Join Date: Jan 2007
Location: Cheyenne, WY
Bikes: 1975 Peugeot UO8 (many, many upgrades ;-)
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I used a Sanyo bottom bracket generator for years, starting in the late 70's. At the time it was IMHO the best generator out there--other bottle generators were total junk. The drag is minimal, and after trying a gazillion pre-halogen light bulbs to find a good one, pretty bright. The light shown in the picture *looks* like a B&M, but it could be a knockoff.
The biggest problem you'll have with it is in the rain or snow. When the face of the tire is wet, the roller simply slides and your lights go out when you need them the most--the dark and rainy night. And water pouring down the rear fender makes sure it gets wet! Sometimes mud gets caked on the roller, too, making it bounce out of the "on the tire mode", but once you get the hang of working the engage lever it's a snap to put it back in place. I would once in a great while lose connection to ground and the light wouldn't work, but I solved that by running two wires and grounding the lights back to the generator mount itself.
Because the face of the roller has to be darned close to the face of the tire--like 1/4"--any time you have to remove the rear wheel you have to move the generator out of the way. That wouldn't be so bad now that I run Schwalbe Marathon Pluses, but I was still using the BB generator in the month I had 9 flats in 2 weeks and that makes fixing a flat an even bigger PITA.
You'll want to wrap some handlebar tape around the chainstays where it mounts to keep the generator from slipping sideways and you've got to crank the mount down pretty tight even with the tape.
I switched to the Shimano dynohub and an IQ Fly/DT Toplight led a year ago and I won't look back--and I have *no problem* looking forward :-)