What is the Simulspeed formula?

[David George]

-What is the algorithm connecting the actual speed of my wheel with the speed in the video? For example I selected
a resistance level 3. I can try many combinations, but would be also nice to know the formula.

[David George]

We calculate power using the standard formula:-

power (watts) = bike + rider weight (kg) x 9.8 x elevation gain (meters) / time (seconds)

in other words: Power = Force / Time

Elevation gain comes from the profile data.

We then use the power curves for the home trainer to get a road speed figure (using simulspeed).

I'm not that will help you much.

If you have an idea of how much power you can output over a minute then set your resistance level to around that power at around 40 kp/h. The power curves for the supported trainers are in the manual. The ideal resistance level will depend on your bike's gearing. If you can't pedal fast enough to produce the required power than you can increase the resistance level. All that is assuming you are using simulspeed.

If you don't use simulspeed than it is a 1:1 mapping between trainer speed and road speed. So it is like you are always on a flat road.

[Ciro Semprebon]

I noticed for my roller that I need to wait around 10-15 minutes the fluid to warm up, until the
resistance becomes reasonable. Maybe is a problem of my 10 years old roller, but would be possible
to account for this? Also, I am not so sure that the power profile is really fitting. Would be possible
to give to the users the option to edit it by hand? (or give a mathematical function, or tune more parameters)?

[David George]

i. You can create your own resistance profiles. I will give some information on how to do this in the next manual release.

ii. it is not possible to take into account the warmup power. For all the training programmes we have we allow about 15 minutes warm-up. Good for the turbo, good for the legs.

iii. I think you said you have the Elite crono hydro mag. This isn't on the current list of supported trainers. This is a fluid/magnetic trainer and probably produces more power than the profile you are using for a given speed. This will be hard work.

We can add support for your trainer as a Service Pack, probably by next week.