Search found 58 matches

by Randy_Butternubs
17 Oct 2018, 3:48pm
Forum: Does anyone know … ?
Topic: Halfords to sell Bromptons
Replies: 50
Views: 2871

Re: Halfords to sell Bromptons

They're UK-made in part because it allows the company to keep a close eye on production and keep their trade secrets, know-how etc. close to their chests, and partly for the branding value of being able to stick a union jack on the side. The London thing I've never been quite sure of; I suppose as ...
by Randy_Butternubs
15 Jun 2018, 9:21pm
Forum: Bikes & Bits – Technical section
Topic: cheap (hand) drill that will take 8mm drill bits
Replies: 13
Views: 536

Re: cheap (hand) drill that will take 8mm drill bits

Stepped drill bits are great for thin/sheet materials. Normal bits have a tendency to take a big bite and start self feeding like a screw in thin materials. This results in a ragged, non circular hole. Even if they don't do this you often get a triangular hole if you are just enlarging an existing o...
by Randy_Butternubs
2 Jun 2018, 4:16pm
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

Hang on a sec here. If you take the argument to extreme, the larger the diameter of the front wheel, the longer the trail? The smaller the wheel, the shorter the trail? If you had a zero diameter front wheel, you would have zero trail? ........... or am I wrong? If the wheel had 0 diameter and no o...
by Randy_Butternubs
2 Jun 2018, 2:28pm
Forum: Bikes & Bits – Technical section
Topic: Metric spanners
Replies: 14
Views: 649

Re: Metric spanners

An adjustable is handy but they often round off the flats. Not the Stanley adjustable spanner with clamp though. The clamping device is similar to that on a mole wrench and by clamping the spanner on a nut it doesn't drop off or slip. +1. That was one of the first tools I ever bought and it's alway...
by Randy_Butternubs
2 Jun 2018, 11:58am
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

That different people interact differently with different bikes is hardly a surprise. So it's no surprise that just as you and 531colin don't get on with Brom handling, there's plenty (like me) that do. And for those that do get on with a Brom, that a Tern may be more stable is a bit of a moot poin...
by Randy_Butternubs
1 Jun 2018, 8:26pm
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

This is an interesting blog post on the work of Jim Papadopoulos, who is also active in the comments. Papadopoulos seems to be the foremost expert on bicycle self-steering as far as I can tell. https://janheine.wordpress.com/2011/04/27/bicycle-stability-everything-works-together/ Key excerpts from J...
by Randy_Butternubs
1 Jun 2018, 7:35pm
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

pjclinch, I'm sorry, that just reads like excuses for bad design. There are designs that it is nigh on impossible for anyone to ride consistently in a hands off position. This is not the same thing as riding a unicycle and is not a skill to be learnt (as riding a unicycle is). A bicycle that has a ...
by Randy_Butternubs
31 May 2018, 10:36pm
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

Re: the tendancy of the wheel to fall in on itself: isn't that more a question of the slackness of the steering head angle? I found the Brompton very easy to push along by the saddle without the front wheel flopping to one side. I can't say the same of my full-size bikes. I do believe it is a funct...
by Randy_Butternubs
31 May 2018, 3:06pm
Forum: Does anyone know … ?
Topic: why Brompton forks have such low trail?
Replies: 35
Views: 1332

Re: why Brompton forks have such low trail?

The first time I rode a Brompton I found it comically unstable but I got used to it in a few minutes and started to appreciate it for weaving around cars. I didn't find it required any particular effort to hold a line but I didn't try riding without my hands. Having some weight on the front carrier ...
by Randy_Butternubs
11 May 2018, 9:36pm
Forum: Does anyone know … ?
Topic: 8.5 mile commute for a beginner cyclist?
Replies: 19
Views: 1918

Re: 8.5 mile commute for a beginner cyclist?

If you don't know how, practice puncture repair at home. There are good videos on the internet -just keep taking the tyres off and on until it's easy. It seems like a lot of people never address it and live in fear of punctures. Once you are good at it it's easy, quick and effortless* *Some tyres/ri...
by Randy_Butternubs
9 May 2018, 4:11pm
Forum: Bikes & Bits – Technical section
Topic: Vittoria Voyager - Are these 2 tyres the same? Any Good?
Replies: 5
Views: 894

Re: Vittoria Voyager - Are these 2 tyres the same? Any Good?

IIRC it's only the Hypers with the folding bead that have the supple, 120tpi casing. I think wire-beaded Hypers exist but have the less supple casing. Vittoria switched up the naming of their tyres at one point which adds confusion - I think it was the old Randonneur Pro that is now called the Voyag...
by Randy_Butternubs
27 Apr 2018, 6:07pm
Forum: Bikes & Bits – Technical section
Topic: Pumps
Replies: 21
Views: 1144

Re: Pumps

Those ones from Lezyne like the Road Drive are pretty good. . . . . . It does screw on. This caught me out once but I didn't have much trouble with it - just screwing the valve core back on hard with my fingers and screwing on the pump lightly was enough to fix it until I got home and nipped up the...
by Randy_Butternubs
27 Apr 2018, 12:39pm
Forum: Bikes & Bits – Technical section
Topic: Two-bolt seatpost designs
Replies: 32
Views: 2926

Re: Two-bolt seatpost designs

Although accessing the bolt heads may be a problem with the Campagnolo posts, the design has the advantage that the pivot for the lower jaw has a small radius. I haven’t managed to find photos of a disassembled Nitto, but I imagine the semi-cylindrical trough in which the lower clamp rests has a la...
by Randy_Butternubs
24 Apr 2018, 4:52pm
Forum: Bikes & Bits – Technical section
Topic: Two-bolt seatpost designs
Replies: 32
Views: 2926

Re: Two-bolt seatpost designs

I note that those three downsides of the Deda would not be present with the Nitto S83. Yes! I was almost going to add that having rotating collars in the top clamps rather than at the bottom would give the best of both and it looks like that's exactly what they've done. It does cost two or three ti...
by Randy_Butternubs
24 Apr 2018, 4:25pm
Forum: Bikes & Bits – Technical section
Topic: Two-bolt seatpost designs
Replies: 32
Views: 2926

Re: Two-bolt seatpost designs

I have a Deda Elementi RS01 seatpost that works in a similar way. Adjustment is done with allen keys from beneath. http://bestbiking.nl/content/images/thumbs/0000260_deda-rs-01-zadelpen.jpeg Instead of the screws threading into rotating collars, the top clamp angle is kept the same but they are roun...