http://www.spacycles.co.uk/products.php?plid=m2b0s170p1771
only problem its 143 in euro the wife will kill me,
the one on the german site was only 99euro and a pretty good wheel.
ok looking now at the N30 how good or bad is this dynamo its a lot more in my price range but am im going to have to pedal like a lunitic to power up my lights and if at a later date will or can i fit a charger to it.
The first one, the N72 is a really good one with the better bearings, Ultegra level; all the later top Shimano dynamos are based on it. The thing is, I've never heard of anyone rebuilding a Shimano dynamo. The replacement parts are as much as a whole new one at the discounters, and after 40K or 50K, it is probably long since time to replace the rim anyway, so the wheel rebuild isn't an extra, it's a necessity.
The N30 is a cheaper commuter's dynamo. But I have it's equivalents, from back when it was all there was, and it's a pretty good dynamo. Think about it. A commuter by the nature of things needs a reliable dynamo for a good stiff, regular mileage. I don't see where you get this idea that you will have to pedal harder, or can't get as much charge from the N30, compared to the N72. The only difference is the replaceable bearings in the N72.
There's like a gazillion N30 in Dutch and German bikes, and by comparison only a few N72 and a minuscule number of SON. I bet you'll be able to get parts and whole replacements for the N30 long after the N72 is forgotten and the SON is a Chinese brand-mongering exercise.
The big difference isn't in engineering but in desire. All the pretend-engineers cream themselves over the better bearings. They'd do better to consider whether they will actually rebuild the N72, given the comparative price of a rebuild kit and a new dynamo, and the availability in the retail channel of the rebuild kit (somewhere between marginal and zilch -- guy at Petra Cycles, best source for Shimano hub dynamo and hub gear spares, offered to try to get me a rebuild kit but he sounded doubtful, and I told him not to bother, I'd rather store up his goodwill for something more important). They should also consider the cost of special tools required for the rebuild. Download the tech sheets from Shimano Europe to see which special tools are required.
Andre Jute