Pinch flat (snakebite puncture)

A pinch flat occurs on tube-type tyres when a sharp edge, rock or square-edged bump compresses the tyre so far that the inner tube is pinched against the rim. The result is typically two parallel slits, which is why it is also called a snakebite.

Low tyre pressure is the main cause, which is why pinch flats are common in enduro and trail riding where pressures are reduced for grip. Thin or old tubes make it worse.

Prevention options are heavy-duty tubes, correct pressures for the terrain, rim locks fitted properly, or replacing the tube with a mousse or a tubeless insert system. Carry tyre levers, a spare tube or patches and a pump on long rides.