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indoor trainer speed is not realistic when contected to my edge 1040, it is to high. Is there a way to fix this and get a more accurate speed

PieroVdp
over 2 years ago

When I am riding my indoor trainer, connected to my Edge 1040, te speed is at least 25 to 30% to high. Is there a way or setting i have to change.  Calibration was done. Hope someone can help me with this issue.

Thx in advance.

  • 0 over 2 years ago

    Go to the Sensor page on your 1040, and set the wheelsize from the trainer sensor details (your trainer is a sensor)

  • 0 over 2 years ago

    Trainer speed is calculated by counting wheel revs (cassette revs on direct drive trainers) and multiplying it by a  tire circumference, with the assumption that the speed sensor/trainer reports each rev (one "tick" per rev).  Input the actual tire circumference for wheel-on trainers, or the tire circumference of your usual tire for direct drive trainers. Some trainers report fractional revs (I forget which) so the input tire circumference needs to be multiplied by that fraction.  e.g. the trainer reports 1/4 revs (4 ticks per rev). Tire circumference is 200cm. Set tire circumference to 200 x 1/4 = 50cm. 

    It's good to remember that your accurate actual speed and distance is zero. Trainer speed and distance are just made up for the rider's amusement and only roughly approximate what you might achieve if actually riding. What is relevant on a trainer is effort and time. Any workouts and their results are quantified by power, durations, HR, and cadence, and having nothing to do with speed or distance.

  • +1 over 2 years ago in reply to looigi

    Thank you very much for you answer.  I have a Tacx neo 2t.  My Tire curcumference is 2015mm.  But i suppose i need to put in my cassette rev into the 1040?  How do i know what is the cassette rev of the cassette mounted on my tacx.  I am sorry for the maybe stupid questions, but it is all new to me.  When i run my tacx connected to the desktop app then speed and distance are more accurate and realistic.  I have only the problem when the tacx is connected to my edge 1040.  But since i am not able to import my trainingpeaks workouts in the tacx desktop app, and i can import them into my edge 1040, i am forced to use me edge 1040 on my tacx indoor trainer. I know that speed and distance on a indoor trainer are referential, but as you mentioned, it is nice to know, or to have an idea about the speed and distance you are travelling, pure amusement, but nice to know.  Thank you if you could help me further.