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Agreed. It’s marginal, but it’s fact.
2.5 minutes over 100km, does that think about the different on the rear hub from a low end to high end? (Could that be closer to 5 minutes?)
sbbohr-
I dunno, RTFA :)
All I know is that if those maths are correct people are overpaying for their dynamos.
"Given the leverage of a wheel and the flywheel effect of the rotating mass, dynamo hub drag only has a small effect on your speed. The result for most people is likely to be an extra three to six minutes riding time over 100km, all while getting a good charge to your electronics (or while running lights)."
youramericanlover
Your marketing stand shows the more expensive models as being faster? ;)
60kg rider / 30kg bike and gear / 100 watts. Non-Dynamo Hub = 23.83km/h.
Most efficient hub: on – 23.29km/h (5.25w extra drag) +2.3%
Least efficient hub: on – 23.19km/h (6.25w extra drag) +2.7%
"The most efficient dynamo hubs when switched ON add between 3min 24sec and 5min 47sec to a flat ride over 100km when compared to a regular hub."
https://www.cyclingabout.com/dynamo-hub-drag-lab-testing/
So even if you double the least efficient dynamo your adding only a few extra minutes over every 100km. That's beyond negligable for commuting and only slightly affecting times at a 200km audax - which I'm sure could be gained back elsewhere in bike position or tyre tread.
Round of applause for the ultra endurance cyclists who need to maintain the minutes over slow cycling for weeks on end against the clock. The 99% of other cyclists will never need or nor notice any demonstrable difference.