the finishing stages when Australian Scott Sunderland flew off his cycle after the TVM team car made contact with his back wheel.

25.   An American Eagle turboprop landed safely on its two back wheels after the front landing gear became stuck during flight.

26.   An unpleasant accident marred the finishing stages when Australian Scott Sunderland flew off his cycle after the TVM team car hit his back wheel.

27.   Ferrari said the crash occurred when Schumacher slammed the brakes after the back wheels lost traction.

28.   On a hot day, Ullrich was not wearing a helmet when he touched the back wheel of his teammate Udo Boelts and crashed hard.

29.   The back wheels touch down first, then the nose gear.

30.   A synchronous motor provides power to a planetary wheel mechanism and a rubber tube between the front and back wheels allows it to negotiate curves and bends.