Boy is this an exciting piece of equipment from SON Germany!

An outstanding, clever system that allows for a generator hub and no disconnecting of wires for wheel removal.  Perfect for the serious Brevet rider and very convenient for the world traveler.
A special set of dropouts act as the electrical connection for the wiring which is run inside the fork leg. I take it a step further and run the cable up the steerer tube to a custom topcap switch. With a wired taillight we can exit the bottom of the steerer or behind the stem depending on frame style.  Both solutions are very clean and unobtrusive.

NAHBS 650B Mixtie with SL FORK, SON SL Hub and custom Topcap Switch. Tailight is wired.

A better explanation from Peter White the US distributor, our source and a purveyor of many other nifty bicycle parts in his online catalog Peter White Cycles.

“The right side axle end isolates the surface that faces the dropout from the axle center. The axle itself carries the ground side of the electrical circuit. The dropout face on the right side of the hub carries the power side of the circuit. You can easily tell the difference between the right and left side by looking at the axle end cap. The right side cap is wider than the left side cap. The right side cap must only be inserted in the fork on the right side of the bike. With the disc version of the hub, the disc is always on the left so there’s never a chance of mounting the hub backwards. Also, the printing on the hub flange is only on the right side of the hub shell. In the dark, you can feel the printing on the right side of the hub, so you know which way to install your wheel.

At night without lights, if you mount the wheel backwards in the fork you get a short circuit and your lights will not work. Simply reverse the wheel and all is well, no harm done to either lights or hub. Even riding at high speed on long descents with the wheel backwards will cause no damage. There would only be increased drag due to shorting the output of the hub, but that drag would still be less than if you were using a sidewall dynamo.”
Peter White Cycles

SL Iglefork  $550

Made to order. 1 1/8″ only for switch.

Wiring packages:

SON SL Hub with SL fork wired: $TBD
SON SL Hub with SL fork wired for and with switch/topcap: $TBD
SON SL Hub with SL fork wired for and with switch/topcap, head and taillighting: $TBD