.. Teach those biker guys a lesson

If you now ring the bell they will start the "race".

The shape of their wheels isn't really optimized for racing.

If you would find a device that you can use to shape rock. That would be cool.

Did you open the hatch with the big rock, already?

There's the emergency phaser. You just need to calibrate it, first.

Use the phaser to make the race work.

Use the phaser on the wheels to make them round.

Give it a push. You get a special twig as a trophy.