Search found 35913 matches

by Brucey
20 Nov 2019, 11:32am
Forum: Bikes & Bits – Technical section
Topic: Cantilever brakes - excessive pad wear
Replies: 32
Views: 840

Re: Cantilever brakes - excessive pad wear

IIRC there might be such a thing as a combined uphanger and dynamo light mount....? cheers Hi, I've not seen a combination of the two. ... I've looked and I'm dashed if I can find one now... :( maybe it was wishful thinking.... :oops: To me, the 'canti' type B&M lamp mounting looks like it won'...
by Brucey
20 Nov 2019, 11:09am
Forum: Bikes & Bits – Technical section
Topic: what's inside.... bottle dynamos and other generators
Replies: 21
Views: 512

Re: what's inside.... bottle dynamos and other generators

Bsteel wrote:AXA Trio
dynamo1.jpg


yes the internal parts are almost identical. I've not taken one of those apart; was it at all difficult?

cheers
by Brucey
20 Nov 2019, 11:05am
Forum: Bikes & Bits – Technical section
Topic: what's inside.... bottle dynamos and other generators
Replies: 21
Views: 512

Re: what's inside.... bottle dynamos and other generators

Thanks Brucey for the post, interesting. Yes, with a view towards maintenance (any that might be possible) I’d certainly like to see more on the innards of Dynamos and particularly the bottle type. Maintenance? Ha! I don't think that thought entered the minds of the designers, not on something that...
by Brucey
20 Nov 2019, 10:29am
Forum: Bikes & Bits – Technical section
Topic: what's inside.... bottle dynamos and other generators
Replies: 21
Views: 512

Re: what's inside.... bottle dynamos and other generators

ConRAD wrote:Image

on the above I assume that the left one is a DC and the right is an AC output


both AC; the Cibie has a centre brush, i.e. there is no commutator per se.

cheers
by Brucey
20 Nov 2019, 9:58am
Forum: Bikes & Bits – Technical section
Topic: what's inside.... bottle dynamos and other generators
Replies: 21
Views: 512

Re: what's inside.... bottle dynamos and other generators

both are fairly horrible in this case. Any friction in the sprung pivot also means that the dynamo cannot track a slightly uneven tyre so well, and means that slippage is never far away. The cibie (like many others, but not the right one in the photo) has the added feature that the pivot also has to...
by Brucey
20 Nov 2019, 8:49am
Forum: Bikes & Bits – Technical section
Topic: Thirty Years with a Sturmey Gear.
Replies: 71
Views: 6188

Re: Thirty Years with a Sturmey Gear.

photos of the culprit are below; Image01507.jpg The left end of the holes in the planet cage have no counterbore and the swaged part of the pin barely protrude beyond the planet cage. This means that there is barely anything retaining the pawl pin. If the pawl pin manages to drift rightwards inside ...
by Brucey
20 Nov 2019, 8:16am
Forum: Bikes & Bits – Technical section
Topic: A collation of dynamo/generator drag/efficiency data
Replies: 24
Views: 675

Re: A collation of dynamo/generator drag/efficiency data

I agree. Without more information about the exact nature of the loads and test conditions, any results have to be viewed with caution. The assumption in the tests reported in the myra link is that a typical headlight (with a halogen bulb) would contain a voltage limiting diode. For a few years this ...
by Brucey
20 Nov 2019, 1:49am
Forum: Bikes & Bits – Technical section
Topic: what's inside.... bottle dynamos and other generators
Replies: 21
Views: 512

what's inside.... bottle dynamos and other generators

Image01511.jpg on the left we see a Cibie unit, with a centre brush contact, and a wound rotor inside a stationary permanent magnet. On the right there is a more conventional design with a rotating magnet inside a claw-pole stator with an offset winding. This unit (of unknown make) also has a volta...
by Brucey
20 Nov 2019, 12:17am
Forum: Bikes & Bits – Technical section
Topic: A collation of dynamo/generator drag/efficiency data
Replies: 24
Views: 675

Re: A collation of dynamo/generator drag/efficiency data

http://www.starbike.com/images/SON/son-dynamo-hub-nabendynamo-sondeluxe-1.gif http://www.starbike.com/images/SON/son-dynamo-hub-nabendynamo-sondeluxe-2.gif other (unrelated) links http://www.pilom.de/BicycleElectronics/HubDynamo.htm http://www.myra-simon.com/bike/dynotest.html cheers
by Brucey
19 Nov 2019, 11:42pm
Forum: Bikes & Bits – Technical section
Topic: Thirty Years with a Sturmey Gear.
Replies: 71
Views: 6188

Re: Thirty Years with a Sturmey Gear.

if you want to see the difference between FW, S5, S5-1 and S5-2 hubs parts listings are here; https://hadland.wordpress.com/2012/07/02/how-to-repair-old-sturmey-archer-hubs/ FW https://hadland.files.wordpress.com/2012/07/safw.pdf S5 https://hadland.files.wordpress.com/2012/07/s5.pdf S5-1 https://had...
by Brucey
19 Nov 2019, 10:52pm
Forum: Bikes & Bits – Technical section
Topic: Thirty Years with a Sturmey Gear.
Replies: 71
Views: 6188

Re: Thirty Years with a Sturmey Gear.

where was I...?... Oh yes, carrying my bike home. Fortunately it was only a few miles and I had plenty of time to mull things over. I had no idea what had happened, but it must have been pretty bad. Unfortunately I don't have an identical rear wheel amongst my stash of spares, not quite. I could rus...
by Brucey
19 Nov 2019, 9:26pm
Forum: Bikes & Bits – Technical section
Topic: Thirty Years with a Sturmey Gear.
Replies: 71
Views: 6188

Re: Thirty Years with a Sturmey Gear.

update; A couple of years ago my ancient, cobbled together SA five speed hub finally developed a major fault. It had been used and abused for several decades/many tens of thousands of miles and had only received new ball bearings and R springs in that time. It was basically a 1964 FW with a (longer)...
by Brucey
19 Nov 2019, 8:39pm
Forum: Bikes & Bits – Technical section
Topic: Paint scraped and gouged
Replies: 5
Views: 267

Re: Paint scraped and gouged

if you are going offroad then the chain might flap about enough to damage the chainstay whatever you do. But high spring tensions and dampers (clutches) built into the RD can help stop such damage. You can buy chainstay protectors which just stick on, or there are loads of DIY solutions. Repairing p...
by Brucey
19 Nov 2019, 8:30pm
Forum: Bikes & Bits – Technical section
Topic: Smaller chainset to use with Dura Ace 9speed
Replies: 35
Views: 997

Re: Smaller chainset to use with Dura Ace 9speed

indeed. But then again there are lots of chainsets which will accept the correct size chainrings for the OP (of which he has chosen one). I suppose the main attraction of the 7700/7703 route was that the whole groupset was retained. FWIW I will happily use a smallish chainring (39T or less) as the m...