Some tandem riders arrange their cranks so that they are 90° out of phase to produce what is called the "4 banger arrangement". In practice, OOP setups range from a mere two-tooth phase difference between cranks to a full 90° phase difference. Generally, OOP provides the greatest benefits to the tandem team that has disparate leg-strength.[citation needed] When the tandem is pedalled IP it is possible, and often happens, that the stronger rider literally drops the pedals out from beneath the feet of the weaker rider and cause the latter to be unable to contribute meaningfully.