Search found 377 matches

by Greystoke
11 Jan 2021, 8:42pm
Forum: Bikes & Bits – Technical section
Topic: Dented top tube; DIY repair
Replies: 22
Views: 1160

Re: Dented top tube; DIY repair

I've repaired quite a few cars that looked a lot like father Ted's above :shock:
by Greystoke
10 Jan 2021, 9:29am
Forum: Bikes & Bits – Technical section
Topic: Saddle choice/strange numbness
Replies: 15
Views: 735

Re: Saddle choice/strange numbness

Been there and tried all sorts.
Harder seat with cutout, lowered and nose down is the answer.
Just bought a selle SMP but it's en-route in the post so can't confirm. However that saddle is the one that comes up as the answer in a lot of internet searches....under £50 delivered from Halfords.
by Greystoke
9 Jan 2021, 3:15pm
Forum: Bikes & Bits – Technical section
Topic: 1.5 watt dynohub - inferior lighting performance?
Replies: 9
Views: 514

Re: 1.5 watt dynohub - inferior lighting performance?

The modern led lights use (mostly) much less than their halogen equivalents hence why the 1.5w hub dynamos were made. I'd imagine they are more efficient....ie less pedal effort. Led lights rarely give true electrical loads just saying 3w refers to it's ability to run on a standard dynamo.....they'l...
by Greystoke
7 Jan 2021, 2:26pm
Forum: Bikes & Bits – Technical section
Topic: Hub Generators; reactive loading puts new slant on efficiency claims.
Replies: 31
Views: 1564

Re: Hub Generators; reactive loading puts new slant on efficiency claims.

It was a Schmidt e6 and the secondary light wired in series used a capacitor to enable the second light to illuminate at lower speed. I worked out the capacitor value probably 25-30 years ago for a bottle dynamo and it worked well. A few years ago I went to a hub dynamo and changed the capacitor to ...
by Greystoke
7 Jan 2021, 1:27pm
Forum: Bikes & Bits – Technical section
Topic: Hub Generators; reactive loading puts new slant on efficiency claims.
Replies: 31
Views: 1564

Re: Hub Generators; reactive loading puts new slant on efficiency claims.

I've used power faction correction for years running twin halogen lamps on both bottle and hub dynamos....still do now.
I recall that there was even a secondary light from a big manufacturer that had a capacitor in it as standard.
by Greystoke
6 Jan 2021, 2:21pm
Forum: Bikes & Bits – Technical section
Topic: Winterproofing my bike.
Replies: 24
Views: 1456

Re: Winterproofing my bike.

I think lots of us on here face a never ending battle to keep a derailleur bike running well thru winter. Round here with tractors etc after a ride despite mudguards, mudflap etc a rather coarse grinding paste gets into everything. I've tried all sorts and for me old engine oil on the chain after mo...
by Greystoke
1 Jan 2021, 8:50am
Forum: Does anyone know … ?
Topic: ...pros and cons of a tricycle? Sidecar?
Replies: 20
Views: 690

Re: ...pros and cons of a tricycle? Sidecar?

I saw many tricycles in my youth time trialing. Never see one now.
Could've done with one myself the last 2 days....back roads were sheet ice here and unsafe to cycle a normal bike on.
by Greystoke
30 Dec 2020, 9:59pm
Forum: Bikes & Bits – Technical section
Topic: LED verses incandescent bulbs front lamp
Replies: 102
Views: 6683

Re: LED verses incandescent bulbs front lamp

They're in series, so run the dynamo at 12v, it's a constant current source so wiring the second lamp in series with a shorting switch for low speed over runs the dynamo to compensate. This worked previously for years with a bottle dynamo but now with a hub dynamo. I use a capacitor to reduce the sp...
by Greystoke
30 Dec 2020, 2:48pm
Forum: Bikes & Bits – Technical section
Topic: LED verses incandescent bulbs front lamp
Replies: 102
Views: 6683

Re: LED verses incandescent bulbs front lamp

I've previously used a pair of mr11/mr16 led bulbs with a wattage of about 3w apiece as they are designed for AC use and have built in lenses. But They don't have cutoffs as the light isn't asymmetric so you can dazzle other road users. My preferred lighting is 2 off halogen dynamo lights....I use t...
by Greystoke
30 Dec 2020, 11:36am
Forum: Bikes & Bits – Technical section
Topic: LED verses incandescent bulbs front lamp
Replies: 102
Views: 6683

Re: LED verses incandescent bulbs front lamp

I take it the led bulbs are push fit not screw in?
by Greystoke
29 Dec 2020, 9:29am
Forum: Bikes & Bits – Technical section
Topic: Nuvinci hub
Replies: 11
Views: 603

Re: Nuvinci hub

Very interesting thread. In real terms how "inefficient" is this hub? I'm fighting a losing battle keeping derailleur gears working well in this weather. Every ride seems to cover everything in fine grinding paste. The hub gear route seems to make much more sense and the n380 has a big ran...
by Greystoke
25 Dec 2020, 3:41pm
Forum: Bikes & Bits – Technical section
Topic: Bottom bracket tap
Replies: 10
Views: 464

Re: Bottom bracket tap

I used an old cup which had a high carbon content (tested with grinder) and made a basic tap from it.
First few threads are a bit worn, someone before me cross threaded it. It's back together now but if the taps were cheap enough I'd buy a set
by Greystoke
24 Dec 2020, 9:34pm
Forum: Bikes & Bits – Technical section
Topic: Bottom bracket tap
Replies: 10
Views: 464

Re: Bottom bracket tap

It's a basic cup & cone square taper bottom bracket 3RMC is the size.
I've fitted it and all is ok but the threads need recutting.
I'll see if I can get a set cheap, if not bike shop as you suggest
Thanks
by Greystoke
24 Dec 2020, 6:24pm
Forum: Bikes & Bits – Technical section
Topic: Bottom bracket tap
Replies: 10
Views: 464

Bottom bracket tap

Anyone know what thread a typical 3rmc square taper MTB bottom bracket will be?
I'm assuming armed with the above that ebay can source one.
Bottom bracket thread starting is getting badly worn.
by Greystoke
20 Dec 2020, 7:50am
Forum: Bikes & Bits – Technical section
Topic: LED verses incandescent bulbs front lamp
Replies: 102
Views: 6683

Re: LED verses incandescent bulbs front lamp

I'm interested in the outcome cycle tramp.
What's the light output like? Beam shape etc?