Search found 35572 matches

by Brucey
23 Oct 2019, 12:17pm
Forum: Bikes & Bits – Technical section
Topic: What LED lights for AXA HR Traction bottle dynamo?
Replies: 3
Views: 66

Re: What LED lights for AXA HR Traction bottle dynamo?

if you want a brighter light, get the 80 lux version. Worst case is that it will a) have a switch in that it doesn't really need and/or b) it may not reach full brightness depending on how close to 3W the generator makes It will make as much or more light per watt that the generator produces. FWIW I...
by Brucey
23 Oct 2019, 12:05pm
Forum: Bikes & Bits – Technical section
Topic: Hand built wheels.
Replies: 14
Views: 473

Re: Hand built wheels.

as others have pointed out if you are buying wheels from a good wheelbuilder, be guided by his recommendation; you certainly won't get the best out of him by asking him to build wheels that use parts that he wouldn't choose. FWIW if you are going to use the wheels for racing only (limited mileage, g...
by Brucey
23 Oct 2019, 11:42am
Forum: Does anyone know … ?
Topic: Tall person seeks fast, reliable commuting bicycle
Replies: 6
Views: 140

Re: Tall person seeks fast, reliable commuting bicycle

re hub gears; you can gear those up to give an absurd top gear if you like, often more easily than with derailleurs. For example you can start with 53/13 and then top gear in a 3s hub is x4/3 that. Note that not all IGHs accept such a small sprocket. But...you will have fewer gear ratios than with a...
by Brucey
22 Oct 2019, 7:30pm
Forum: Bikes & Bits – Technical section
Topic: Chainline considerations when using triple chainset as double
Replies: 6
Views: 216

Re: Chainline considerations when using triple chainset as double

depends on how long the triple BB is to start with. The 'correct' chainset position is about 4mm different between a double and a triple (chainrings are usually on ~8mm centres), but the perfect chainline varies depending what width/speed the rear hub is, and whether you have an offroad framset or n...
by Brucey
22 Oct 2019, 6:31pm
Forum: Bikes & Bits – Technical section
Topic: Removing rust from an old steel frame
Replies: 4
Views: 307

Re: Removing rust from an old steel frame

aluminium foil is a bodger's delight; it scrapes loose rust from chromed parts and what it doesn't remove it turns silver-coloured for at least five minutes. It is not the method that is to be used on a 531 frame. Realistically you can't tell if thin-walled frame tubes are corroded to the point of f...
by Brucey
22 Oct 2019, 10:14am
Forum: Bikes & Bits – Technical section
Topic: Would you ride on this fork?
Replies: 12
Views: 666

Re: Would you ride on this fork?

IIRC in the other thread the amounts by which the wheel moves laterally (under load) are well described. The deflections reported are far more than normal and (apparently) have increased since the fork was new. Other comparable forks don't deflect the same amount with the same wheels installed. Any ...
by Brucey
22 Oct 2019, 10:05am
Forum: Does anyone know … ?
Topic: Bikes and air pockets (General not technical)
Replies: 13
Views: 737

Re: Bikes and air pockets (General not technical)

I have often wondered if the turbulant area behind a vehicle traveling at a constant speed is confirming to a regular/mathematic/random law whereby it's motion can be predicted or projected? ………. an air flow that curls around the top of the vehicle and could give that push if you rode in exactly th...
by Brucey
21 Oct 2019, 11:12pm
Forum: Bikes & Bits – Technical section
Topic: Big jockey wheels - good or bad?
Replies: 12
Views: 556

Re: Big jockey wheels - good or bad?

jb wrote:The man in the white suit film was flawed because simply having a material that would last forever would not have unduly affected output as people don't want the same thing forever....


That is far more true now than it was then, I feel.

cheers
by Brucey
21 Oct 2019, 7:40pm
Forum: Bikes & Bits – Technical section
Topic: Big jockey wheels - good or bad?
Replies: 12
Views: 556

Re: Big jockey wheels - good or bad?

going back a looong way, some versions of the shimano 'crane' RD were fitted with 9T pulleys. They were made from solid steel, and (provided they were lubed) were practically indestructible. cheers I do like the sound of those. Why did they disappear? Shades of the Man in the White Suit? http://www...
by Brucey
21 Oct 2019, 6:46pm
Forum: Bikes & Bits – Technical section
Topic: Big jockey wheels - good or bad?
Replies: 12
Views: 556

Re: Big jockey wheels - good or bad?

going back a looong way, some versions of the shimano 'crane' RD were fitted with 9T pulleys. They were made from solid steel, and (provided they were lubed) were practically indestructible.

cheers
by Brucey
21 Oct 2019, 6:37pm
Forum: Does anyone know … ?
Topic: Bikes and air pockets (General not technical)
Replies: 13
Views: 737

Re: Bikes and air pockets (General not technical)

with enough thrust behind it, at the appropriate angle of attack, a housebrick would generate lift...

cheers
by Brucey
21 Oct 2019, 6:18pm
Forum: Bikes & Bits – Technical section
Topic: Big jockey wheels - good or bad?
Replies: 12
Views: 556

Re: Big jockey wheels - good or bad?

By the by (if my mech survives long enough to merit replacement jockeys) are all shimano "big" wheels effectively the same/compatible? they vary in size, so you need to get ones that are close-ish else there may be problems. They also vary in quality. Good points - they are more efficient...
by Brucey
21 Oct 2019, 5:06pm
Forum: Bikes & Bits – Technical section
Topic: Mudguards - a minefield
Replies: 18
Views: 683

Re: Mudguards - a minefield

the bike probably deserves as special prize for 'least easy to fit mudguards to' https://static.evanscycles.com/production/bikes/mountain-bikes/product-image/969-638/specialized-rockhopper-sport-29-2018-mountain-bike-green-black-EV306339-6085-3.jpg I don't think there is a single conventional mounti...
by Brucey
21 Oct 2019, 2:20pm
Forum: Bikes & Bits – Technical section
Topic: Mudguards - a minefield
Replies: 18
Views: 683

Re: Mudguards - a minefield

suggestion; take a look at how mudguards are attached to similar bikes parked in shops or in bike racks. Then take a look at mudguards and maybe some online fitting instructions for them. You may need to buy special brackets to make them fit on some bikes (eg if you have a suspension fork; brackets ...
by Brucey
21 Oct 2019, 10:35am
Forum: Bikes & Bits – Technical section
Topic: Shimano upgrade gears only - which bits?
Replies: 12
Views: 362

Re: Shimano upgrade gears only - which bits?

Sora R3000 is 9s; what exact cassette do you have fitted? It might be that you just need a different cassette on it which has ratios that you are more likely to use. 9s consumables (cassette and chain) are usually quite a bit less expensive than 11s ones, and might be expected to last a bit longer. ...