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Search: Posts Made By: Airburst
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
01-25-15, 05:36 PM
Replies: 15
Views: 2,923
Posted By Airburst

At the end of the day if you've bent the rim...

At the end of the day if you've bent the rim itself, the only way to get it true is to unbalance the spoke tensions. Assuming the rim was perfectly straight and round beforehand, all the spoke...
Forum: Bicycle Mechanics
01-23-15, 07:19 AM
Replies: 44
Views: 4,438
Posted By Airburst

I'd add my vote to these as well - setting up...

I'd add my vote to these as well - setting up triples with indexed shifting is a complete PITA, and front friction shifting would allow you to completely eliminate that.
Forum: Bicycle Mechanics
01-15-15, 02:49 PM
Replies: 21
Views: 5,068
Posted By Airburst

Not to put too fine a point on it, was there...

Not to put too fine a point on it, was there really any reason for saying that other than to feel smarter than the OP? The purpose of this forum is to help other people learn, after all.
Forum: Bicycle Mechanics
01-14-15, 11:54 AM
Replies: 6
Views: 1,046
Posted By Airburst

I'll offer a word of caution, OP. If you want to...

I'll offer a word of caution, OP. If you want to learn to fix bikes, asking people how to do each individual task you want to do by rote is not the way to go about it. You need to understand *why*...
Forum: Bicycle Mechanics
01-14-15, 11:50 AM
Replies: 160
Views: 21,317
Posted By Airburst

The strength of the matrix (the epoxy) is...

The strength of the matrix (the epoxy) is definitely important for the strength of the carbon composite, as dabac has said. I'm an engineering undergraduate student, and if you really want me to go...
Forum: Bicycle Mechanics
01-14-15, 09:26 AM
Replies: 6
Views: 1,046
Posted By Airburst

Or look at www.sheldonbrown.com...

Or look at www.sheldonbrown.com (http://www.sheldonbrown.com), and read his articles on working on bikes.
Forum: Bicycle Mechanics
01-14-15, 09:25 AM
Replies: 160
Views: 21,317
Posted By Airburst

No, you aren't getting it. The carbon may still...

No, you aren't getting it. The carbon may still be intact, but as ragtoplvr has said, in order to get the epoxy hot enough to allow it to deform like it has, you have taken it above the temperature...
Forum: Bicycle Mechanics
01-14-15, 09:18 AM
Replies: 23
Views: 2,357
Posted By Airburst

There's a table of all the BB threadings on...

There's a table of all the BB threadings on Sheldon Brown's website, but to summarise British and Raleigh fixed ups are left-hand threaded, Italian shells are right-hand, but then there are French...
Forum: Bicycle Mechanics
01-14-15, 05:15 AM
Replies: 160
Views: 21,317
Posted By Airburst

And just when I was starting to think I'd seen...

And just when I was starting to think I'd seen everything....
Forum: Bicycle Mechanics
01-14-15, 04:53 AM
Replies: 23
Views: 2,357
Posted By Airburst

I reckon the thin flats on the fixed cup of a...

I reckon the thin flats on the fixed cup of a cup-and-cone BB would probably either fail or take a chunk out of the vice jaws before the frame failed, but if you managed to get a Shimano or similar...
Forum: Bicycle Mechanics
01-13-15, 04:08 PM
Replies: 21
Views: 5,068
Posted By Airburst

FYI that isn't just a lockring, that is also the...

FYI that isn't just a lockring, that is also the right-hand bearing cone for the bottom bracket, which in your case has flats for a spanner* but in most of the cases I've seen has notches for a hook...
Forum: Bicycle Mechanics
01-13-15, 01:43 PM
Replies: 13
Views: 1,100
Posted By Airburst

Likewise if it's a Sturmey-Archer, they're...

Likewise if it's a Sturmey-Archer, they're similarly good at keeping crap out.
Forum: Bicycle Mechanics
01-13-15, 12:15 PM
Replies: 21
Views: 5,068
Posted By Airburst

All the one-piece cranks I've come across have...

