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Hello

I get average of 185-190 km/h speed on my Garmin forrunner 645 watch and MyETrainning app on Android

Anything you might suggest?

Alin

In the Garmin, you have to set a circumference equal to the roller one.
So, you have to set a 94mm circumference (notice that not all Garmin Devices allow to insert a so low value)

Regards