Carl Watts wrote: ↑January 15th, 2020, 3:41 am

By the way its not a good idea to compare 100W on a bike to 100W on the Erg, the two do not equate to the same distance.

Although it is a bit off-topic, I like to add a more general remark about the comparison of power on a bike and power on a row-ergometer.

The C2 pace-to-power calculator uses the formula watts = 2.80/pace³. Pace is the inverse of linear speed v [m/sec], so watts = 2.80 x v³ .

The power for riding a bicycle on a flat road is composed of two components, rolling resistance and air resistance. Rolling resistance power is proportional to the linear speed v. The air resistance power, in the absence of wind or drafting, is proportional to v³. For linear speeds above 12 km/h the air resistance dominates.

Hence for realistic speeds the rower-erg and an outdoor bicycle have nearly the same relation between power and speed. A bike-erg use the same turbine flywheel as the row-erg and will behave similarly.

The linear speed of a real road bike on pavement, and presumably of a bike-erg, is about double the speed of a row-erg.

For the following comparison I used the power-to-speed graphs from

https://tunedintocycling.com/2014/06/28 ... esistance/
200W input : v-row = 15 km/h ; v-bike = 33 km/h

100W input : v-row = 12 km/h ; v-bike = 25 km/h

60W input : v-row = 10 km/h ; v-bike = 21 km/h

Again the conclusion is that the two are very well comparable. For the same power and time, the distance on a road bike will be roughly twice that on a row ergometer.