Distance and Speed Measurement Error

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Darryl

• June 14, 2024 16:06

Hi, my first ride on my K3 produced a distance double the actual distance. The wheel calibration was set to automatic, and it looks like it was set for a 700x23 wheel, (I ride a 700x25 tire.) I wish my average speed were true (33mph) but it’s a pretty flat route. I connected to my Garmin GSC10 cadence and speed sensors. Anything adjustments I’m missing? I’m pretty shocked this reading is so off out of the box. Thanks.

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  Ali

  • June 19, 2024 17:37

  Hi Darryl, that is indeed an outlier in terms of our standards. If you are using the GSC-10 sensors, please make sure your setting related to the speed source is correctly set, and make sure there are no other speed sensors causing this issue. If you think all the settings are up to date, please share the serial number of your Karoo and FIT file of this ride with us by submitting a request here: https://support.hammerhead.io/hc/en-us/requests/new

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  Scott Dalessio

  • June 20, 2024 10:04
  • Edited

  I am having a similar problem with my new K3, though the variance isn't as significant. I'm using a Wahoo RPMSpeed Sensor. I thought it was just a quirk on a ride the other day, but yesterday and I did a route that I've done many times and the numbers were off, though mine seem to be a variance in the other direction (slower speed and shorter distance). Distance my Karoo recorded (~39 miles) was off by about 6% compared with both my Apple Watch and Specialized apps (both recorded ~43 miles).

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  Darryl

  • June 30, 2024 19:14

  Hi, to follow-up on the distance error described above, my K3 recorded accurate speed and distance using a Garmin Speed and Distance 2 hub sensor. I’m once again using the Garmin GSC-10 sensors and the speed and distance output is also accurate. Thanks to Hari at HH who spent a lot of time with me on this puzzle!

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