Not in the hub, bad for unsprung mass. In the bottom bracket like this https://pinion.eu/en/ https://pinion.eu/en/ But has some tradeoffs that mean it isn't q

Not in the hub, bad for unsprung mass. In the bottom bracket like this https://pinion.eu/en/ https://pinion.eu/en/ But has some tradeoffs that mean it isn't quite there yet.