Which of the following is NOT a type of pedal retention device?

The correct answer is that flat pedals are not a type of pedal retention device. Pedal retention devices are designed to secure the cyclist's foot to the pedal, enhancing control, efficiency, and safety while riding.

PowerGrips, toe clips, and clipless pedals all achieve this goal through various mechanisms. PowerGrips feature straps that firmly hold the foot in place, toe clips encase the front of the shoe and may use straps for added security, and clipless pedals use a specialized mechanism that allows the shoe to clip into the pedal, providing a secure connection.

In contrast, flat pedals, which have a simple platform design, do not offer this retention function. They allow the rider to easily place their foot on the pedal without any restriction, enabling quick dismounts and adjustments. This makes flat pedals more accessible for beginners or casual riders, but it does not provide the same level of retention and control as the other types mentioned.