Originally Posted by
adamtki
Thanks for the info. The light I need would have to be bright enough to light up a completely dark path for me to go 20+ mph.
People have different perception about drag. Drag is a big deal to me, so I'd have to test it out myself to see.
Since I'd have to replace my beloved front disk brake wheel, I probably wouldn't go this route in the end.
Many people feel that the Cyo lights up the path for 20+ mph biking. I'm not sure, it's probably enough (the last bike I had it on was more like a 16mph bike). However, it doesn't matter for me - I also don't feel comfortable going that fast without a light on my helmet, no matter what lights I have on my handlebars. Obviously a helmet light couldn't run off a dynamo anyways, and with both I feel comfortable going 20+ miles hour.
fyi, the default for generator hubs is to come with a disc mount (on the super lightweight ones don't, like the Shimano 3N80). Mine that has a 3N72 on it came with a disc mount, even though I don't actually use it. So I guess I'm saying that replacing your front disc wheel likely wouldn't be a big deal (you could probably just move the disc and not have to buy a new one) - you certainly wouldn't have to replace your disc brakes.
What lights do you run now?