Dirt Bike 4 is a wonderful skill game that you can play on www.games501.com for free. Your aim is to accomplish all the levels in the shortest time. The less time you spend, the more points you will get. Use up and down arrow keys to move forward and backward, left and right arrows to keep balance. But be careful, the journey is full of difficulty. One day, you may become a distinguished virtual bike rider like splendid Lance Armstrong. Good luck!
