Originally Posted by
pasopia
Which shimano dynamo is that though, it doesn't say? I suspect it is the cheaper, less efficient one, due to the price. I would love to be wrong though.
Your not wrong. The more you spend the less drag when the lights are off. Shimano
dynamo hubs exhibit much less drag when lights are on than tire driven types and are not subject to slippage. If you do a a lot of night time riding they are worth the slight drag when disengaged. If your not going to be using it for more than a couple of hours at night they just do not make economic since in both cost and drag when off. I use a hub dynamo on my road bike when doing rides of 4 hours or more in the dark but for daylight rides it gets removed and my non-dynamo wheel and tire goes on. When you do spend lots of hours riding at night drag with lights off is a non issue because you'll be running with lights on most all the time anyway.