Cycling UK Forum

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The Youtube link is pointless for me.
There isn't a nut to undo, being a rim brake model and with a QR.

Seems like there's a sort of nut on one end. Both end bosses are basically round, but it has a single flat on one.
Looks like it needs a special tool to undo it as a spanner wouldn't work. Dunno how you would hold the other end.

I'll check again tomorrow and maybe take a photo or two to illustrate.

It's like much this one, but 100mm OLN.
https://www.sjscycles.co.uk/dynamos/sp- ... r-28-hole/

Wiring hub dynamo
I had to wire up the hub dynamo, I used five-strand cables that came with the front light.

I had to insert the cables into the Dynamo Bike Hub Connector Kit SP
https://www.ebay.co.uk/itm/256364258882 ... 0yEALw_wcB

Even though I twisted the 5-strand cable, the cable kept bending or unravelling when installing.

I found it difficult and time-consuming,

Question

Any view on using a double-core single-strand cable like this, say size 1 or 1.5 mm?
https://www.alibaba.com/product-detail/ ... 25093.html


So, using two separate cables I need to use a cable cover for protection.

PVC Cable Sleeving Black All Sizes Electrical Cable Tubing Earth Harness

https://www.ebay.co.uk/itm/354616857623 ... RTEALw_wcB

If you don't know if a hub is warranted for radial spoking, the following reduce the risk of ripping a chunk of the flange away:

1. Forged shell, assuming aluminium
2. Low spoke count (more metal between adjacent holes)
3. Heads out (no bending stress on flange)

I only do it on SP dynamo hubs.

geocycle wrote: ↑30 Jan 2024, 4:20pm Just to add to the list. I'm a big fan of SON hubs and have been using one for many years on the commuter. But, I also have two budget hubs as well, one with an SP and the other with a Kasai dynamo that have performed well so far. There is no detectable difference to the SON at the speeds I ride (I know the data point to drag) and the main test will be the longevity. They are built in Spa wheels who recommended the Kasai to me.

Thanks for that: we need more experiences with Kasai dynamos.

Jonathan

Just to add to the list. I'm a big fan of SON hubs and have been using one for many years on the commuter. But, I also have two budget hubs as well, one with an SP and the other with a Kasai dynamo that have performed well so far. There is no detectable difference to the SON at the speeds I ride (I know the data point to drag) and the main test will be the longevity. They are built in Spa wheels who recommended the Kasai to me.

Brucey wrote: ↑28 Jan 2024, 9:06pm

Tsarbombaad wrote: ↑28 Jan 2024, 8:27pm Unfortunately it seems that the Jtek isn't compatible with 20 inch wheels. It's strange though since the regular SP hubs are compatible.

it is probably just someone at SJS covering their own bottom, after all, what are you going to do with too much electricity?

I suppose someone might try to connect a halogen lamp without overload protection. That was a risk even with a better-matched dynamo, though. You never quite knew whether it would pop at 50mph down a long hill. Dynamos "saturate" to a large extent above design speed, but not completely, and bottles do it differently to hubs.

Tsarbombaad wrote: ↑28 Jan 2024, 8:27pm Unfortunately it seems that the Jtek isn't compatible with 20 inch wheels. It's strange though since the regular SP hubs are compatible.

it is probably just someone at SJS covering their own bottom, after all, what are you going to do with too much electricity?

PH wrote: ↑28 Jan 2024, 11:51am
Current good buys IMO are a Jtek from SJS, which I'm pretty sure is a rebranded SP. At £55 it's cheaper than any SP's I've seen, though you don't get the same level of service as you do with SP.
https://www.sjscycles.co.uk/dynamos/32- ... wer-black/

Unfortunately it seems that the Jtek isn't compatible with 20 inch wheels. It's strange though since the regular SP hubs are compatible.

