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Old 12-17-11, 04:44 PM   #1
philski
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Difference between Shimano dh-3d30 and dh-3n72 dynohubs?

Does anyone know the difference between Shimano dh-3d30 and dh-3n72 dynohubs? Google was not very useful.

I presume the DH-3D30 was an earlier generation model and I believe the DH-3N72 is comparable to Ultegra. Is there a difference in drag/power output?

Thanks,

philip
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Old 12-17-11, 04:50 PM   #2
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For starters, the 3D30 is a six-bolt disc model, whereas the 3N72 isn't disc-capable. Because the 3N72 doesn't need to make room for a disc rotor, it would make a symmetrical wheel, requiring only one spoke length and being a bit stronger (although hopefully that's an academic point).

For Ultegra-level quality, the 3N80 is the one to look at. Alloy axle, 0.4 pounds lighter (!), no disc mount.

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Old 12-17-11, 11:24 PM   #3
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Originally Posted by mechBgon View Post
For starters, the 3D30 is a six-bolt disc model, whereas the 3N72 isn't disc-capable. Because the 3N72 doesn't need to make room for a disc rotor, it would make a symmetrical wheel, requiring only one spoke length and being a bit stronger (although hopefully that's an academic point).

For Ultegra-level quality, the 3N80 is the one to look at. Alloy axle, 0.4 pounds lighter (!), no disc mount.


The 3N80 is the newer version of the 3n72. Only real difference is the lightening cuts on the LH side and the resulting lighter weight. Mechanical are Identical and the 72 can be found for a few dollars less.
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Old 12-17-11, 11:43 PM   #4
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The 3N80 is the newer version of the 3n72. Only real difference is the lightening cuts on the LH side and the resulting lighter weight. Mechanical are Identical and the 72 can be found for a few dollars less.
I don't think it's the newer version, more like the next model up, since they've coexisted in Shimano's lineup for a while now. The aluminum axle is another reason for the large weight difference. I wouldn't nitpick small differences in weight on dynohubs, but 190 grams is probably the weight of most dyno headlight/taillight combos, so I got a 3N80 instead of another Alfine/3N7x when the time came.

(...anyone wanna buy an Alfine dyno wheel?)

Last edited by mechBgon; 12-17-11 at 11:56 PM.
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Old 12-17-11, 11:47 PM   #5
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I have a cheap Shimano dynohub on my commuter that I think may be the one you want to know about. It's a lot tougher to turn by hand, still don't notice it on the bike.

I have both a 3n71 and 3n80, they really are very similar
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Old 12-20-11, 09:08 PM   #6
gracehowler
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Peter White Cycles website has good info on these dynohubs. http://www.peterwhitecycles.com/Shimano3N70.asp
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