Inside a Brose Drive S

Rob Rides EMTB

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Mikerb

E*POWAH Elite World Champion
May 16, 2019
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Weymouth
What you can see is the use of a planetary gearset with helical teeth....a design that deliver speed reduction on the carrier and is both high torque and quiet. The carrier is connected to the output shaft which is in turn connected to the crankshaft via a toothed belt. Unfortunately about the only things you can see in terms of detail on the crankshaft is the cadence sensor ring (looks like a bracelet) and a bearing. It does not give any clues about the freehub type but my guess is that it is a pall mechanism as it seems completely encased and a meshed gear would need to be steel and need an oil bath. A pretty expensive and concise piece of engineering.
 

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