All the one-piece cranks I've come across have just had the right-hand bearing cone holding the chainring in place, although the cones did have notches on them like a lockring. I've just used a brass...
Forum: Bicycle Mechanics
01-09-15, 08:22 AM
Replies: 15
Views: 7,323
Posted By Airburst

It's hard to tell which it is from where the rim...

It's hard to tell which it is from where the rim ends up if it's only a minor misalignment of the wheel. If it was severe enough to make adjusting the brake difficult or cause tyre/fork blace...
Forum: Bicycle Mechanics
01-08-15, 03:14 AM
Replies: 5
Views: 5,920
Posted By Airburst

No to the first, the clamp area of almost any...

No to the first, the clamp area of almost any drop bar made in the last 50 years is 23.8mm rather than 22.2mm like an upright bar, and although I've bent out the steel clamp bands on cheap...
Forum: Bicycle Mechanics
01-08-15, 03:09 AM
Replies: 3
Views: 1,990
Posted By Airburst

In a word, no. That would not do the stem any...

In a word, no. That would not do the stem any good, and I wouldn't feel confident riding a bike where I'd bent the stem clamp out that far. I'll ride some pretty sketchy stuff, too...

I'd say...
Forum: Bicycle Mechanics
01-07-15, 05:45 PM
Replies: 13
Views: 3,170
Posted By Airburst

I wish it were that simple, and no, it's a...

I wish it were that simple, and no, it's a 18-tooth sprocket. The spacers are out of a couple of junk cassettes I pulled apart.



I do appreciate the compliment there, thank you! Hopefully...
Forum: Bicycle Mechanics
01-07-15, 04:05 PM
Replies: 13
Views: 3,170
Posted By Airburst

I went out again armed with a headtorch and...

I went out again armed with a headtorch and checked it, and the chain has plenty of side-to-side play in it when it's on the sprocket. It's a 1/8" chain and sprocket. My next idea is to just go and...
Forum: Bicycle Mechanics
01-07-15, 03:06 PM
Replies: 125
Views: 25,066
Posted By Airburst

I guess that's a hazard of being a spectator at...

I guess that's a hazard of being a spectator at these events!



Don't worry, I do take that sort of thing as a compliment! I do need to post here a lot more, giving back to the people who've...
Forum: Bicycle Mechanics
01-07-15, 12:56 PM
Replies: 125
Views: 25,066
Posted By Airburst

I am not an easy person to render speechless, but...

I am not an easy person to render speechless, but the sheer level of misapplied physics involved here managed to leave me temporarily lost for words...

:popcorn
Forum: Bicycle Mechanics
01-07-15, 12:41 PM
Replies: 13
Views: 3,170
Posted By Airburst

Well, I get skipping on the old stamped sprocket...

Well, I get skipping on the old stamped sprocket I took off tonight, and the new CNCed Halo sprocket I replaced it with, so I'm fairly sure I can eliminate the sprocket as the issue. I've oiled the...
Forum: Bicycle Mechanics
01-07-15, 12:26 PM
Replies: 13
Views: 3,170
Posted By Airburst

I'll take a few tomorrow once it's light.

I'll take a few tomorrow once it's light.
Forum: Bicycle Mechanics
01-07-15, 12:25 PM
Replies: 33
Views: 1,916
Posted By Airburst

My biggest one is probably frayed cables, which I...

My biggest one is probably frayed cables, which I make every effort to avoid on my own bikes, but fixing other people's is always a minefield. Tetanus, anyone?

All my other injuries are one-time...
Forum: Bicycle Mechanics
01-07-15, 12:17 PM
Replies: 5
Views: 3,096
Posted By Airburst

Either of these options would be my suggestion. ...

Either of these options would be my suggestion. U-brakes are available for any price point thanks to the BMX market - you can get cheap ones or really blingy lightweight ones depending how much...
Forum: Bicycle Mechanics
01-07-15, 12:09 PM
Replies: 13
Views: 3,170
Posted By Airburst

Singlespeed chain skip, round 2

I pulled my old Caloi MTB out of the shed over Christmas in an effort to get the drivetrain running, but I've still had no luck stopping the chain skipping. It's a singlespeed drivetrain, with a...
Forum: Bicycle Mechanics
11-08-14, 01:10 PM
Replies: 16
Views: 6,159
Posted By Airburst

That's generally how mechanical disc brake...

