Advantages: Impressive durability, adjustibility, reliable SPD mechanism Disadvantages: Mud clearing not as good as other brands
...Why would you want a pair?
Clip-in pedals originally developed for road bikes, have found their way onto cross country mountain bikes. A metal plate called a cleat is bolted to a specially adapted shoe. The cleat engages in a sprung loaded clip on the pedal, holding the foot in the most efficient position. You disengage the clip by rotating the shoe. They also enable you to pull on the up-stroke improving power, although the power benefits are relatively modest.
The major advantage of clip-in pedals is that it enables you to perfect a smooth circular pedal stroke. Next time you're out on a flat piece of road/track, drop a gear, unclip one side and try pedalling with one leg. If you're anything like me when I tried this you'll get an amusing jerky pogo like action. Perfecting a circular rather than up and down motion...
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