I don't see how they can be used on an adult bike. They are made of very cheap plastic and very slippery. I attempted 20 miles on my gravel bike and thought I hurt myself. When you try to apply force to the pedals, your feet slide sideways, forward, or backward. I removed the pedals as soon as I got home and reinstalled the old pedals. Today I am ordering new pedals from another company which are more expensive but are said to be much better and safer.
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