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Old 02-17-14, 08:52 PM   #1
mgb
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How steep, really?

I usually map my rides with ridewithgps or mapmyride, in order to get a good estimate of the grades. Now that iphones have level apps, I decided to check a few spots on my usual loop, driving the route and stopping to check the grade at the steeper points.

The steepest parts of the hills that ridewithgps says are 20 plus % are reading 8 to 10 degrees on the phone and that translates to 14 to 18 %. So it's steep, but not as steep as I thought!

Just thought I'd mention the discrepancy for anyone else using the programs.
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Old 02-17-14, 11:29 PM   #2
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What kind of road are you riding on that's 18%? That's incredibly steep... Heck, Lombard is "only" 27 % and you can see what they had to do to get cars to drive on it. 13% is about as steep as I've seen around me and that's enough to make me want to cry as it is. My driveway is about 18%. but it's only 50 feet long or so.
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Old 02-17-14, 11:36 PM   #3
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Come ride in my neighborhood. Grades in the 15-20% range are fairly frequent. The road I ride to and from the coast hits 21% in several spots...
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Old 02-17-14, 11:48 PM   #4
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The reason that Mapmyride, ridewithgps etc don't give accurate measurements is because they doesn't actually follow the contour of the road. If you are using a real inclinometer you'll get much more accurate results.
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Old 02-18-14, 11:52 AM   #5
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Hell. There are even hills in NJ that have 15%-20%+ ruling grades.
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Old 02-18-14, 05:48 PM   #6
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Quote:
Originally Posted by Homeyba View Post
The reason that Mapmyride, ridewithgps etc don't give accurate measurements is because they doesn't actually follow the contour of the road. If you are using a real inclinometer you'll get much more accurate results.
The last time I went to Google Earth, last week I discovered that it actually accounted for road contours cutting hillsides. This is a recent development. I suspect more accurate RWGPS, and MapMyRide elevation tracks may not be to far in the future..
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