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Re:I Learned to Cycle Like a Dutchman by Someone on Monday September 16, 2019 @12:47PM (#20985952)
Hills are fairly rare in the Netherlands, certainly in cities, where of the day-to-day cycling takes place. In cities, cyclists typically also use their brakes more when going downhill than in the countryside because there’s more traffic and the traffic coming out of side ways can be harder to spot. So, I don’t think it makes much of a difference.

Also, 20 mph downhill and 5 mph uphill gives an average speed of 8 mph, a bit lower than your claimed speed. I think that’s the generic pattern for hills: you lose more on the ascent than you gain on the descent because you spend more time on the ascent than on the descent.

Re:I Learned to Cycle Like a Dutchman by u801e on Tuesday September 17, 2019 @12:23AM (#20991524)
I'm basing my figures for max, min and average speeds as displayed by my bicycle computer. I also mentioned a loaded trailer to demonstrate that I'm actually slower than the majority of cyclists here because they're not towing around extra weight like I am (meaning their average speeds are higher than mine and they can maintain higher speeds when going up hill compared to me).

Also if I were to maintain an average speed of 8 mph, then my commute where I pick up my kids in different locations would take me nearly 2 hours as opposed to about 1 hour and 15 minutes. So speed matters if you want to complete the ride in a reasonable period of time.