Different indoor speed with the same setup

Question

Hi, 
 I have adjusted my wheel size so it's roughly matching the speed from Zwift (I know it's based on cadence). Normally it's working really fine but sometimes it's dropping back to the old speed. Is it possible to see the issue with the exported training files? 
 First file 
 Second file 
 Thanks if anyone can help.

Luko79 · Accepted Answer

ok, both rides were controlled by Zwift? ( what control the Neo's resistance?) yeah, with small chainring (36T) front and middle rear (18) the speed is apprx 25km/h with 100rpm. How is the pairing in the Edge, i mean, i see that the Neo is paired as indoor trainer, do you sometimes control your Neo with Edge ? because my theory is sometimes the speed data is coming from the indoor trainer protocol (and i think in this case with the standard 2096mm) and sometimes as a Speed/Cad sensor (where you modify this value to 3500mm) i suggest to disable the Neo as indoor trainer in the Edge (if always a computer or tablet with Zwift control the Neo via BT or ANT+) and use only the "Neo spd/cad sensor ". and in this case you need to pair the Neo as power sensor to the Edge.

Different indoor speed with the same setup

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