Search found 2979 matches

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: 5764

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: 5764

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: 5764

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: 5764

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: 4129

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: 5764

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: 104
Views: 11563

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: 400

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: 64
Views: 16413

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: 4177

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...
by CJ
18 Jun 2019, 6:39pm
Forum: Bikes & Bits – Technical section
Topic: Simple guide to worn rear cassette
Replies: 38
Views: 2181

Re: Simple guide to worn rear cassette

...if you want to find such link for a bicycle chain, 'half link' is the term that is likely to be most productive when searching the interweb. Thank you for inviting me to the Humpty Dumpty world ("when I use a word, it means just what I choose it to mean") of BMX! Common use of the term...
by CJ
17 Jun 2019, 5:07pm
Forum: Bikes & Bits – Technical section
Topic: Twisting v brakes
Replies: 2
Views: 241

Re: Twisting v brakes

I think you mean pliers and my answer is maybe. The noodle 'stirrup' will surely be weaker after the forcing open and probably remain somewhat distorted after pinching together again, so the addition of a zip-tie will help to keep the noodle aligned correctly. BUT a brake is a safety-critical compon...
by CJ
17 Jun 2019, 4:53pm
Forum: Bikes & Bits – Technical section
Topic: Simple guide to worn rear cassette
Replies: 38
Views: 2181

Re: Simple guide to worn rear cassette

I shall still not be sure what folk mean when they say 'just take a link out of the chain'... Oh come off it, they obviously don't mean anything more precise than when they say "I'll just take a bite out of this pie". If they thought about it they'd say two links, and if challenged with: ...
by CJ
17 Jun 2019, 11:56am
Forum: Bikes & Bits – Technical section
Topic: Simple guide to worn rear cassette
Replies: 38
Views: 2181

Re: Simple guide to worn rear cassette

https://i4.tfb.me/prodImgs/TFB10_CH1009.jpg links, half-links... bound to be confusion... :wink: Thanks for the understanding wink - and for providing a nice illustration of why to minimise confusion, we must stick to calling the element of chain connecting two pivots one whole LINK, never mind if ...
by CJ
12 Jun 2019, 11:06pm
Forum: Bikes & Bits – Technical section
Topic: Simple guide to worn rear cassette
Replies: 38
Views: 2181

Re: Simple guide to worn rear cassette

IIRC the rollers on any one inner half-link (IHL) don't quite stay the same distance apart when pushed in the same direction; the reason for this is that the half bushings which support the rollers also wear unevenly. The extent to which this occurs seems to vary with the chain and the usage condit...