Originally Posted by
zacster
I have the Shimano 3N72 laced up to a 26" Mavic XM317 rim, on my old Trek 7000 mtb. It works great as a dynamo, but I'd say that it is a little heavy and I wouldn't put it on a road bike. You really can't feel it when the light is on vs. off, but I'd bet I'd feel a lighter non-dynamo wheel.
There are a few versions of the Shimano, and then there is also Shutter Precision, Sanyo, Schmidt and a few others. Shutter Precision is pretty light compared to my Shimano, and I almost went with that one instead and would try that if I ever needed another.
Just curious, since you have it on a Trek 7000, have you tried it off-road? Although my primary interest in dynamo hubs is for commuting, the idea of having a dynamo hub for mtb night rides is kind of interesting. I expect rpm's off-road would be too inconsistent for lighting but I have no experience with dynamo hubs myself.