The bicycle smashed on the ground, but luckily did not hit anyone.

The four were charged on Monday with committing a rash act which endangered the safety of others.

They all pleaded guilty.

Community Court Judge Soh Tze Bian called for probation reports for three of the boys - Johannis Johari, 17, Lionel Koh Yao Sheng, 19, and Muhammad Juffri Jumat, 18. The trio, all first-time offenders, will be sentenced on April 30.

The fourth member of the group, Suriaamin Mohamed Jabal, 17, will be back in court on Tuesday.

For committing a rash act, they each face up to six months' jail or a $2,500 fine or both.