Difference speed

Speed ​​difference
I have a problem with speed

The Zwift says I’m going at a speed and it never matches the garmin

Zwift says: 14km ​​/ h 70cad 160 HR
Garmin says 30km / h 70cad 160 HR

never sync the correct speed

I have Garmin Ant + speed & cadence all in 1
The Zwift is installed on the computer but the same happens if I use it on the cell phone

Somebody help me?

Hi @Roberto_Yau

Welcome to the Zwift Forum

Zwift takes the wheel speed broadcast by your speed sensor and the power curve of the trainer you select on the Pairing Screen and converts that to virtual watts. With those watts, the weight entered, height entered, in-game bike used, in-game drafting (Tri and TT bikes get no drafting boost), in-game wheel set, in-game road surface, and in-game virtual elevation changes your in-game speed is determined.

@Paul_Allen should Really need to make this a sticky:

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Thanks Gerrie

That means there will always be a possible difference.

ok makes sense, thanks for the clarification

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