Search found 2017 matches

by rogerzilla
28 Oct 2021, 2:54pm
Forum: Does anyone know … ?
Topic: Powder coating
Replies: 2
Views: 27

Re: Powder coating

Powdercoating can look good if (a) the frame isn't lugged and (b) you pay for an extra lacquer coat, which gives it the gloss of normal paint. There's usually something minor wrong when it comes back, but you pays your money, etc.
by rogerzilla
27 Oct 2021, 8:57pm
Forum: Wanted
Topic: Moulton series 1 front rack - now found, thanks
Replies: 4
Views: 167

Re: Moulton series 1 front rack

One came up on eBay. Finally. The chap who used to make the repro racks stopped a few years ago, btw. Found it in the magazine.
by rogerzilla
26 Oct 2021, 4:23pm
Forum: Bikes & Bits – Technical section
Topic: SP dynamo hub
Replies: 23
Views: 862

Re: SP dynamo hub

How has it failed?
by rogerzilla
25 Oct 2021, 10:01pm
Forum: Bikes & Bits – Technical section
Topic: Brompton steering geometry
Replies: 16
Views: 435

Re: Brompton steering geometry

Thorn expedition tourers are odd - very floppy steering, too quick by road racing standards. But they don't try to wag their tails when you honk up hills with 40lb of gear on the back, so they are well-designed for the job, even if not the best to ride unladen.
by rogerzilla
25 Oct 2021, 5:49pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 491
Views: 23937

Re: Moulton TSR rear pivot

simonineaston wrote: 25 Oct 2021, 5:34pm
Bikes built in Kirkby
As an aside, I congratulate you on spelling Kirkby correctly. I've lost count of the number of Moulton enthusiasts who insist the place is spelt with only one k.
Half my family are scousers and the other half are wackers, so I have no excuse!
by rogerzilla
25 Oct 2021, 5:45pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 491
Views: 23937

Re: Moulton TSR rear pivot

You should see their idea of frame alignment. The main frame is ok, but the spike...

I'm tempted to dock it to 2" and cap it. But then the seat tube might break.
20211025_171515.jpg
by rogerzilla
25 Oct 2021, 5:39pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 491
Views: 23937

Re: Moulton TSR rear pivot

Yay!
20211025_171201.jpg
by rogerzilla
25 Oct 2021, 4:04pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 491
Views: 23937

Re: Moulton TSR rear pivot

BTW the original Moulton design, ie the early F frames, all had nylon bushes
If only that were true :D

Early F frames, certainly until 1964, had brass or bronze bushes, and they can be well stuck in place. Bikes built in Kirkby, a factory with standards that would make the worst Chinese tat foundry blush, are especially bad, as apparently the pivot tubes were under-reamed and they just forced the bushes in. And they didn't know what grease was.

I have a 1964 Speed currently soaking in Plus Gas. The bolt and pivot are out, which is half the battle. The bushes apparently need drilling out in some cases. I really hope it doesn't come to that.
by rogerzilla
25 Oct 2021, 3:49pm
Forum: Bikes & Bits – Technical section
Topic: Brompton steering geometry
Replies: 16
Views: 435

Re: Brompton steering geometry

The Moulton (and Brompton) have little trail because of their small wheels. The distance between the tyre patch and the point the steering axis intersects the road is only about half that with a 700c wheel, if the head angle and offset were equal. You could add trail with less (or zero) offset, as you say, to make the bike less twitchy.

Moulton F frames also suffer from changing steering geometry under braking (the head angle increases as the front suspension dives), something addressed to a greater or lesser extent by the leading-link designs of the AM, TSR, etc.
by rogerzilla
24 Oct 2021, 5:57pm
Forum: Wanted
Topic: Sturmey-Archer FW compensating springs
Replies: 0
Views: 73

Sturmey-Archer FW compensating springs

Anyone got any that are in spec (at least 1 9/16" long, excluding collar) that they would be willing to part with? Mine turn out to be under 1 1/2" long on two hubs, which explains the slipping in gear 2. I expect someone left them parked in the wrong gear for decades!
by rogerzilla
24 Oct 2021, 10:21am
Forum: Does anyone know … ?
Topic: Queensbury Tunnel (Halifax/Bradford )
Replies: 10
Views: 786

Re: Queensbury Tunnel (Halifax/Bradford )

Tunnels are periodically very expensive to maintain and cyclists don't pay to use them (directly). I'm amazed any are open to us.
by rogerzilla
24 Oct 2021, 7:32am
Forum: Bikes & Bits – Technical section
Topic: Brompton steering geometry
Replies: 16
Views: 435

Re: Brompton steering geometry

I've never seen it quoted. Remember it slackens when you sit on the bike, as the rear end squats. How much, depends on the type of suspension block.
by rogerzilla
21 Oct 2021, 8:37pm
Forum: Bikes & Bits – Technical section
Topic: socket cap bolts
Replies: 13
Views: 616

Re: socket cap bolts

M5 on anything recent. 2BA on older British bikes.
by rogerzilla
21 Oct 2021, 6:36am
Forum: Does anyone know … ?
Topic: ...a good replacement for the Bic biro lid?
Replies: 27
Views: 899

Re: ...a good replacement for the Bic biro lid?

The only time I use a weakly magnetic pointer is for M323 or M324 pedals. One of the races is so deeply recessed that it's the only way. The stickiness of the grease has to be stronger than the magnetism.
by rogerzilla
18 Oct 2021, 10:05pm
Forum: Does anyone know … ?
Topic: ...a good replacement for the Bic biro lid?
Replies: 27
Views: 899

Re: ...a good replacement for the Bic biro lid?

Mick F wrote: 18 Oct 2021, 6:53pm Not clicked on the YouTube link...
They suffer zero "wear particles".
If you did, you'd see ball bearings are rather easily magnetised, and stay like that. So any metal worn from the races or balls sticks to the balls. Unless you have a microscope, you wouldn't see them.