Search found 2878 matches

by Samuel D
15 Nov 2019, 11:58am
Forum: Bikes & Bits – Technical section
Topic: Only 5Nm on a stem/handlebar clamp?
Replies: 57
Views: 1519

Re: Only 5Nm on a stem/handlebar clamp?

You end up with a force of 5Nm spread equally across the plate […] You’re using torque units to describe force, like Manc33 did earlier. If the clamp is the same size, there’s about twice the clamping force if it has four screws rather than two at the same torque. Of course there are a few gotchas ...
by Samuel D
15 Nov 2019, 11:01am
Forum: Bikes & Bits – Technical section
Topic: Only 5Nm on a stem/handlebar clamp?
Replies: 57
Views: 1519

Re: Only 5Nm on a stem/handlebar clamp?

Darkman wrote:(assuming there are 4 [screws], one of our bikes only has 2).

Which in itself renders the concept of a torque value printed on the handlebar a bit daft, doesn’t it.
by Samuel D
14 Nov 2019, 11:13pm
Forum: Bikes & Bits – Technical section
Topic: Only 5Nm on a stem/handlebar clamp?
Replies: 57
Views: 1519

Re: Only 5Nm on a stem/handlebar clamp?

I recall trying to explain this a while ago. Where did this persistent notion of torque as clamping force come from, Manc33? As for the Chinese bar with the 5 Nm symbol, the number was probably pulled out of thin air or copied from a brand name’s installation instructions. Still, it’s probably about...
by Samuel D
11 Nov 2019, 10:11pm
Forum: Bikes & Bits – Technical section
Topic: Shaft drive..why? why not?
Replies: 14
Views: 647

Re: Shaft drive..why? why not?

I’ve ridden a shaft-drive bicycle, possibly even one of those Arcades (Arcade is a French brand). It felt not only draggy but springy. Removing the springiness would likely come with an intolerable weight penalty.

There’s a lot to be said for chains on sprockets.
by Samuel D
11 Nov 2019, 7:28pm
Forum: The Tea Shop
Topic: Car battery charging from deep discharge
Replies: 18
Views: 603

Re: Car battery charging from deep discharge

Thanks for the answers, all. It’s a shame they’re not all the same, but they give me a clearer idea of what’s possible. The car lives a couple of floors underground with no real light. There’s no mains power but I don’t think we need it. We typically use it every couple of weeks for a decent drive (...
by Samuel D
10 Nov 2019, 7:26pm
Forum: Bikes & Bits – Technical section
Topic: Longest burn time lights.
Replies: 49
Views: 2068

Re: Longest burn time lights.

mjr wrote:Rear light failures seem less common now that LED lights are widespread.

Yes, but, at least here in Paris, too often they’re not on because the car has daytime running lamps and the driver is too ditzy to turn on the night lamps. Shows how often they look at the speedometer!
by Samuel D
10 Nov 2019, 7:23pm
Forum: The Tea Shop
Topic: Car battery charging from deep discharge
Replies: 18
Views: 603

Re: Car battery charging from deep discharge

From past experience I'd say get a new battery. yes likely one or more cells have had it. In the long run best get a new battery. You might be able to revive it temporarily but it then let you down some where out in the sticks ( has happened to me). lead acid batterys dont like being run down. Will...
by Samuel D
10 Nov 2019, 7:22pm
Forum: The Tea Shop
Topic: Car battery charging from deep discharge
Replies: 18
Views: 603

Re: Car battery charging from deep discharge

Unless there is actually another problem, like the battery is near the end of its life, or the alternator was failing to charge it properly before this incident, or current is "leaking away" when the car is stopped not just because of the interior light being left on....... No other probl...
by Samuel D
10 Nov 2019, 6:24pm
Forum: The Tea Shop
Topic: Car battery charging from deep discharge
Replies: 18
Views: 603

Car battery charging from deep discharge

Sorry to bring cars into this fine cycling forum, but I don’t know anyone else to ask. My girlfriend left the interior lamp on in our car while it was parked … for about two weeks. A few attempts at bump-starting didn’t work, perhaps because I couldn’t get enough momentum in the space available in t...
by Samuel D
10 Nov 2019, 2:56pm
Forum: Bikes & Bits – Technical section
Topic: Wheel building - my foray into the science and the art
Replies: 19
Views: 751

Re: Wheel building - my foray into the science and the art

If I get my spoke tensioner out on my built wheels, what should I use it to do? Which came first: the true wheel, or the one with near-even spoke tensions? The best compromise between a true wheel and one with even spoke tensions is a matter of judgement. Experience helps but knowledge and understa...
by Samuel D
3 Nov 2019, 3:10pm
Forum: Bikes & Bits – Technical section
Topic: Derailleur Hanger alignment tool ?
Replies: 70
Views: 2862

Re: Derailleur Hanger alignment tool ?

I don't like the faffing around with the tru-axles, extensions, and all that. Seems overkill unless your goal is compatibility with all types of frames. I haven’t paid attention to through-axles since I don’t have a frame that needs them. Through-axles add fuss to a lot of things we take for grante...
by Samuel D
3 Nov 2019, 12:12pm
Forum: Bikes & Bits – Technical section
Topic: Derailleur Hanger alignment tool ?
Replies: 70
Views: 2862

Re: Derailleur Hanger alignment tool ?

I’m not interested in the portable aspect of it, although I do like the small size for storage (I live in a small flat). But the design is nice because it allows quick, easy, and accurate alignment. That’s not a bad trick. And clutter on the bicycle (e.g. mudguards, rack stays, etc.) doesn’t get in ...
by Samuel D
1 Nov 2019, 11:14am
Forum: Bikes & Bits – Technical section
Topic: Derailleur Hanger alignment tool ?
Replies: 70
Views: 2862

Re: Derailleur Hanger alignment tool ?

I like the look of the new Wolf Tooth hanger alignment tool. So does Jim Langley, who shows how it works from about 5:00 in this video. This design should be much easier and quicker to use than the Park Tool type although it won’t so easily allow you to adjust toe and camber to a non-zero value if y...
by Samuel D
18 Oct 2019, 3:48pm
Forum: Bikes & Bits – Technical section
Topic: Small wheel blowouts - options?
Replies: 98
Views: 3073

Re: Small wheel blowouts - options?

Mine never went BANG! or came off the rim on either occasion. They went "ssssssssssssss tut" within about ten feet and then the tyre was totally flat. No damage to the tyre, just a wrecked tube and a blisteringly hot rim. Where was the hole relative to tyre and rim features, and what did ...
by Samuel D
18 Oct 2019, 11:53am
Forum: On the road
Topic: Found - Twenty Quid
Replies: 91
Views: 4159

Re: Found - Twenty Quid

Reminds me of the extraordinary story of Dan Cooper and his unspendable $200,000. That's a great story! But I couldn't see the reason that the cash was "unspendable" :/ Every bill’s serial number was recorded and made public, so spending any of it would reveal, or seriously risk revealing...