Thread: How do you calculate %gradient of a hill?
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Old 08-18-11 | 09:58 PM
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LesterOfPuppets
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Originally Posted by Mr. Beanz
After? I figure mine before the ride so that I know what I'm dealing with. I don't use a Garmin so I use MapMyRidedotcom. I map the ride then press elevation, it will show the grades with %'s.
I've found mapmyride to be pretty inaccurate with grades. If you go too granular it over estimates grade and if you go too broad it underestimates them, IME.

For example, here's an instance of going too granular. A quarter mile chunk of road I ride all the time. MMR says it hits 20% up near the top. It gets nowhere near that.

http://www.mapmyride.com/routes/fullscreen/40664720/

On the other hand when I have this bit of road as part of a 12 mile ride it takes too big of a stretch of road for the average and the hill comes in under 2%.

Actual grade probably peaks out around 7%. Average for the quarter mile I'd guess around 5%.
Last edited by LesterOfPuppets; 08-18-11 at 10:45 PM.
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