Is 13 miles in about 41 minutes good on a bike?

Well first get a bike computer and make sure you set it up correctly. That is about right, but I bet it's more like 50 minutes. Unless you live in a totally flat area. As a grown man I do 13 miles in about 45 minutes. That is with two big climbs, and on a multi-speed bike. That is about a 17mph average, which i doubt you do.

The only way to train is with a bike computer. They range from 20 bucks to hundreds of dollars.

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