I was on Zwift for the first time tonight, whilst also running Wahoo app on my phone. I use the Wahoo speed/cadence sensor. Wahoo had me doing around 15mph, at the same time Zwift had me doing nearly 30mph! Then, Zwift lowered my speed on the ‘hills’.
I know in the Wahoo app, I set my wheel size to get an accurate speed. But, how does Zwift calculate the speed?!
Over my first 30 minute ride, Zwift had my average speed at 21.8mph, Wahoo app at 15.3mph.