Internal gear hub efficieny compared to single speed and derailleur

Andreas Oehler at Fahrradzukunft made some efficiency measurements of some well run in IGH’s (Rohloff Speedhub 14 ca 5,000km, Alfine 11 ca 3,000km), at their different gear ratios compared to single speed and derailleur gearing: http://fahrradzukunft.de/16/wirkungsgradmessungen-an-nabenschaltungen


thin lines are at 50W, thick lines at 200W. All measurements at 60 rpm crank speed.

In part 2 he measured and compared the Rohloff Speedhub 14, Alfine 11, Inter 8 and NuVinci N360: http://fahrradzukunft.de/17/wirkungsgradmessungen-an-nabenschaltungen-2


thin lines are at 50W, thick lines at 200W. All measurements at 60 rpm crank speed.

In part 3 he measured and compared the Pinion 1.18 to Rohloff Speedhub 14, Alfine 11, and Inter 8:  http://fahrradzukunft.de/20/wirkungsgradmessungen-an-nabenschaltungen-3


thin lines are at 50W, thick lines at 200W. All measurements at 60 rpm crank speed.

The Pinion showed higher efficiency losses at higher crank speeds:

Overall lesser efficiency at 50W is likely due to proportional higher losses from seals, chain tensioner, gears, ect (eg if you have overall gear train losses of 10W, you got proportional higher overall losses at 50W power input than at 200W power input)

The articles are in German, but Google Translate will make them readable in Englisch. Take some time to understand the grafic’s. They might look a bit confusing at first.

The graphics show, the Rohloff isn’t just the most expensive IGH with the highest gear count (exept the bottom bracket mounted Pinion 1.18), it got the smallest efficiency losses, regardless of power transmission, as well.

You might take these measurements with a grain of salt. Tester Andreas Oehler himself mentioned at the end of part 1 some potential measurement errors. Regardless, I find these comparisons highly interesting, even if the actual measurements aren’t 100% correct. Even if it where, his clean chain drive might have diffent losses than my dirty chain drive. In my view it is enough to see a more or less correct tendency in efficiency differences between the different drive train variants.

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One Response to Internal gear hub efficieny compared to single speed and derailleur

  1. Gabriel says:

    I think the single/fixie is the most effecient more than the other 2 types due to less components and lighter weight and direct power deliver , gear ratio here is most important topic when we talk about fixi/single. I use 48 18 and its more than wonderful

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