Search found 2850 matches

by Samuel D
10 Oct 2019, 10:26pm
Forum: Bikes & Bits – Technical section
Topic: The Disc Brake Naughty Corner Thread
Replies: 538
Views: 26653

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: 305

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...
by Samuel D
10 Oct 2019, 9:57pm
Forum: Bikes & Bits – Technical section
Topic: Routing the rear mech cable
Replies: 6
Views: 388

Re: Routing the rear mech cable

Friction with a new cable is proportional to the total angle through which the cable bends.

However, cables will wear a groove into the lined insides of housings faster on sharper bends and perhaps disproportionately increase friction there as they wear. Imagine a vee-belt in a pulley.
by Samuel D
10 Oct 2019, 9:44pm
Forum: Bikes & Bits – Technical section
Topic: Rim thickness - worn out?
Replies: 100
Views: 2396

Re: Rim thickness - worn out?

They’ll all wear the rim if you brake in the wet. Can’t you avoid that, Mick? Play Scrabble on rainy days. Or refrain from braking in the wet. If you ride on dry days your rims (and pads) will last near enough forever. Essentially all wear seems to happen in the wet. I knocked over a millimetre off ...
by Samuel D
10 Oct 2019, 9:24pm
Forum: Health and fitness
Topic: Broken shoulders!
Replies: 17
Views: 832

Re: Broken shoulders!

I’m a long way behind you, unfortunately. But the check-up on 2 October went okay and progress is happening, so I’m happier than I was before. I still have the sling about half the day and at night. I can lift my arm about halfway, depending on the direction. It feels like a hard stop, but previousl...
by Samuel D
10 Oct 2019, 9:06pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 505

Re: Single source for rim ERDs?

One option might be to delay building a new wheel with the regular hub, and try a good quality 32mm tyre on your dynamo wheel and rear wheel, and then decide what to do based on trying the 32mm tyre on your current narrow rims Yes, not a bad idea. I’m attracted to 35 mm since that’s the frame’s lim...
by Samuel D
10 Oct 2019, 5:22pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 505

Re: Single source for rim ERDs?

I'd use different lengths for Open Pro C and Open Elite, so its not entirely clear to me what ERD you really want. I’ve got spokes of both lengths, at least for the front wheel. The spokes in my recently crashed wheel were first in an Exal XR2 wheel built by Spa Cycles that I re-rimmed with a Mavic...
by Samuel D
10 Oct 2019, 4:16pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 505

Re: Single source for rim ERDs?

If you have the rim in a wheel you could measure it by peeling the rim tape back just one spoke hole and measuring the drop from the outer diameter of the rim to the top of the nipple, for example with the depth probe of a Vernier calliper from a ruler held flat across the rim walls as a bridge (the...
by Samuel D
10 Oct 2019, 2:59pm
Forum: Bikes & Bits – Technical section
Topic: Single source for rim ERDs?
Replies: 14
Views: 505

Single source for rim ERDs?

I’m thinking of building up a pair of wheels with wider rims to fit tyres up to 35 mm, preferably with my existing spokes as used for Mavic Open Elite and Open Pro C rims. How would I go about finding my options? I realise ERD varies a little with manufacturing and silent design variations, but it w...
by Samuel D
9 Oct 2019, 11:24am
Forum: On the road
Topic: Found - Twenty Quid
Replies: 62
Views: 1786

Re: Found - Twenty Quid

Reminds me of the extraordinary story of Dan Cooper and his unspendable $200,000.
by Samuel D
9 Oct 2019, 10:20am
Forum: Bikes & Bits – Technical section
Topic: Gear changing strategy; how do you use a triple?
Replies: 61
Views: 1645

Re: Gear changing strategy; how do you use a triple?

One form of SSR I recall from using a triple on a mountain bike is shifting to the outer chainring and cross-chaining as much as necessary before a bumpy descent, the better to retain the chain and prevent chain slap. I think freedom from this sort of mental overhead is a major driving force behind ...
by Samuel D
9 Oct 2019, 9:59am
Forum: Bikes & Bits – Technical section
Topic: Cassette question
Replies: 28
Views: 1091

Re: Cassette question

The reason most chain wear indicators are not as useful as they should be is described here. Essentially they measure the wrong thing. For this reason I prefer a ruler.
by Samuel D
9 Oct 2019, 9:48am
Forum: On the road
Topic: Found - Twenty Quid
Replies: 62
Views: 1786

Re: Found - Twenty Quid

I've found a wallet with cards and £50 - phoned up the guy, he collected and gave me a fiver (which I'll be honest I thought was a bit tight but the real reward is in returning it). So what reward would have made you happier in this case? A while ago I left a Billingham bag in a fast-food restauran...
by Samuel D
8 Oct 2019, 9:00am
Forum: Bikes & Bits – Technical section
Topic: Broken Spoke
Replies: 12
Views: 627

Re: Broken Spoke

As you screw the nipple and the slack goes out of the new spoke, pluck it with a thumbnail near the nipple. It will ring like a guitar string: the greater the tension, the higher the tone. Do the same to adjacent spokes on the same side of the wheel. That will give you a reference point to get the t...
by Samuel D
7 Oct 2019, 12:02pm
Forum: Bikes & Bits – Technical section
Topic: Broken Spoke
Replies: 12
Views: 627

Re: Broken Spoke

You haven’t. The measurement is from the inside of the elbow. Take care because it must be accurate to within a millimetre or so. That the spoke broke there is typical of wheels that haven’t been stress-relieved. By stress relief is meant controlled overloading of spokes (by simultaneously squeezing...