1,393 reputation
514
bio website chiark.greenend.org.uk/~armb
location Cambridge, UK
age 50
visits member for 3 years, 7 months
seen Oct 15 at 15:30

Sep
10
comment New Trek 1.5 wheels need to be trued after 2 rides, normal?
Cheap truing stands - billys.co.uk/english/… bikehacks.com/bikehacks/2012/06/… instructables.com/id/… Much more expensive than Park ($1,850) but very nice - pklie.de/truing_stand.html wheelfanatyk.com/blog/a-perfect-truing-stand
Jul
30
comment Is there a way to hop up onto a parallel curb?
Drivers deliberately using their vehicles to assault cyclists is a thing that happens. surrey.police.uk/news/witness-appeals/all-witness-appeals/… It's unusual, and it's unlikely that being able to hop sideways onto a curb will help you, but if a driver is already breaking the law by driving in a bike lane, "giving way" to them may be the safest option.
Jul
21
comment How can I tell if I have properly patched a tube? (specifically a 2" mt. bike tube)
Though a road tyre that still has a slow leak at 100psi won't necessarily show up overnight if you only inflate it that far, it should be fine for a 2" tyre.
Jul
19
comment Can I use cartridge bearings on my wheel hub?
Look at it another way - you say when you put new balls in, they look tighter. If it was really the cup that was worn making the balls look looser than when you first put them in, new balls would still look just as loose.
Jul
19
comment Can I use cartridge bearings on my wheel hub?
Seriously no - and nor have you. Think about it. It's not physically possible. Ball bearings are made to precisions of thousandths of an inch. Stretching by 1/8 of an inch to fit an extra half 1/4 ball in would wreck it. And if the cup really wore that much, it would do it every time you changed balls. A few services later, you wouldn't have space for half a extra ball, you would have space for two or three. But that doesn't happen. In reality, cones wear more than cups, they don't wear that much, and they do get pitted.
Jul
19
comment Can I use cartridge bearings on my wheel hub?
No, bearings just don't behave like that. Your experience may involve destroying hubs every thousand miles or so, but you can't wear a cup that much without having destroyed it.
Jul
18
comment Can I use cartridge bearings on my wheel hub?
Though if you count the ones that are there now and get a different answer left and right, that's a pretty good sign at least one of them is wrong :-)
Jul
18
comment Can I use cartridge bearings on my wheel hub?
If you find individual balls too fiddly, you can used caged ones. They won't roll quite as well though. e.g. amazon.co.uk/Weldtite-Caged-Precision-Wheel-Bearings/dp/…
Jul
18
comment Can I use cartridge bearings on my wheel hub?
Even if you have spare clean unworn balls, you should use ones bought together as a set except in an emergency. sheldonbrown.com/tooltips/hubs.html
Jul
18
comment Can I use cartridge bearings on my wheel hub?
"very quickly wear of the cup makes it look as if a ball is missing" - sorry, but that's just rubbish. Well maintained cups take years to wear, and the amount of wear that makes a bearing unusable is far less that the amount that would let you fit half an extra ball in. It's just that when you put the balls in and grease holds them into position, they aren't always pushed fully into the position they finally take up when you do the cones up. ("One less than you could squeeze in" is right though. e.g. madegood.org/bikes/repair/service-a-cup-and-cone-front-hub step 7)
Jul
18
comment Why are both Schrader and Presta valves still used on tubes?
The ones with a little bit of rubber are Woods valves, aka Dunlop valves. These days their main purpose is answering trivia questions about why some tyre repair kits still have little bits of rubber tubing. sheldonbrown.com/gloss_w.html#woods
Jul
3
comment Interrupter (cross) brake lever cable guide wedges?
Park recommend against wrapping over the cables all the way up to the lever - parktool.com/blog/repair-help/in-line-brake-levers-cross-levers "Wrap handlebars. However, do not attempt to bring bar tape to lever as this may stress housing (Figure 8)." (Making up a suitable wedge would avoid the risk of stressing the housing though. Now I'm tempted to make something for mine.)
Jul
3
comment MTB with Road crank
You can get 46t and 48t Deore chainrings. Keeping the same crank and using larger chainrings might be better and/or easier than using a road crank.
Jul
3
comment MTB with Road crank
It'll depend on your frame. The problem isn't whether the bracket will fit, it's whether larger chainrings will hit your chainstay, especially when changing from a triple to a double moves them closer in.
Jun
11
answered Riding a bike on a tilted road
May
19
comment Is it ok to mix 23 and 25 tyres
(Or, pedantically, tread pattern is useless, since slicks still have tread - en.wikipedia.org/wiki/Tread. e.g. legislation.gov.uk/uksi/1986/1078/regulation/27/made refers to "grooves of the tread pattern" but gov.uk/vehicle-maintenance-safety-security just uses "tread".
May
19
comment Is it ok to mix 23 and 25 tyres
While tread is generally useless on a road bike tyre, different tyres do use different rubber compounds with different coefficients of friction. Grip is more important on a front wheel, but most punctures are rear wheel, so while running narrower rear wheel is unusual, it's possible the tyres he happens to have make it the right choice.
May
10
comment What's a safer alternative to a flag for marking special bikes?
I was just thinking that buying something like that just for the Reach Ride was out of the question, but might be feasible if it could be reused. Maybe it could be used as inspiration for a DIY version though. I must have a look in my shed....
May
10
comment What's a safer alternative to a flag for marking special bikes?
@Mσᶎ - I was thinking of the way Bob's tailfin is designed to work as a sail in a crosswind, rather than being entirely free to pivot. paulworden.freeservers.com/Safety%20Sail.htm is a design inspired by it, but again I'd be dubious about it as a temporary attachment on a bike. A simpler rigid flag that swung round enough to not act as a sail could well work though.
May
9
answered What's a safer alternative to a flag for marking special bikes?