Search found 145 matches

by RJC
17 Apr 2018, 11:41am
Forum: Bikes & Bits – Technical section
Topic: Dynamo Lighting - fit and forget?
Replies: 132
Views: 7348

Re: Dynamo Lighting - fit and forget?

I think the Cyo circuitry has been described as a voltage halver/current doubler. If a white LED needs say 3.5V at ~3Watts the input will rise to about 7V 0.5A which is converted to 3.5V 1A internally, so the LED in the front light is effectively the voltage limiter, since the current is limited by ...
by RJC
11 Jan 2018, 11:47am
Forum: Bikes & Bits – Technical section
Topic: Replacement for HyRd disc brakes - suggestions?
Replies: 57
Views: 4323

Re: Replacement for HyRd disc brakes - suggestions?

Hi Brucey,

Thanks for the report.
Do you think the Juin Tech/Acor hybrid disc brakes are any better? Not many of these about I imagine so not much anecdotal evidence to go on.
by RJC
9 Dec 2017, 1:17am
Forum: Bikes & Bits – Technical section
Topic: Touring bicycle frame weight - info gathering
Replies: 149
Views: 8591

Re: Touring bicycle frame weight - info gathering

iow wrote:
RJC wrote:Update:
Stainless forks in KVA MS3 (similar PH S/S to Reynolds 931 but not identical) with canti mounts and uncut 320mm steerer; 850gm.



where did you buy the fork from?


Custom build by Richard Hallett as the offset was a bit larger than anything off the peg. Went for SS partly for novelty.
by RJC
7 Dec 2017, 2:20pm
Forum: Bikes & Bits – Technical section
Topic: Touring bicycle frame weight - info gathering
Replies: 149
Views: 8591

Re: Touring bicycle frame weight - info gathering

Spa Cycles 57cm titanium tourer with headset cups & some foam wrapping 1916gm (frame weight ~1.8-1.85Kg) Spa tourer steel forks uncut 1128gm I did investigate Condor steel touring forks which were claimed to be 800gm but turned out to be slightly heavier than the Spa forks.. Update: Stainless f...
by RJC
7 Nov 2017, 3:21pm
Forum: Bikes & Bits – Technical section
Topic: Lighting page updated (and CJ mentioned) but.....
Replies: 20
Views: 1434

Re: Lighting page updated (and CJ mentioned) but.....

The supernova site mentioned that the German bike lighting regs were updated this summer to allow high beam/dipped lights.
A description of these updates would be useful.
by RJC
10 Oct 2017, 1:39pm
Forum: Bikes & Bits – Technical section
Topic: Touring bicycle frame weight - info gathering
Replies: 149
Views: 8591

Re: Touring bicycle frame weight - info gathering

I did investigate Condor steel touring forks which were claimed to be 800gm but turned out to be slightly heavier than the Spa forks.. I also have that Tange fork, bought for geometry and fittings, on my kitchen scales it comes in a a couple of grams over 1kg with the fork cut down to 300mm. Condor...
by RJC
4 Oct 2017, 9:33am
Forum: Bikes & Bits – Technical section
Topic: Touring bicycle frame weight - info gathering
Replies: 149
Views: 8591

Re: Touring bicycle frame weight - info gathering

Spa Cycles 57cm titanium tourer with headset cups & some foam wrapping 1916gm (frame weight ~1.8-1.85Kg)
Spa tourer steel forks uncut 1128gm
I did investigate Condor steel touring forks which were claimed to be 800gm but turned out to be slightly heavier than the Spa forks..
by RJC
17 Aug 2017, 2:12pm
Forum: Bikes & Bits – Technical section
Topic: Roller brake vs long drop dual caliper
Replies: 22
Views: 1088

Re: Roller brake vs long drop dual caliper

Is this for a front or rear brake? The IM70 is one of the better examples compared to roller brakes further down the scale. The IM80 series are even bigger but not heard anyone say they are usefully improved. My limited experience is that roller brakes are OK but it can be tricky to modulate for str...
by RJC
2 Feb 2017, 8:45pm
Forum: Bikes & Bits – Technical section
Topic: SP Dyno Hubs Service Options from UK Distributor
Replies: 14
Views: 1186

Re: SP Dyno Hubs Service Options from UK Distributor

That's why I like Sturmey Archer dynohubs, fairly easy to strip and service/repair if required + parts available (not that I've ever had to repair one......Yet). User friendly I believe it's called. I've renewed the bearings in a couple of them, though they were fairly abused over a 6yr period. :ro...
by RJC
20 May 2016, 2:42am
Forum: Bikes & Bits – Technical section
Topic: Tools you never knew you needed until you got one
Replies: 170
Views: 13434

Re: Tools you never knew you needed until you got one

the dial sort are pretty good (and don't need batteries) but...twice a year Aldi and Lidl have digital vernier calipers for about ten quid. These are tops! Just make sure you have a few spare batteries to hand.... cheers The Lidl digital calipers I bought a few years ago which take a 1p size coin c...
by RJC
25 Feb 2016, 11:37am
Forum: Bikes & Bits – Technical section
Topic: Spa Dynamo & Wheel Bundle
Replies: 9
Views: 732

Re: Spa Dynamo & Wheel Bundle

Anyone have any experience of the newer & smaller SV-9 ?
I've not yet seen any bad reports, but reports of any nature are still elusive.
I sometimes toy with the idea of giving my Brompton a hub dynamo upgrade.
by RJC
11 Sep 2015, 9:11am
Forum: Bikes & Bits – Technical section
Topic: DT Revolution spokes
Replies: 20
Views: 1574

Re: DT Revolution spokes

No personal experience of 1.5mm mid section spokes but Gerd Schraner says in his wheel building book that after some bad experiences he won't use anything less than 2.0/1.8/2.0mm and brass nipples on the rear drive side. I guess the main issue is spoke wind up.

Robin
by RJC
26 Jul 2015, 5:28pm
Forum: Bikes & Bits – Technical section
Topic: Alhonga Deep Drop Brakes
Replies: 5
Views: 1731

Re: Alhonga Deep Drop Brakes

The chromed bits on some, maybe all, Tektro brakes seem to rust quickly. I haven't noticed any rust on the Alhonga brakes on my Brompton.
by RJC
6 May 2015, 4:07pm
Forum: Bikes & Bits – Technical section
Topic: Dyno hubs
Replies: 24
Views: 1643

Re: Dyno hubs

by RJC
26 Feb 2015, 8:16pm
Forum: Bikes & Bits – Technical section
Topic: hub dynamo and iphones
Replies: 21
Views: 1800

Re: hub dynamo and iphones

I suspect some of the dynamo powered USB adapters overcome the ~0.5A limit provided by from a dynamo is to load the dynamo in such a way that it is generating say 10V 0.5A and turn this into 5V 1A via a switched mode convertor.