Commuter profile

[albafar]

I do a lot of commuting. Sometimes just in race gear - but sometimes also with a 10 ltr rucksack on my back which must influence CdA causing the reported power numbers to be too low. So I was thinking of creating a profile for that situation. Any ideas of what additional drag I should count in? My current roadbike CdA is set to 0,369 m2.

[Velocomp]

How fast do you ride on your commutes? Are there hills or is it flat?

Depending on your answers it may not be worth messing with the CdA value.

[albafar]

It is rather flat - no hills and you have to look close to identify just a small slope - 22 km each way. Average speed is in the area of 30 km/h +- 2 - sometimes it's rather windy. There are 49(!) traffic lights which is a great motivation for sprint intervals

[Velocomp]

I would not make the minor adjustment for your backpack. It won't change things enough for you to really notice, especially if you're doing sprints.

[albafar]

Thanks - I will then just leave it as it is.