Paceline Basics – A “paceline” is the basic formation used to cut through the wind so that you can rest when riding in a group. Try to remain about ten inches behind your ride partner’s rear wheel. This takes practice, but is well worth the effort to learn because of the energy savings offered. Relax and watch your friend’s shoulders rather than his rear wheel. Be sure to talk so that he knows you’re back there. He should point out or tell you about road hazard coming up, too. Be careful not to let your front wheel come up and overlap your partner’s rear wheel because if he has to swerve, he’ll knock your wheel and you’ll crash.

detangler –

Also called a "rotor," this is a component found on the front end of many BMX bikes and some freestyle mountain bikes that prevents the rear brake cable from tangling so that you can do easy bar spins and tailwhips (spinning the bars or bike 360 degrees). It splits the brake cable into two segments, which are joined at a rotor installed above, or attached to, the bike’s head tube. As the bars rotate, the top segment spins while the bottom stays stationary and full braking power is available at every point of the rotation.