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Dynohubs and disk brakes...

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Dynohubs and disk brakes...

Old 04-02-09, 10:41 AM
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Unknown Cyclist
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Dynohubs and disk brakes...

Hi,

I've gradually been fitting dynohubs to my cycles.

Yesterday I bought a front 26" wheel with a dynohub in it to fit to my tandem.

I've just realised I can't fit it because of the disk brake - the tandem is the only bike I've got with a disk and I keep forgetting

Are there any dynohubs that accept a disk ?

TIA.
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Old 04-02-09, 11:24 AM
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Allen
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Shimano's dynos are disk capable.
SON as well.
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Old 04-02-09, 11:25 AM
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SON dynohubs are available with disc mounting also.
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Old 04-02-09, 11:49 AM
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Originally Posted by John Lesar View Post
SON dynohubs are available with disc mounting also.
+1 the Schmidt Dynohubs (available from Peter White and other sources) are a damn fine hub. I've got one on my recumbent. Models: SON28S or SON20S.
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Old 04-02-09, 01:02 PM
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I have the Shimano disc brake dynohub on my Civia Hyland. No complaints so far. Per the tech manual SRAM also has disc brake dynohubs available.
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Last edited by tatfiend; 04-02-09 at 01:06 PM. Reason: expand
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Old 04-02-09, 05:37 PM
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I just started using my Alfine disc dynohub. I can't imagine anything better. Maybe one day I'll spoil myself with one of those SON hubs.
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Old 04-03-09, 10:13 AM
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Does anyone know how to remove part #6 from the hub ?

Hub assembly

TIA.
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Old 04-03-09, 02:40 PM
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That is the Stator and if removed and replaced on many hubs the hub will not operate correctly after it is reassembled. Certainly true of the old Sturmey Archer Dynamo hubs. When the rotor and stator are separated, w/o using a "keeper" correctly, the magnetism of the permanent magnets used in the hub is reduced. Definitely true of older design dynamo hubs with older technology magnets but I am not sure of current production units. As I recall SRAM indicates that their dynohubs are not user serviceable.

Hope someone with more knowledge of current Shimano dynamo hubs answers too.
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Old 04-04-09, 04:38 PM
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Originally Posted by tatfiend View Post
That is the Stator and if removed and replaced on many hubs the hub will not operate correctly after it is reassembled.
I think part #6 must be screwed into the hub, it definitely spins with the hub, wouldn't that make it the rotor and the fixed coil part that doesn't move would be the stator ??
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Old 04-04-09, 11:45 PM
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Originally Posted by Unknown Cyclist View Post
I think part #6 must be screwed into the hub, it definitely spins with the hub, wouldn't that make it the rotor and the fixed coil part that doesn't move would be the stator ??
Based on looking at my Alfine hub I would say part of 6 rotates with the hub. The axle and the electrical connector that item 2 in your posted diagram on the other thread attaches to definitely do not rotate. It could well be that item 6 is a combined rotor and stator.

Looking at the exploded diagram it appears to me that items 7 and everything to the right should be removed from the axle. Then it appears like item 6 should unscrew from the hub shell, I would think via the large innermost hex nut shown in the drawing, the one furthest inboard. The close together circumferential lines inside the hub shell and on item 6 appear to represent threads so the two items apparently screw together. No idea whether right or left hand threads though.

BTW what is your problem? Unless you can obtain replacement parts from Shimano I see no reason for complete disassembly. Many Shimano items are not designed for disassembly and no parts are available per my understanding, at least in the USA, no matter what exploded diagrams indicate.
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Old 04-05-09, 06:19 AM
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Originally Posted by tatfiend View Post
BTW what is your problem? Unless you can obtain replacement parts from Shimano I see no reason for complete disassembly. Many Shimano items are not designed for disassembly and no parts are available per my understanding, at least in the USA, no matter what exploded diagrams indicate.
No output and the axle doesn't turn unless you put a spanner on it.
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Old 04-05-09, 04:42 PM
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Originally Posted by Unknown Cyclist View Post
No output and the axle doesn't turn unless you put a spanner on it.
Ouch!

Have a competent dealer check with Shimano as to the availability of item 6. Otherwise it sounds like a whole new hub may be required. No output at all usually means a broken wire internally with most dynamo hubs.
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Old 04-05-09, 04:53 PM
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Originally Posted by tatfiend View Post
Have a competent dealer check with Shimano as to the availability of item 6. Otherwise it sounds like a whole new hub may be required. No output at all usually means a broken wire internally with most dynamo hubs.
I'm fairly sure #6 screws in (not sure if it's l/h or r/h thread) and is just a casing with a load of magnets around the inside. The windings are on the axle, but can't be accessed without removing the magnet carrier.

ATM I don't intend to replace #6, I intend to repair it.

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