I think that's a really hard question because we're all riding in different places, on different bikes, at different ages, and so on and on.
I'd tend to think about how I feel, how my fitness feels, how my legs are, and how big my smile is.
For me, as a casual, casual rider, on not very hilly terrain, 15 mph feels really good mostly over a ride of that distance. I've certainly never maintained 20mph for very long on a flat.
My retired women's group rides about 14mph; I know women who ride with another group that just whizzes by us.
But if you want to race, you probably have to go a lot faster for a lot longer.



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