Search found 2984 matches

by CJ
22 Feb 2020, 6:13pm
Forum: Does anyone know … ?
Topic: Ryanair bike policy
Replies: 26
Views: 11406

Re: Ryanair bike policy

Ryanair seem to have altered that bit of their terms and conditions linked to above. The same link (under heading 3.6) now says nothing about bikes being able to weigh up to 30kg. And the T&Cs never did say exactly what was meant by that, although the context suggests that it must be the same ki...
by CJ
3 Jan 2020, 6:13pm
Forum: Electric bikes
Topic: The future for ebikes?
Replies: 14
Views: 891

Re: The future for ebikes?

mercalia wrote:So the future looks bright with renewable energy sources ... Iran and Saudi can sink back into the medieval era where they belong and not affect the civilised world any more?

I note that the inventor hails from Palestine. Would that be part of your civilised world?
by CJ
3 Jan 2020, 6:00pm
Forum: Lands End to John O'Groats
Topic: What's your opinion of the Sustran Route
Replies: 17
Views: 789

Re: What's your opinion of the Sustran Route

Viewranger is better app than Maps.me, because the free mapping is Open Cycle Map that depicts all of the bikepaths as blue dashes (plus bridlepaths in green, footpaths in red) and highlights the Sustrans routes - plus it has contours. Downloading sections of this mapping for offline use is tediousl...
by CJ
11 Dec 2019, 7:43pm
Forum: Bikes & Bits – Technical section
Topic: Wide range 'period correct' Campagnolo gearing
Replies: 32
Views: 1245

Re: Wide range 'period correct' Campagnolo gearing

If the pulley cog gap isn't such a problem life is a lot simpler if you use a hanger adaptor to lower the mech. Ok may not be period correct but neither are those meccanoesqe mods either. Pulley-cog gap still matters, in spite of the best modern designs of teeth and chain, believe me. I lowered the...
by CJ
10 Dec 2019, 5:37pm
Forum: Bikes & Bits – Technical section
Topic: Wide range 'period correct' Campagnolo gearing
Replies: 32
Views: 1245

Re: Wide range 'period correct' Campagnolo gearing

Why Bother!!! Period correct? Campagnolo introduced the Rally in 1974. By then any cycle tourist in possession of an open mind (and a remarkably small amount of money) was already using a SunTour VGT. Campag's Rally arrived on the scene too late, cost too much, and whilst it may have looked the bus...
by CJ
21 Aug 2019, 9:29pm
Forum: Bikes & Bits – Technical section
Topic: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple
Replies: 91
Views: 5834

Re: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple

well yes, except that the suggested rule would only have any benefit for large wheeled bikes and the whole argument is predicated on assumptions about positions of CoGs and coefficients of tyre friction. Motorcyclists can buy machines which can lock the front wheel (even bolt upright in the dry) be...
by CJ
20 Aug 2019, 11:40pm
Forum: Bikes & Bits – Technical section
Topic: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple
Replies: 91
Views: 5834

Re: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple

And in reply to the suggestion that the Audax and/or Touring bike is dead (sorry, but I don't visit here often nowadays), I would say that it's more like the roadies have come around to our way of thinking! For now they are adopting bicycles they call road bikes or gravel bikes that have tyres of si...
by CJ
20 Aug 2019, 10:56pm
Forum: Bikes & Bits – Technical section
Topic: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple
Replies: 91
Views: 5834

Re: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple

Is there good data for chain efficiency at differing angles. I suppose a triple allows you the same spread of gears, but with shallower angles than a double, but does this produce meaningful differences in drivetrain efficiency? There is a lot of bad data, and only one good study that I am aware of...
by CJ
20 Aug 2019, 10:30pm
Forum: Bikes & Bits – Technical section
Topic: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple
Replies: 91
Views: 5834

Re: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple

Freddie wrote:What is wrong with using a 3 speed hub (+ cassette) to achieve what the front mech does?

Efficiency, dear boy, efficiency.
by CJ
3 Aug 2019, 1:49am
Forum: Bikes & Bits – Technical section
Topic: Catastrophic spoke failure. While stored..
Replies: 32
Views: 4146

Re: Catastrophic spoke failure. While stored..

See if I've got this...... The butted bit, being thinner, will be closer to yield than the elbow, being thicker. Reverse way round to fatigue, because fatigue happens where it flexes. Ok, yeah, that makes sense. Strictly speaking, all parts of the spoke flex, they simply flex by differing amounts d...
by CJ
3 Aug 2019, 12:59am
Forum: Bikes & Bits – Technical section
Topic: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple
Replies: 91
Views: 5834

Re: Audax Bike (Spa?) with Tourer Gearing & Double vs. Triple

I've run triples since the 70s and though I say so myself, I'm good at getting them to work reliably, but doubles DO work better. And having studied them very closely, having written the article on how front shifting works, I know WHY doubles work better. Front shifting works like this. The upshift ...
by CJ
2 Aug 2019, 10:43pm
Forum: Bikes & Bits – Technical section
Topic: Mudguards causing accidents....
Replies: 120
Views: 12645

Re: Mudguards causing accidents....

With any metal mudguard the risk of the guard crumpling is a lot less... I don't think so. Steel mudguards, of the 'Raleigh All Steel Bicycle' era, are admittedly so stiff as to be nigh impossible to crumple and certainly don't need more than one pair of stays. But aluminium alloy of the Spencer an...
by CJ
24 Jun 2019, 4:52pm
Forum: Bikes & Bits – Technical section
Topic: Combine Shimano flat mount road calipers with MTB levers?
Replies: 7
Views: 420

Re: Combine Shimano flat mount road calipers with MTB levers?

NickJP wrote:Is there any problem with using, for example, 105 hydraulic calipers with Deore XT levers?

I've built a bike for my wife with those components and they work perfectly well together. She's ridden it far enough with no problems to now be on the second set of front pads.
by CJ
21 Jun 2019, 1:05pm
Forum: Campaigning & Public Policy
Topic: More cycling? Less motoring?
Replies: 65
Views: 17007

Re: More cycling? Less motoring?

I think a reduction in motor traffic of 50% would be realistic I used to think that, but since I've done a little research into the amount of driving that nevertheless persists in countries that have provided for cycling in a way we can only dream of - and consequently cycle a whole lot more than B...
by CJ
18 Jun 2019, 7:28pm
Forum: Campaigning & Public Policy
Topic: Father calls for cycle ban(after son's death)
Replies: 22
Views: 4224

Re: Father calls for cycle ban(after son's death)

The A338 looks to be one of those motorway-in-all-but-name roads, about which I'd usually be quite happy with a cycling ban, since it's completely additional to the pre-existing road network and doesn't provide unique access to any adjacent premises. You can take it off the map and I can still cycle...