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I have a Rider 50 that does not give an accurate total altitude climbed when compared to a Garmin or Polar which are almost identical. It always shows between 50% and80% more than the other two depending on the distance cycled - usually between 40 & 100Km.

I also find the slope very inacurate, one minute showing 22deg descent and the next 13deg incline when I am on a level road. It seems to be worse on bumpy roads. The Garmin does not function like this.