The dynamo hub, Q’AUTO compatible CUES derailleur, and wireless Di2 shifter. In addition to urban bikes, Q’AUTO seems like it may be a good fit for long-distance gravel riders and bike touring.

Keep in mind, a dynamo hub goes for $75-$100 new, and between $100-$300 for a complete dynamo wheel. For those building their own wheel, tack on another few bucks for spokes and nipples.