movement speeds

, "21 mph" likely refers to specific or lineup timings .

To help you find the right document, could you clarify if you are looking for one of the following:

21 mph

But ? That is the sweet spot. It feels fast enough to be thrilling ("keju" in a fun way), but it often requires less effort than you’d expect, especially if you are drafting or riding a sleek road bike. It’s the speed where you feel like a pro without having to suffer like one. It’s the "cheat code" of cycling.

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