Search found 2878 matches

by Samuel D
18 Oct 2019, 11:46am
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 3073

Re: Small wheel blowouts - options?

Now I was thinking that heat induced blowouts happened because the inner tube got too hot and the material failed. Is that not the case? Brandt certainly didn’t think so. Such a failure would hiss down relatively slowly (seconds) and not make the “loud bang” you heard. A loud, explosive noise is ev...
by Samuel D
18 Oct 2019, 11:10am
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 3073

Re: Small wheel blowouts - options?

The effect of brake efficiency on blowout risk is negligible within the reasonable range of brakes. Other things, especially rim weight, matter far more. Small rims are light and that is the main problem here. Blow-outs that lift the tyre over the rim are not caused by a rise in air pressure from te...
by Samuel D
18 Oct 2019, 10:17am
Forum: On the road
Topic: Found - Twenty Quid
Replies: 91
Views: 4159

Re: Found - Twenty Quid

Your daughter will remember that for a while, dav66. Which reminds me … A while ago I left a Billingham bag in a fast-food restaurant in Hungary with 400 euros of cash alongside essentially all of my possessions of any monetary value. Story here. The young restaurant manager rummaged around the cont...
by Samuel D
16 Oct 2019, 8:22pm
Forum: Bikes & Bits – Technical section
Topic: Shimano chainsets and chainrings
Replies: 15
Views: 899

Re: Shimano chainsets and chainrings

What are your sources for this in-depth minutiae on Shimano parts, thelawnet?

Finding reliable documentation on this sort of thing has proven nearly impossible the few times I’ve tried to research a particular component, never mind the whole range.

Good job.
by Samuel D
16 Oct 2019, 8:17pm
Forum: Bikes & Bits – Technical section
Topic: Which bike?
Replies: 24
Views: 890

Re: Which bike?

Ordinary lycra shorts and tops, aerodynamics a bit academic at the speeds I ride! Don’t be too sure about that! At 20 km/h, about half of your power is used to overcome aerodynamic drag. So reducing drag has a big effect on speed. You might be surprised how much a tight-fitting winter jacket reduce...
by Samuel D
16 Oct 2019, 1:03pm
Forum: Touring & Expedition
Topic: La Dolce Vita
Replies: 37
Views: 3359

Re: La Dolce Vita

On Eggleston, Michael Almereyda made a fascinating documentary called William Eggleston In The Real World, back in 2005. I ordered it on DVD from America, that being the only place I could find it. It was rereleased recently and might be easier to find now. Worth hunting down if anything nsew says o...
by Samuel D
15 Oct 2019, 7:59pm
Forum: Bikes & Bits – Technical section
Topic: Amusing video about Cervelo being shoddy
Replies: 31
Views: 2181

Re: Amusing video about Cervelo being shoddy

Meanwhile IRD now offering new build loose bearing BB, very nice quality. ird_bb_tenacity_loose2_900.jpg That’s beautiful. More photos here. I went looking a bit more and it seems to be made (or just branded too?) by Tange-Seiki. Not cheap, naturally. But it might last forever with high-viscosity b...
by Samuel D
15 Oct 2019, 9:39am
Forum: Bikes & Bits – Technical section
Topic: Amusing video about Cervelo being shoddy
Replies: 31
Views: 2181

Re: Amusing video about Cervelo being shoddy

Earlier this year a friend bought a Cervélo S3 Disc around the €6000 region. It creaked like a floorboard from the start. But creaking, ultra-expensive bicycles of many brands are common where I live. Whether the manufacturer hears about the problem depends on the rider. I am surprised at the noises...
by Samuel D
15 Oct 2019, 9:28am
Forum: Bikes & Bits – Technical section
Topic: Rim thickness - worn out?
Replies: 104
Views: 3524

Re: Rim thickness - worn out?

Interesting. If I recall correctly, Mavic specified 116 PSI as the max pressure for a 28 mm tyre on the last Mavic Open Pro C I bought (non-CD). So, especially if your tyre was 26 mm, you didn’t greatly exceed that. I would have expected a greater margin of safety.
by Samuel D
15 Oct 2019, 9:26am
Forum: Bikes & Bits – Technical section
Topic: Cassette question
Replies: 43
Views: 2204

Re: Cassette question

………. There is a saying ‘you can’t teach an old cog, new links’ which is very true, you’ll nearly always get some slipping, initially, when you don’t change cassettes and chains together, as the new pairing re mesh....... Wrong. It isn’t “wrong” I’m not arguing about it again. At the very least, “ne...
by Samuel D
15 Oct 2019, 9:16am
Forum: Bikes & Bits – Technical section
Topic: Rim thickness - worn out?
Replies: 104
Views: 3524

Re: Rim thickness - worn out?

I just had a Mavic Open SUP CD rim split on me, after over-pressuring (135 PSI) a new tyre in order get the bead to seat properly. What size tyre? Wider ones exert a greater spreading force on the rim lips for a given pressure. Mavic specifies different max pressures for different tyre sizes for th...
by Samuel D
11 Oct 2019, 2:53pm
Forum: Health and fitness
Topic: Broken shoulders!
Replies: 16
Views: 1161

Re: Broken shoulders!

Yeah, shoulder surgery is no joke. I broke my femur years ago but that was easy compared to this because it healed by itself (six weeks on crutches, no cast). This has been traumatic enough already, and at some point in the future (1–2 years) I’ll need another operation to remove the hardware follow...
by Samuel D
10 Oct 2019, 10:53pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 533

Re: Single source for rim ERDs?

This whole reassessment comes from my crash that will have torpedoed my fitness by the time I get back on the bicycle. Additionally, I want to take steps to reduce the risk of another bad crash over the next 18 months. I envisage more solo and gentle small-group riding and less big-group hammering w...
by Samuel D
10 Oct 2019, 10:26pm
Forum: Bikes & Bits – Technical section
Topic: The Disc Brake Naughty Corner Thread
Replies: 538
Views: 28078

Re: The Disc Brake Naughty Corner Thread

I know a few riders who can drop me on climbs but turn into donkeys on descents. It’s funny that I thought I was a strong climber (because I’m 65 kg) and weak descender (because I’m not reckless) until I rode with some amateur racers in the Paris region. On disc brakes I travel much faster downhill ...
by Samuel D
10 Oct 2019, 10:04pm
Forum: Bikes & Bits – Technical section
Topic: cassette lockring
Replies: 3
Views: 318

Re: cassette lockring

A rule of thumb is that the axial load on a threaded fastener is borne by the first three threads before it tapers off to negligible. So I’d want at least three turns on that principle. Are you certain you’ve fitted the final (smallest) sprocket the right way around? I’ve seen that mistake made befo...