Ref that servicing fpr SP hubs. It isn't as straight forward as you think.
If the hub was supplied through the retail chain which means starting with Ison they will offer the service which was about 35 quid when asked a couple of years ago. If it didn't come via them as was the case with my Exposure badged SP then they won't handle it. (Exposure wouldn't either).
I have a Sonder bike on order with a dynamo hub fitted .The latter looks to be a SP which I doubt Ison will deal with.
You can have it serviced yourself via the manufacturer which means posting to Taiwan. Same price funnily enough Or you can rebuild yourself. One bearing isn't too bad, the other is a pain.

How cheap is cheap? I have no experience of the Shimano hubs that sell for £20 - £30 but you don't have to spend much more for hubs with good reputations. I have dynamos from SON, Shimano (Alfine) and SP (Next time I'll get one that doesn't start with S, just for a change) When riding I can't distinguish between them in output or resistance, other than the SP flickers more at walking pace.
I've always considered one of the better hubs doesn't greatly increase the price of the wheel, though it's opinion, as I said I haven't tried any cheap ones.
Current good buys IMO are a Jtek from SJS, which I'm pretty sure is a rebranded SP. At £55 it's cheaper than any SP's I've seen, though you don't get the same level of service as you do with SP.
https://www.sjscycles.co.uk/dynamos/32- ... wer-black/

An extra tenner gets you the Shimano Nexus, with I think is the rim brake version of the Alfine I have, I've seen them at this price a few times, this was the first google hit
https://fawkes-cycles.co.uk/shimano-nex ... 32h-p18873

I also wonder what the second hand market is like, I haven't looked but with so many people switching to discs there might be a surplus gathering dust.

Tsarbombaad wrote: ↑28 Jan 2024, 1:18am ...
Additionally, are there any other dynamo hubs from different brands I should be aware of?.
...

There's a vast amount of useful information in previous threads.

SP, as above, and Kasai.

Jonathan

Look at the SP ones too. They are very small and efficient.

I've ran Shimano dynohubs on my 20" moultons for about a decade now with no issues whatsoever.

On the Moulton I use most I've had an SP dynamo hub for over two years with no issues.

Just do it, it'll be fine. It'll generate a little more power as it rotates quicker, but not enough to trash modern lights. I have lights that auto turn on when light gets low and you can barely even feel any drag.

New Bosch CX powered 'panzerwagon' hardtail e-bike arriving Monday with front suspension forks.

I want a German road legal front light with 'senso' mode. I doubt it will ever be ridden at night off road and if so that can be satisfied in an alternative manner. My other bikes have SON Edelux II front lights and they are perfect for my needs.

Two options come to my mind

a) buy a new SON Edelux II DC for e-bike and wire (will require soldering and dealing with cables disappearing into modern headsets with holes in them ) into the Bosch CX (4th Gen) bottom bracket motor and mount the light on the handlebars. (and possibly require a visit to a Bosch dealer to activate the light mode via its software!)

or

b) use an almost new SON Edelux II (hub dynamo version) that I already have spare + buy a SP or Kasai thru axle dyno hub and build meself a new wheel (have suitable rims and spokes already) and mount the light on the suspension fork bridge.

Are there any disadvantages of mounting front lights on suspension fork bridges?

Costs are going to be roughly similar.

Jdsk wrote: ↑18 Oct 2023, 10:09am

Pinhead wrote: ↑17 Oct 2023, 12:11pm ...
My question is, I have 2 red lights on each bike at the back, always have had 2+ even 12 years ago, I now have a Cateye AMPP 400 and 500, one on each bike flashing for "being seen", I also want a bright front light on each bike, but can not afford £300

Can anyone reply from "experience" regarding a GOOD Amazon light for the bikes please rather than me assuming most reviews are either not from people who have no real idea or sellers.
...

After the suggestions above:

• How much do you want to pay?
• Do you want it to be powered from the eBike battery, a dynamo, removable batteries, or USB charging?
• Why are you restricting the source to Amazon?

Thanks

Jonathan

Sample type is

https://www.amazon.co.uk/BIKIL-Recharge ... hdGY&psc=1