I bought these spikes for my new Peloton bike. I have used SPD spikes before and they are different from these. At first I was annoyed that they slide back and forth, I thought something was wrong with the spikes. I watched a few videos and got some information about these boots. These boots are called "floating," meaning they specifically slide from side to side to reduce stress on the knees. Nothing wrong with them like other reviews have said, it's just that they have a different construction and feel than SPD spikes. They are comparable to a Peloton bike.
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