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Search: Posts Made By: JohnDThompson
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Forum: Framebuilders
12-06-21, 09:10 PM
Replies: 8
Views: 193
Posted By JohnDThompson

Removing them with heat will destroy a lot of the...

Removing them with heat will destroy a lot of the paint, so be prepared for a repaint. But you're going to need to repaint anyway, to get rid of all the nasty brass splatter whoever brazed those on...
12-06-21, 08:47 PM
Replies: 25
Views: 796
Posted By JohnDThompson

Well, butyric acid is what gives rancid butter...

Well, butyric acid is what gives rancid butter its distinctive odor, so it wouldn't surprise me if hydroxymethylbutyrate shares some of that characteristic.
12-06-21, 08:15 PM
Replies: 7
Views: 207
Posted By JohnDThompson

Yes. It should be marked on the back...

Yes.



It should be marked on the back of the arm: "14 x 125" for French thread; "9/16 x 20F" for English thread. N.B. it is possible that an arm marked "14 x 125" has been re-tapped by a...
12-05-21, 08:23 PM
Replies: 12
Views: 282
Posted By JohnDThompson

IIRC, Tange made Shimano's bottom brackets. Loose...

IIRC, Tange made Shimano's bottom brackets. Loose balls are often substituted for retained balls when serviced, but you can use either. The best retainers hold eleven 1/4" balls; the most common hold...
12-05-21, 08:00 PM
Replies: 19
Views: 374
Posted By JohnDThompson

Chain skipping under load on small sprockets is...

Chain skipping under load on small sprockets is usually a sign that the chain is less worn than the sprockets it tries to engage. The effect is greater on lower tooth count sprockets because wear on...
12-05-21, 08:43 AM
Replies: 23
Views: 478
Posted By JohnDThompson

I'm not aware of any Trek frames that left the...

I'm not aware of any Trek frames that left the factory with an Italian thread bottom bracket shell. Which version of the shell is it, Cinelli with top of the shell cable guides, or Signicast, with...
12-05-21, 08:30 AM
Replies: 15
Views: 502
Posted By JohnDThompson

You can load pictures into an album in your...

You can load pictures into an album in your account profile. From there, a member with more than ten posts can link to them in this discussion.
12-04-21, 04:59 PM
Replies: 18
Views: 322
Posted By JohnDThompson

That's why you avoid those gear combinations....

That's why you avoid those gear combinations. Chain rub on the front derailleur is a function of chainstay length and the number of chainrings and rear sprockets on your bike: short chainstays and...
12-04-21, 04:54 PM
Replies: 3
Views: 153
Posted By JohnDThompson

It's adjustable to a certain extent by how tight...

It's adjustable to a certain extent by how tight you wind the spring before you lock it in place with the end plate. That's almost a three-hand job, although I have accomplished it by clamping an...
12-04-21, 04:28 PM
Replies: 30
Views: 807
Posted By JohnDThompson

Both grease and oil become more viscous at low...

Both grease and oil become more viscous at low temperatures, but grease is more viscous to start with and can prevent the pawls from engaging with the ratchet teeth at low temperatures. This means...
12-04-21, 09:56 AM
Replies: 909
Views: 271,514
Posted By JohnDThompson

Unless the stays are identical on both sides, one...

Unless the stays are identical on both sides, one side will bend more than the other. Many bikes have an additional indent on the drive side chainstay to provide chainring clearance, and that makes...
12-04-21, 09:09 AM
Replies: 10
Views: 294
Posted By JohnDThompson

That is particularly true for those old Universal...

That is particularly true for those old Universal calipers, which I suspect were cast rather than forged.
12-04-21, 08:57 AM
Replies: 30
Views: 807
Posted By JohnDThompson

A light machine oil is sufficient. If you use a...

A light machine oil is sufficient. If you use a motor oil, non-detergent oil is better.
12-03-21, 08:21 AM
Replies: 191
Views: 3,544
Posted By JohnDThompson

Only if both riders share the work. Otherwise, no...

Only if both riders share the work. Otherwise, no benefit, but no loss either; just a feeling of being exploited.
Forum: Road Cycling
12-02-21, 09:54 PM
Replies: 36
Views: 969
Posted By JohnDThompson

There's no functional disadvantage to using a...

There's no functional disadvantage to using a longer-cage derailleur than is strictly necessary, other than a couple grams additional weight for the longer cage.
Forum: Framebuilders
12-01-21, 10:50 PM
Replies: 14
Views: 392
Posted By JohnDThompson

If you have a C compiler, this open-source code...

If you have a C compiler, this open-source code will print a template you can use to miter tubes:

/*----------------------------------------------------------------------------*/
/* Written by...
11-30-21, 07:35 AM
Replies: 15
Views: 513
Posted By JohnDThompson

Is it perhaps metric (25mm x 1mm) thread?

Is it perhaps metric (25mm x 1mm) thread?
11-29-21, 10:24 PM
Replies: 15
Views: 513
Posted By JohnDThompson

The Zeus headset I have is marked "B.S.C." on...

