Search found 676 matches

by speedsixdave
21 Nov 2019, 7:50pm
Forum: Bikes & Bits – Technical section
Topic: Making a bike frame! need answers!
Replies: 9
Views: 466

Re: Making a bike frame! need answers!

By their natural geometry bike frames are stiff vertically but flexible laterally. If you can design a frame which is stiff laterally but more flexible vertically that may prove beneficial to the rider. Good luck!
by speedsixdave
11 Nov 2019, 1:23pm
Forum: Bikes & Bits – Technical section
Topic: Belt drive instead of chain..why? why not?
Replies: 42
Views: 1520

Re: Belt drive instead of chain..why? why not?

I used to have a Moulton TSR2 with the belt drive and a Sturmey S2C (later a SRAM Automatix) 2-speed hub gear / coaster. The bike predominantly rode a 5-mile flat commute to my previous office, and sometimes to the shops. It rarely went on journeys of more than ten miles. In this application it work...
by speedsixdave
19 Oct 2019, 10:39am
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 2802

Re: Small wheel blowouts - options?

Gents, OP here. Thanks very much for the continuing contemplation on this - some on topic and some not so much, but all interesting! I think I will investigate the front hub brake further and consider how to make it work on a leading link fork. The advantages of the front brake for me are: easy to s...
by speedsixdave
17 Oct 2019, 3:05pm
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 2802

Re: Small wheel blowouts - options?

The point about technique is that a *wrong* way also exists - and that is dragging the brakes all the way down. This is the "intuitively" safest way - if one does not know the full physics of the situation :) (or of course if your wheels/brakes are heat-proof. Or it's just damn cold.) And...
by speedsixdave
17 Oct 2019, 1:26pm
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 2802

Re: Small wheel blowouts - options?

Good stuff gents, many thanks. As ever much to chew on. Re descending and braking techniques, on a 'typical' French mountain there's not much that one can do different: the bike accelerates to a maximum velocity of perhaps 40-50mph and then you brake for the corner. That bit at the top of the Tourma...
by speedsixdave
17 Oct 2019, 11:00am
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 2802

Small wheel blowouts - options?

Hi all, I've been riding my newish Moulton Jubilee for 18 months or so now and it's a fabulous bike, subject to a few idiosyncrasies that we have covered previously on this forum. There is however one serious issue that troubles me greatly - front wheel overheating blowouts. I toured in the Pyrenees...
by speedsixdave
26 Sep 2019, 7:01pm
Forum: Touring & Expedition
Topic: Panniers for Topeak Super Tourist DX rack?
Replies: 4
Views: 322

Re: Panniers for Topeak Super Tourist DX rack?

We have three of these racks on various bikes. My cheap Aldi Ortlieb-copies work fine but for touring we use Carradice Carradry panniers. In full disclosure we changed the hooks on the Carradice panniers for Rixen & Kaul clips which were less awkward on the lower pannier rail. I note that Carrad...
by speedsixdave
29 Aug 2019, 5:29pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 214
Views: 12731

Re: Moulton TSR rear pivot

squeaker wrote:
Mick F wrote:How does it "self lubricate"?
IIRC, the bearing material is a matrix of, essentially, hard porous bearing material with 'solid' lubricant in the pores.


Yep, apparently an Oilite bearing.

https://en.wikipedia.org/wiki/Oilite
by speedsixdave
27 Aug 2019, 8:55pm
Forum: Bikes & Bits – Technical section
Topic: Moulton TSR rear pivot
Replies: 214
Views: 12731

Re: Moulton TSR rear pivot

FWIW the improved pivot on my Jubilee (same as the SST I think) is self-lubricating, but I fight a constant battle against creaking. If the bolts are too loose the back end moves, if they're too tight the thing creaks. Sometimes the creak goes away for a month or so following loosening / tightening,...
by speedsixdave
11 Aug 2019, 3:32pm
Forum: Bikes & Bits – Technical section
Topic: 26" vs 650b
Replies: 4
Views: 421

Re: 26" vs 650b (or 559 vs 584!)

Thanks gents. Much as I suspected, not a lot of real-world difference. Yes I appreciate the lack of novelty in the 650b wheel size, it was a bit of a surprise to me when it started to become fashionable again. I remember also the brief fashion for 650c wheels (571 BSD) on road bikes in about 1996. N...
by speedsixdave
10 Aug 2019, 11:53pm
Forum: Bikes & Bits – Technical section
Topic: Things we need not invented yet
Replies: 91
Views: 2832

Re: Things we need not invented yet

The wheel strength thing has veered somewhat off topic I think, and if strong wheels are the goal, small wheels are an answer. However they come with some issues. Overheating is one, and comfort combined with good roadholding combined with low rolling resistance is another. So we're back to needing ...
by speedsixdave
10 Aug 2019, 9:20am
Forum: Bikes & Bits – Technical section
Topic: 26" vs 650b
Replies: 4
Views: 421

26" vs 650b

Morning all, My touring / commuting bike - The Battleship - has 26" (559) wheels with 50mm tyres. While slogging to work in a headwind recently, I wondered whether its next set of wheels (there is a long and complicated set of reasons for thinking about new wheels) should be the fashionable 650...
by speedsixdave
9 Aug 2019, 10:09am
Forum: Bikes & Bits – Technical section
Topic: Things we need not invented yet
Replies: 91
Views: 2832

Re: Things we need not invented yet

Suspension with no drawbacks
by speedsixdave
9 Aug 2019, 9:56am
Forum: Bikes & Bits – Technical section
Topic: Cycling dead ends.
Replies: 95
Views: 3424

Re: Cycling dead ends.

Browning Automatic transmission: hinged triple chainrings that shifted the chain without a front derailleur. About 1986?
by speedsixdave
27 Jul 2019, 11:27am
Forum: Does anyone know … ?
Topic: What kind of valve - and how do I remove it?
Replies: 14
Views: 2695

Re: What kind of valve - and how do I remove it?

Mike Sales wrote:
speedsixdave wrote: Admittedly if the little rubber tube inside perishes and you don't have a spare, you're walking home.


Replacement Woods cores are available that do not have the rubber tube. They work in a different way which is also easier to pump.



Come on then! All aboard the Woods Bus!

:D