1,334 reputation
514
bio website chiark.greenend.org.uk/~armb
location Cambridge, UK
age 49
visits member for 3 years, 1 month
seen Apr 18 at 12:04

Oct
4
comment How to remove a crank arm with stripped threads?
Or until the plastic shims crumple and break. @mikes tie rod remover is more effective. Does depend just how stuck the crank is of course.
Oct
4
comment How to remove a crank arm with stripped threads?
"Heavy duty tuning fork" type: amazon.co.uk/Draper-14159-Ball-Joint-Separator/dp/B0001K9Q2C Usable as "cotter press" type: toolbox.co.uk/draper-13914-19mm-capacity-14632-63529
Oct
4
comment How to remove a crank arm with stripped threads?
I have resorted to that sort ball joint splitter. With some cranksets it might be possible to to it without damaging the chainrings (if they are removable chainrings worth keeping, take them off), but in my case it wasn't. (Incidentally, another sort of ball joint splitter makes a usable cotter press. Not many people have cottered cranks these days though.)
Oct
4
comment How tight should a threaded BB be?
Bottom bracket designed for 73mm shell, frame with 68mm shell? Otherwise, what Daniel said. (I've only seen locknuts on cup and cone BBs, not on cartridge ones, but I haven't got an Octalink.)
Oct
4
comment Treacherous ride - top half of fork points backwards, but the bottom points forward
Are you sure the fork hasn't just been bent backwards in a crash? (The curve of the fork crown looks as if it would be wrong if you turned it round. But then I'd expect there to be some visible damage at the top if it was bent back, and I can't see any, so maybe it really is an assembly problem.)
Oct
4
comment What are the standard shifter designs and mechanisms?
Are you asking about the mechanics of how the gear changing works? Or just what different styles of shifter are available? If there former, there are two basic mechanisms, either the cable moves a derailleur (front or rear) that physically moves a chain from one sprocket to another, or (simplifying a bit) it changes which gears are engaged inside an epicyclic (mostly hub gears). There are also a very few non-electronic hub gears that change without cables, either by back-pedalling (duomatic) or mechanical speed dependent (e.g SRAM Automatix). Also the Schlumpf bottom bracket has a heel lever.
Oct
1
comment Trading out folding bike seat post
Here's a replacement/aftermarket "third wheel". I don't know whether it will fit your older size seatpost though handsonbike.blogspot.sg/2012/07/…
Sep
27
comment How to compensate broken thread in brake barrel adjuster?
Or if necessary buy one from a different manufacturer, e.g. chainreactioncycles.com/shimano-rear-mech-barrel-adjuster/… But it's possible his brake has a non standard part.
Sep
27
comment How to compensate broken thread in brake barrel adjuster?
Another one - rosebikes.co.uk/article/shimano-shift-cable-adjuster-sm-ca70/…
Sep
27
comment How to compensate broken thread in brake barrel adjuster?
Alternatively, drill from the other side and if it grabs it will screw the adjuster back out the side it would normally come.
Sep
26
comment What size are the screws used for water bottle mounts etc?
@chris mackay.co.uk But since you're right about not finding the fine thread ones on a bike, it doesn't really matter that most hardware stores won't stock them :-)
Sep
26
comment What size are the screws used for water bottle mounts etc?
My local hardware store almost certainly does have fine thread screws too. But they won't be in the same drawer as the normal coarse thread screws. And surely the point of the question is that if you know what size you want, you don't need to take a sample.
Sep
26
comment What size are the screws used for water bottle mounts etc?
en.wikipedia.org/wiki/ISO_metric_screw_thread#Designation 'If the pitch is the normally used "coarse" pitch listed in ISO 261 or ISO 262, it can be omitted' (As Chris H said, basically.)
Sep
26
comment What size are the screws used for water bottle mounts etc?
For "used all over modern bikes", they will be standard metric threads, so just "M5" is enough. If it's an older bike, you have to worry that 2BA is close enough to M5 that you can't tell them apart at a glance.
Sep
26
comment Yet another stuck BB. Help me save my frame!
I'd cut it with a Stanley knife rather than use a Dremel. Slow, but less risk of damaging the threads.
Sep
26
comment Do I need to face my new frame?
Have you asked the manufacturer what they recommend? Threaded bottom bracket, almost certainly not, headset, quite likely not, even if they have been painted over: bicycles.stackexchange.com/questions/7753/… (Just a comment, because that doesn't actually answer the "how can I tell" question.)
Sep
24
comment Will this Retrospec Siddhartha bike suit my needs?
That's a single-speed bike, not a fixie. There are people who happily commute commute miles over hills on fixed gear or single speed bikes, but I wouldn't recommend it as a first bike. With a £200 budget, I'd look for second hand bikes, ideally from a local store where you can ask for advice, or eBay or Gumtree etc..
Sep
17
comment How do I deal with a dog chasing me when I'm touring?
I do have a frame pump peg on my (fairly old) road bike, but I also have a locking clip so I can leave the pump on the frame when the bike is parked, so I still can't grab the pump when riding. And my current pump has a plastic body which wouldn't take the weight of a large dog anyway.
Sep
17
comment Can I put drop handlebars on my commuter bike?
You can also get "drop bar bar ends": sjscycles.co.uk/… I'd be very cautious about keeping straight bar brake levers on them though.
Sep
17
answered drum brakes and drop handle bars