bike dork disk

A bike dork disk is a small plastic or metal disc that is typically mounted behind the rear cassette on a bicycle. Its primary purpose is to prevent the chain from accidentally slipping off the smallest cog and getting caught between the spokes of the rear wheel.

The dork disk is often called a "dork" because some cyclists consider it to be an eyesore and a sign of a less experienced or less skilled rider. However, many bike mechanics and enthusiasts still recommend using a dork disk as a simple and effective way to prevent chain-related accidents.

It's important to note that a dork disk is not a substitute for proper bike maintenance and adjustment. Regularly cleaning and lubricating the drivetrain, checking chain wear, and properly adjusting the derailleur can all help prevent chain slippage and other mechanical issues.