The SON 29 S is a lower-profile hub with a new generator design tucked into an oversized disc-side hub flange, developed for the performance-oriented adventure market. On the bike, it almost disappears behind even a small disc brake rotor, giving you a more modern aesthetic.
The generator inside the SON 29 S dynamo hub may be narrow, but it is still designed to put out the same 6V/3W power as a regular dynamo. SON optimized the 29 S for power output at relatively low speeds, enabling high power output for lights & electronic devices while cycling.
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