That's generally how mechanical disc brake systems operate, but all the hydraulic ones I've seen have both pads mounted on pistons so they both move.
Forum: Bicycle Mechanics
11-08-14, 05:06 AM
Replies: 76
Views: 7,855
Posted By Airburst

SA offer pretty much every internal part as a...

SA offer pretty much every internal part as a spare, so if anything does go wrong with it you'll be able to get it going again, which is an advantage you don't get with Shimano.

The direct...
Forum: Bicycle Mechanics
11-05-14, 04:26 AM
Replies: 34
Views: 3,995
Posted By Airburst

Which locknut are you thinking of removing? I...

Which locknut are you thinking of removing? I doubt it's completely superfluous, why would the manufacturer waste money putting a part that's not necessary on the hub?

I'm also not 100% sure SA...
Forum: Bicycle Mechanics
11-04-14, 05:33 PM
Replies: 34
Views: 3,995
Posted By Airburst

Non-parallel dropouts are bad on any bike, as...

Non-parallel dropouts are bad on any bike, as they exert a bending force on the axle when you tighten the axle nuts or skewer Bending the axle (elastically - it springs back when you undo the nuts...
Forum: Bicycle Mechanics
11-01-14, 04:56 AM
Replies: 76
Views: 7,855
Posted By Airburst

I've used both the SA 5-speed and 8-speed. The...

I've used both the SA 5-speed and 8-speed. The 5-speed takes a little while to break in and can be a little rough in first and fifth gear while it does that, but I've never had any trouble with it...
Forum: Bicycle Mechanics
10-29-14, 06:50 PM
Replies: 11
Views: 4,183
Posted By Airburst

Yes, the tube sticking out of the top of the fork...

Yes, the tube sticking out of the top of the fork crown is the steerer tube.
Forum: Bicycle Mechanics
10-22-14, 03:02 AM
Replies: 11
Views: 2,433
Posted By Airburst

Which ones don't? I've put new-style NIG...

Which ones don't? I've put new-style NIG internals into an old shell from the mid '70s with no trouble, as well as the aforementioned swap going the other way.




Weirdly, last time I went...
Forum: Bicycle Mechanics
10-21-14, 05:28 PM
Replies: 6
Views: 7,870
Posted By Airburst

I attempted to dismantle a set of Zoom...

I attempted to dismantle a set of Zoom double-crown forks once with a view to using bits of them to make a stretch chopper. Some of them have allen-headed bolts you can undo through the holes in the...
Forum: Bicycle Mechanics
10-21-14, 05:26 PM
Replies: 11
Views: 2,433
Posted By Airburst

I've actually put the innards from an old (and I...

I've actually put the innards from an old (and I mean seriously old, it had a threaded driver, meaning it's from sometime in the '50s at the latest) SA drum brake hub into a modern XRD-3 shell. It...
Forum: Bicycle Mechanics
10-21-14, 08:24 AM
Replies: 11
Views: 2,433
Posted By Airburst

It will be very difficult to lace a 40-spoke hub...

It will be very difficult to lace a 40-spoke hub onto anything other than a 40-spoke rim, unfortunately. There are ways it can be done, but you'll have mismatched spoke lengths spoke tensions,...
Forum: Bicycle Mechanics
10-14-14, 11:48 AM
Replies: 45
Views: 7,310
Posted By Airburst

All the internal parts for the Sturmey-Archer...

All the internal parts for the Sturmey-Archer hubs are available as spares if anything fails, unlike the Shimano ones, so I'd say the SA will last longer.
Forum: Bicycle Mechanics
10-14-14, 05:22 AM
Replies: 45
Views: 7,310
Posted By Airburst

Yes you can lace a nexus hub onto a 700c rim. ...

Yes you can lace a nexus hub onto a 700c rim. The rim doesn't care what hub's laced to it.

Yes, you can use any standard short-pull brake lever with caliper brakes. Just don't get one that's...
Forum: Bicycle Mechanics
10-12-14, 03:33 PM
Replies: 32
Views: 9,101
Posted By Airburst

That's most likely a result of the swaging...

