Introducing Virtual Speed And Virtual Distance
We have implemented a new formula for speed and distance in The Sufferfest Training Center App. All activities shared with other services and the tcx file you get when you share to email after Oct 15, 2018, use this formula to fill in speed and distance data. We are calling this formula Virtual Speed.
What Are Virtual Speed And Virtual Distance?
We have created a formula that uses some simple physics equations to calculate speed from your power data. We use this virtual speed to calculate the distance for your ride.
How Does The Formula Work?
We are starting with a simple model that calculates instantaneous speed from power. It uses your weight (from the settings page in The Sufferfest App) and these as defaults:
Bike Weight: 9kg
Rolling Resistance: 0.005
Head Wind: 0 kph
Temperature: 0 C
Elevation: 0 Meters
Position: hands on the hoods
How Does This Affect Me?
- If you have a power meter that doesn’t report speed, this means that your rides will now show as having speed and distance in other apps.
- If you have a power meter, smart trainer, or Virtual Watts trainer, the speed and distance reported in the .fit file to other apps will now use virtual speed.
- Note: This means that you may see a difference in the speed and distance data from what your device reports. The Sufferfest doesn’t show virtual speed yet, so the speed shown on your activity in the Passport section of our app will not match what you see on the services.
What About Workouts Done Before October 15th, 2018?
This change affects all workouts shared after October 15th, 2018, regardless of when they were done. We don’t have a way to update activities already shared to other services. If you really like having virtual speed and distance, you could go back in your passport and either email the activities to yourself and manually upload them to other services or delete them from the other services or share them from The Sufferfest app if they haven’t already been shared. There are checks on our servers that won’t allow duplicates to be shared to other services so if you’ve already shared the activity to that service, you’ll need to manually upload the tcx file.
Why Did You Change How Speed And Distance Were Being Calculated?
We are adding this virtual formula in an effort to create more consistent speed and distance data no matter what equipment you are using. Some users (with power meters) have never been able to show speed or distance when using The Sufferfest App. Other users with smart trainers end up with some pretty crazy speed numbers. It is difficult to go in and address each of these specific situations so instead, we have found a way to level things out a bit. As we gather more data we will continue to improve the way that this formula works.