Search found 289 matches

by JakobW
21 Feb 2020, 12:00pm
Forum: Does anyone know … ?
Topic: British Cycling Member no discounts on Brompton
Replies: 4
Views: 161

Re: British Cycling Member no discounts on Brompton

Brompton the company are pretty hard-line on price maintenance, which is one of the reasons they're so strict about only supplying authorised retailers. IIRC they only allow discounts on previous season's or discontinued bikes (accessories they're slightly less strict about), so waiting until the au...
by JakobW
10 Feb 2020, 6:56pm
Forum: Bikes & Bits – Technical section
Topic: New style Brompton Sturmey Shiftet
Replies: 5
Views: 389

Re: New style Brompton Sturmey Shiftet

AFAIK you can just use any other SA shifter for the rear hub; the old-skool trigger ones are nigh-indestructible, aren't they? And cheap.
by JakobW
9 Feb 2020, 6:07pm
Forum: Bikes & Bits – Technical section
Topic: New style Brompton Sturmey Shiftet
Replies: 5
Views: 389

Re: New style Brompton Sturmey Shiftet

Whilst I really like the ergonomics of the shifters, they do appear to have internals made of finest cheese. The no return seems to be a known issue; my dealer replaced my RH shifter no questions asked.
by JakobW
2 Feb 2020, 3:03pm
Forum: Bikes & Bits – Technical section
Topic: IGH lubrication; a smoking gun.
Replies: 159
Views: 20373

Re: IGH lubrication; a smoking gun.

My OH's been offered a bike with a Nexus SG-C6001-8 disc braked hub for a good price - apparently it's spent most of its life in a garage, but I doubt it's had much maintenance. My OH wants to use it as an all-weather commuter, so I suspect better lubrication is a good idea. If I've understood Bruce...
by JakobW
22 Dec 2019, 9:42pm
Forum: Bikes & Bits – Technical section
Topic: What considerations for buying a new Brompton bike
Replies: 31
Views: 1369

Re: What considerations for buying a new Brompton bike

I was told the thing about most people wanting the stiff block by a Brompton dealer mechanic. I think I misunderstood what you meant by what had changed; the bike's basic suspension design is the same, but Brompton claim the new block has different materials and so is suitable for a wider range of u...
by JakobW
22 Dec 2019, 7:51pm
Forum: Bikes & Bits – Technical section
Topic: What considerations for buying a new Brompton bike
Replies: 31
Views: 1369

Re: What considerations for buying a new Brompton bike

AIUI they've not changed the basic suspension design; it's just that people overwhelmingly wanted stiffer blocks, and only very rarely wanted something softer. So now there's only one block offered, which is similar to the old 'stiff' one; if you want anything else you have to find NOS or go afterma...
by JakobW
22 Dec 2019, 4:46pm
Forum: Bikes & Bits – Technical section
Topic: What considerations for buying a new Brompton bike
Replies: 31
Views: 1369

Re: What considerations for buying a new Brompton bike

It's worth noting that Brompton have continually tweaked the bikes, so modern ones have more or less significant improvements over older models. For instance, all bikes now come with a stiff suspension block; the newer brakes and all-metal brake levers are more effective; modern M-bars are shallower...
by JakobW
22 Nov 2019, 7:10pm
Forum: Bikes & Bits – Technical section
Topic: How Old is Your Trangia ..
Replies: 46
Views: 2175

Re: How Old is Your Trangia ..

Sadly over the years they've been cheapened - the old riveted-on strap loop is now a stamped slot which is very difficult to use and I suspect the quality of the aluminium is lower as they seem a little thinner and softer - a real shame. I don't know about softer, but aren't the more modern 'Ultral...
by JakobW
21 Oct 2019, 5:08pm
Forum: Does anyone know … ?
Topic: Bikes and air pockets (General not technical)
Replies: 13
Views: 996

Re: Bikes and air pockets (General not technical)

the Bernoulli principal: half the people argue it keeps planes in the air, the (other) half disagree. Really? What is the counter argument? Air flows over the top of the wing travels faster that below the wing, the pressure difference produces lift. If the upward lift force is greater than the down...
by JakobW
21 Oct 2019, 4:23pm
Forum: Does anyone know … ?
Topic: Bikes and air pockets (General not technical)
Replies: 13
Views: 996

Re: Bikes and air pockets (General not technical)

(Drifting OT...) There's a common incorrect explanation for wing lift that relies on shape of a typical aerofoil. According to this, you imagine two air molecules at the leading edge; if one goes over the top of the aerofoil and one under the bottom and they meet at the trailing edge, then the one t...
by JakobW
15 Oct 2019, 8:14pm
Forum: Bikes & Bits – Technical section
Topic: Amusing video about Cervelo being shoddy
Replies: 31
Views: 1999

Re: Amusing video about Cervelo being shoddy

I notice that Rivendell are also selling Tange cup-and-cone BBs; from a Grant P blog post I understand he convinced them to do a run with spindle lengths suitable for road doubles and triples (apparently most quality cup-and-cone BBs made these days are for track - Keirin? - use). They are things of...
by JakobW
15 Oct 2019, 12:04pm
Forum: Bikes & Bits – Technical section
Topic: Night lights, side of bars?
Replies: 14
Views: 569

Re: Night lights, side of bars?

Yeah, the rationale is that at night people will use the light as their reference point for your position; if the light were all the way over to the left then there could misjudge how much space they had to give you. I think there are similar rules for how far from the body edge car headlights can be?
by JakobW
5 Oct 2019, 7:32pm
Forum: Does anyone know … ?
Topic: A"cute bike" with an acute angle-sadly
Replies: 26
Views: 1077

Re: A"cute bike" with an acute angle-sadly

I suppose about half of my bikes are step-throughs (does a Brompton count I wonder?); for town/utility biking they're far more practical, especially when wearing civvies. OTOH as a tall and fairly powerful rider I prefer the reduced flex of a diamond frame for spirited riding or touring.
by JakobW
4 Oct 2019, 8:11am
Forum: Does anyone know … ?
Topic: Vintage Bicycle Advertisements; good, bad. ugly...
Replies: 559
Views: 19574

Re: Vintage Bicycle Advertisements; good, bad. ugly...

Interesting; did police have to buy their own cycles, or was this just advertising pointing out that you too could own one of these Leviathans?
by JakobW
30 Sep 2019, 11:49am
Forum: Does anyone know … ?
Topic: Carbon v steel frames v Gravity (Non Technical)
Replies: 8
Views: 577

Re: Carbon v steel frames v Gravity (Non Technical)

Gallileo explained all this 400+ years ago. Ignoring air resistance both bikes will descend at the same rate. Well yes, but the OP said nothing about ignoring wind resistance; in the real world it's likely to be the biggest factor in downhill performance. Ignoring rolling resistance, the bikes will...