Western Australia Police has shared one of the "interesting" images captured by its speed cameras showing a motorcyclist in shorts and a T-shirt coming off his bike.

"From time to time our speed cameras capture some interesting things," a police Facebook post read.

"Last Sunday, 20 March 2016, a speed camera on the Kwinana Freeway captured a motorcyclist sliding past at 112km/h — but unfortunately he wasn't on his wheels.

"He was also wearing shorts, a T-shirt and no gloves. Ouch!"

Police reminded riders to have a read of the safety gear guide.

"It could make the difference between a nasty tumble and injuries that prevent you from ever riding again."