Search found 12228 matches

by 531colin
16 Feb 2019, 4:39pm
Forum: Health and fitness
Topic: Scientists say high cadence is inefficient
Replies: 33
Views: 951

Re: Scientists say high cadence is inefficient

Here's a quote from Marcus' article...… "....In one case the cyclists pedaled their bikes at 50 revolutions per minute (rpm) while using a high gear. In the second case, the athletes pedaled in a low gear at 100 rpm. The athletes were travelling at identical speeds in the two instances, so thei...
by 531colin
16 Feb 2019, 4:04pm
Forum: Does anyone know … ?
Topic: Giant VS Specialized
Replies: 4
Views: 203

Re: Giant VS Specialized

I hired a Spec. Tarmac (56cm) in the Dolomites last year, (so obviously not the latest one.)
I found it a nice ride, well-mannered and nicely composed on Alpine type descents.
Over-geared for this old man, though.

I second Vorpal....go ride them!
by 531colin
16 Feb 2019, 3:57pm
Forum: Bikes & Bits – Technical section
Topic: Replace 27.5 rims with 700
Replies: 15
Views: 580

Re: Replace 27.5 rims with 700

I suspect Sputniks are cheap because that's the sort of money they can get for them....its an old-fashioned extrusion and they are a workaday sort of rim, and people don't usually pay silly money for practical cycle stuff. Deep-section rims for spangly bikes with more gears than spokes are another m...
by 531colin
15 Feb 2019, 5:48pm
Forum: Health and fitness
Topic: Scientists say high cadence is inefficient
Replies: 33
Views: 951

Re: Scientists say high cadence is inefficient

………. and high force high Cadence pedalling forces the muscles to feed mostly from fat, so a rider with a low body fat percentage can’t afford to do high force High cadence pedalling for very long, and that’s why the skinny pros do it the way they do it. No. The body stores fat as energy source. Eve...
by 531colin
15 Feb 2019, 5:26pm
Forum: Bikes & Bits – Technical section
Topic: Replace 27.5 rims with 700
Replies: 15
Views: 580

Re: Replace 27.5 rims with 700

I'm using a pair of these.... https://spacycles.co.uk/m2b0s116p3788/KINLIN-XD-230 They have a nice deep well, and I can get my 32mm Marathon Supremes (folding bead) both off and on without levers, even with arthritic thumbs. They are a stiff rim and mine were true, so dead easy to build up into true...
by 531colin
13 Feb 2019, 3:57pm
Forum: Does anyone know … ?
Topic: Positioning A Shorter Nose Saddle
Replies: 4
Views: 407

Re: Positioning A Shorter Nose Saddle

........You want your sit bones to be in the same place,...... ^^^^^^THIS! Unfortunately, you won't know exactly where your bum bones go on the new saddle until you have ridden it for long enough to make a dent. Drop a plumb line through the BB axle, and measure from the middle of the bum bone dent...
by 531colin
12 Feb 2019, 11:04pm
Forum: Health and fitness
Topic: Medical opinions?
Replies: 12
Views: 456

Re: Medical opinions?

gbnz wrote:......….The problem now is that the &^%$£^& have driven me out of employment, .......

How, exactly, have they driven you out of employment?
by 531colin
10 Feb 2019, 6:33pm
Forum: Bikes & Bits – Technical section
Topic: Galaxy Steel Frame repair advice please
Replies: 31
Views: 2378

Re: Galaxy Steel Frame repair advice please

What strikes me about this is how little metal there is in the bit of the seatstay which has failed. Just sticking it on the seat lug a bit higher up would give a bigger cross section of metal. I think I've seen Brucey's "splice and cap" called a "top plate" to differentiate from...
by 531colin
10 Feb 2019, 6:11pm
Forum: Bikes & Bits – Technical section
Topic: crossed spoking vs radial, rear wheel for rim brake
Replies: 4
Views: 780

Re: crossed spoking vs radial, rear wheel for rim brake

Making one set of spokes radial is a great way of making it look like somebody thought about it, and it costs the manufacturer nothing. However, this falls over when a customer notices that 2 people "thought about it" and came up with different answers. A rim brake rear wheel has no brake ...
by 531colin
31 Jan 2019, 10:03am
Forum: Bikes & Bits – Technical section
Topic: Seat tube front derailleur over tightened
Replies: 17
Views: 1588

Re: Seat tube front derailleur over tightened

I'm sure we would all prefer undented tubes, but there are lots of bikes in use with bigger dents than that. In fact, that bike probably has bigger dents in the chainstays. Are they in some way "different"? Both are made cold, I assume? Agreed that if a seat tube is going to fail, it will ...
by 531colin
31 Jan 2019, 9:51am
Forum: Bikes & Bits – Technical section
Topic: Wheel sizes vs Handling
Replies: 54
Views: 2692

Re: Wheel sizes vs Handling

Mick F wrote:………., and trail wouldn't affect much at that speed.

Why?
My experience is the opposite, once you have got a bit of speed on, most bikes feel pretty stable, at least until you start playing about or pushing the envelope. Its at the low speeds that I feel wheel flop or twitchyness.
by 531colin
31 Jan 2019, 9:44am
Forum: Does anyone know … ?
Topic: Any good tips to improve pedal action
Replies: 16
Views: 2096

Re: Any good tips to improve pedal action

I think there is a difference between getting cold in extreme weather (like now) and getting cold any time the temperature is in single figures. However, if your socks are damp with sweat, I think you have found the problem. I have old Shimano MTB boots, which are great for keeping my feet warm. The...
by 531colin
30 Jan 2019, 6:44pm
Forum: Bikes & Bits – Technical section
Topic: Wheel sizes vs Handling
Replies: 54
Views: 2692

Re: Wheel sizes vs Handling

Mick F wrote:…...
Mercian 46mm trail. ......
Marjorie 65mm trail. ......

So it looks like trail might affect handling. And after only 4 pages.
by 531colin
30 Jan 2019, 6:41pm
Forum: Bikes & Bits – Technical section
Topic: Source of Soft steel 'screwdriver-like' tool for R Musson Nipple-driver tool
Replies: 19
Views: 1451

Re: Source of Soft steel 'screwdriver-like' tool for R Musson Nipple-driver tool

If you build lots of (conventional) wheels then Park Tool's cranked nipple driver is useful and saves a bit of time. If you don't build many wheels it will probably take you more time to make a nipple driver than the time you might save using it. On a similar note, long ago I developed a "nippl...
by 531colin
30 Jan 2019, 6:23pm
Forum: Bikes & Bits – Technical section
Topic: Seat tube front derailleur over tightened
Replies: 17
Views: 1588

Re: Seat tube front derailleur over tightened

I think that's rather small compared to (say) the dents in the chainstays to clear the tyre/chainring.