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Tacx Neo 2T, zwift versus edge 1030

TomBranders

Zwift-data: 60,09 km and 6,06 km = 66,15km (2 rides)

Edge-data: 53,52km (didn't stop at the first ride)

Difference: 12,63km

Powerdifference: 0

Cadence difference: 0

Where does the difference in distance comes from?

  • 0

    Zwift calculates speed and distance from power, not (fly) wheel speed. Zwift knows about height, weight, gradient, draft, drag, surface type and computes speed accordingly. The Edge has no idea about the Zwift environment and the speeds in that simulated world. It gets its distance and speed data from the speed of the (fly) wheel, not the power you're producing. 

    If you consider erg workouts the gap can grow even wider. If you participate in group workouts then your speed/distance is pretty much nonsense, or pot luck at best. For this reason I do not participate in group workouts. Also, your Trainer Difficulty setting will further vary the difference in speed/distance between Zwift and the Edge. 

    There is nothing wrong with having the difference and you can't fix it. Don't worry about it. 

  • 0 in reply to eezytiger

    Another example to illustrate the futility of trying to match the two sets of values....

    Suppose in Zwift you choose to "ride with" someone who is just about to descend from the top of Alpe Du Zwift. You join them, already moving and don't pedal at all. You can cover the 12km descent without recording a single km on the trainer and still score 12km in Zwift. Or you can pedal a bit, or a lot in whatever gear takes your fancy and spin the flywheel at any speed you care to. The distance and speed from the trainer will be meaningless on one hand, but on the other hand a much more accurate reflection of your effort. 

    Of course, if you first crawled your way up the mountain then you've earned that freewheeling descent so things might balance out better, but what if you quit at the top and didn't collect your free km on the way back down?

    You just can't make the numbers match other than by fluke. The Zwift numbers are "real" for the simulated world. The trainer numbers could be just about anything. 

  • 0 in reply to eezytiger

    Final thought - until the next one - When you warm up in the start pen for a ride or race in Zwift the clock doesn't start ticking (and distance accumulating) until the countdown timer reaches zero. Meanwhile you are on your trainer spinning that wheel and adding km/miles that Zwift does not give you credit for.

    There are just so many reasons why the numbers are unlikely to match. Why should they?

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