Originally Posted by randomgear

I don't recommend sidewall dynamos, I used a B&M one for about a year and it would always slip in the rain and snow and if knocked out of adjustment would wear out it's rubber roller in about a minute. They also seemed to generate considerable resistance when on, even with an LED light.
These days with budget dyno hub wheels going for less than $100, I just don't see any benefit in a sidewall dynamo. Even running two LED headlights and a tail light off my Shimano dynohub wheel, I really don't feel any added resistance. Not much more expensive than a sidewall and maybe less if you have to add mounting accessories to your bike to make the sidewall dynamo work.