That's most likely a result of the swaging process that was used to attach the rings - I've seen a number of lower-end cranksets with swaging marks that look like splines. A picture would confirm...
Forum: Bicycle Mechanics
10-12-14, 01:50 PM
Replies: 22
Views: 1,320
Posted By Airburst

You do, but you initially asked about "disc...

You do, but you initially asked about "disc specific rims", which is not the same as "disc compatible wheelsets". Disc-compatible rims are not required - disc compatibility for a wheelset is only...
Forum: Bicycle Mechanics
10-12-14, 01:45 PM
Replies: 32
Views: 9,101
Posted By Airburst

The chainrings are almost certainly swaged onto...

The chainrings are almost certainly swaged onto the crank arm. Only a few BMX cranksets with splined BB spindles have a chainring that's not attached to the crank arm, and those are still only...
Forum: Bicycle Mechanics
10-10-14, 02:41 AM
Replies: 8
Views: 908
Posted By Airburst

As for interchangability between bikes, most...

As for interchangability between bikes, most modern mountain bikes use 135mm spacing for the rear dropouts, most modern road bikes use 130mm, and fixies use even less, sometimes as low as 110mm. ...
Forum: Bicycle Mechanics
10-10-14, 02:35 AM
Replies: 22
Views: 1,320
Posted By Airburst

This. All a manufacturer means by "disc brake...

This. All a manufacturer means by "disc brake rims" is that the rim either doesn't have the braking surface machined after the coating's applied to the rim, or doesn't have a flat braking surface at...
Forum: Bicycle Mechanics
10-08-14, 03:51 AM
Replies: 3
Views: 756
Posted By Airburst

A 70mm wide BB shell where both sides are...

A 70mm wide BB shell where both sides are right-hand threaded (clockwise to tighten, as you've said) almost certainly has italian threads.

If the shell is actually 68mm with both sides...
Forum: Bicycle Mechanics
10-01-14, 11:58 AM
Replies: 5
Views: 1,345
Posted By Airburst

After Fietsbob's post I feel I should add "and...

After Fietsbob's post I feel I should add "and can put it in the desired horizontal location" - singlespeed chain setups (including IGHs) need the chainring and rear sprocket to be lined up properly,...
Forum: Bicycle Mechanics
10-01-14, 11:51 AM
Replies: 28
Views: 6,819
Posted By Airburst

Indexed shifters obviously have to match the...

Indexed shifters obviously have to match the number of gears you have on the rear and the brand of rear derailleur, just like any other shifter, but friction will work with almost anything. Given...
Forum: Bicycle Mechanics
10-01-14, 11:37 AM
Replies: 5
Views: 1,345
Posted By Airburst

You can use any crank that'll take the size of...

You can use any crank that'll take the size of chainring you want.
Forum: Bicycle Mechanics
09-28-14, 05:19 PM
Replies: 6
Views: 5,799
Posted By Airburst

You should be able to adjust the headset so...

You should be able to adjust the headset so there's no play at all, but so the fork still turns freely. If you can't, something's wrong, either the headset is damaged, worn or incorrectly assembled.
Forum: Bicycle Mechanics
09-28-14, 04:40 PM
Replies: 6
Views: 959
Posted By Airburst

Co-op mechanic rather than high-zoot shop...

Co-op mechanic rather than high-zoot shop mechanic here, but here's a non-comprehensive list in no particular order:

Ancient gas-pipe framed Raleigh I pulled out of a pile of scrap at the co-op...
Forum: Bicycle Mechanics
09-26-14, 02:50 PM
Replies: 20
Views: 1,227
Posted By Airburst

As a matter of fact I know at least one of my...

As a matter of fact I know at least one of my professors works on bikes, although I think it's something he's been doing for years rather than something he's started since being an academic. I've...
Forum: Bicycle Mechanics
09-26-14, 06:06 AM
Replies: 33
Views: 3,403
Posted By Airburst

Part of the reason I do it is the ability to lace...

Part of the reason I do it is the ability to lace custom wheels, i.e. I built a set of 20" wheels with Sturmey Archer drum brake hubs for a small-wheel bike, I'd never have found those pre-built.
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