I can't tell you what works best but I can assure you that tires like the Maxxis Hookworm with a wrap around tread are far from ideal. I had to machine a wheel of vulcanized rubber and adhere it to the metal contact wheel on the bottle generator. It's larger diameter dealt with the tread much better and also reduced the tire diameter/generator ratio to reduce the drag a little and keep the voltage of the generator down to acceptable levels when running 406s at speed. I run DIY LED head/tail lights so I also had to include an ICVR (up to 35v in, 5v out), just in case, to keep my LEDs from burning out. Keep in mind that bottle generators are normally intended for use on larger wheels.