We want to take a minute to talk about speed and distance calculations in the Sufferfest Training System. There are things that we can control and do at the moment, things that you can do to improve accuracy, and things we still are working on. We will break this down into three categories; virtual trainers, smart trainers, and power meter users.
The Sufferfest Training Centre will collect speed and distance data for all Virtual Watts users. We collect the data from your paired speed sensor and convert that into a distance measurement. The only thing a Virtual Watts user needs to check, is the wheel size in our settings menu. Make sure you wheel size selection matches what you are using on the trainer.
Double Check That Wheel Size Matches
Smart Trainer speed and distance gets a bit more complicated. The Sufferfest Training Centre takes the speed report directly from the Smart Trainer you are using. Most smart trainers report speed in one dimension. This means they don't calculate or apply any formula to compensate for gear selection. The speed and distance reported will rely directly on the gear you are using on your smart trainer.
-A user riding in the 39 x 27 gear ratio could have lower speed reports averaging anywhere from 11 to 13mph. This means a one hour workout would only report 11 to 13 miles.
-A user riding in the 53 x 11 gear ratio could have higher speed reports averaging anywhere from 30 to 40mph. This means a one hour workout could report up to 30 to 40 miles.
The other thing to consider is tire selection size. Almost all smart trainers will use the default wheel setting of "2096mm". Some smart Trainers like the Elite Trainers will need a specific wheel size for that trainer. Check out the article Connecting Elite Trainers.
There is only one power meter that can report power and speed at the same time, that is the PowerTap Hub power meter. All other power meter users will not get distance or speed reports until we integrate that capability. There is no way to connect a speed sensor and power meter at the same time. Sorry about that, we have it planned in the future.
Do you have questions about speed reporting or feel like your trainer is reporting the speed incorrectly? Please email firstname.lastname@example.org to discuss this issue further.