The Zeus headset I have is marked "B.S.C." on both the locknut and the threaded cup:
11-29-21, 11:37 AM
Replies: 15
Views: 513
Posted By JohnDThompson

Yes, that one is a "Criterium" model. ...

Yes, that one is a "Criterium" model.



I have a couple "2000" model bottom brackets; both marked B.S.C. Curiously, I have "ZEUS 2000" marked crank mounting bolts in both steel and titanium.
11-29-21, 11:23 AM
Replies: 6
Views: 255
Posted By JohnDThompson

I picked up a reproduction keeper ring at the...

I picked up a reproduction keeper ring at the Lake Pepin 3-Speed Tour several years ago. I've successfully used it to overhaul several Dynohubs. The link to their "Gentleman Cyclist" accessories page...
11-28-21, 09:57 PM
Replies: 15
Views: 513
Posted By JohnDThompson

Yes.

Yes.
11-27-21, 08:14 AM
Replies: 13
Views: 373
Posted By JohnDThompson

What pads have you tried? In my experience, Kool...

What pads have you tried? In my experience, Kool Stop "salmon" pads are very effective, even with vintage single-pivot sidepull calipers.

Are the rims aluminum, clean, and in good condition?
11-27-21, 07:48 AM
Replies: 16
Views: 501
Posted By JohnDThompson

Chasing existing threads with a sharp tap...

Chasing existing threads with a sharp tap shouldn't be a problem; all it will do is push any debris in the threads out of the way. If the threads have been damaged by e.g. cross-threading, dented...
11-26-21, 08:52 AM
Replies: 16
Views: 501
Posted By JohnDThompson

A wire brush is more effective than a toothbrush...

A wire brush is more effective than a toothbrush at clearing debris from threads. Even better is chasing the threads with a bottom bracket tap, but those are expensive. You can fabricate a functional...
11-26-21, 08:34 AM
Replies: 133
Views: 3,535
Posted By JohnDThompson

Not all of them: you can't slow the bike with...

Not all of them: you can't slow the bike with your legs using a single freewheel. This is particularly evident in groups, where legs can slow you more immediately than a brake system to avoid...
11-26-21, 08:30 AM
Replies: 133
Views: 3,535
Posted By JohnDThompson

But this ignores the human part of the system:...

But this ignores the human part of the system: legs muscles are most efficient over a fairly narrow cadence range; that's why variable gear systems were developed in the first place, allowing cadence...
11-25-21, 10:29 AM
Replies: 36
Views: 783
Posted By JohnDThompson

When your only bike with indexed shifting is a...

When your only bike with indexed shifting is a Sturmey-Archer 3-speed.
11-25-21, 08:03 AM
Replies: 15
Views: 526
Posted By JohnDThompson

Not that I've noticed.

Not that I've noticed.
11-25-21, 08:01 AM
Replies: 133
Views: 3,535
Posted By JohnDThompson

FG also trains you to be comfortable over a...

FG also trains you to be comfortable over a broader cadence range. I won't claim that you get higher or even equal efficiency over that whole range, but you learn that you can keep pedaling at...
11-25-21, 07:55 AM
Replies: 17
Views: 435
Posted By JohnDThompson

Sure. I'd still use a cheap Allen key rather...

Sure. I'd still use a cheap Allen key rather than, say, a Snap-On.
Forum: Road Cycling
11-22-21, 10:07 PM
Replies: 59
Views: 2,202
Posted By JohnDThompson

Besides, at this time of year, sleeveless cycling...

Besides, at this time of year, sleeveless cycling kit is less appropriate than white after Labor Day.
11-22-21, 09:33 PM
Replies: 17
Views: 435
Posted By JohnDThompson

Epoxy a sacrificial Allen key to the bolt and use...

Epoxy a sacrificial Allen key to the bolt and use it to remove the bolt.
11-22-21, 09:24 PM
Replies: 16
Views: 473
Posted By JohnDThompson

I use wool or lycra tights down to about freezing...

I use wool or lycra tights down to about freezing (0C/32F). Below that, I'll wear silk long underwear under the tights.
11-22-21, 09:20 PM
Replies: 39
Views: 997
Posted By JohnDThompson

I have fleece-lined winter bike shoes. But when...

I have fleece-lined winter bike shoes. But when it gets cold enough, I use shoe covers as well.
11-22-21, 09:37 AM
Replies: 8
Views: 215
Posted By JohnDThompson

Viscount/Lambert, repainted and with replacement...

Viscount/Lambert, repainted and with replacement fork. Those are nice riding frames. Check the bottom bracket spindle; if it's not tapered, you'll want to replace it.
11-22-21, 09:32 AM
Replies: 8
Views: 470
Posted By JohnDThompson

Chasing is worth a try. Helicoil or threaded...

Chasing is worth a try. Helicoil or threaded insert would be the definitive fix.
11-22-21, 09:10 AM
Replies: 9
Views: 859
Posted By JohnDThompson

Different crown race and pressed fitting...

Different crown race and pressed fitting diameters, as well:
11-22-21, 08:46 AM
Replies: 39
Views: 997
Posted By JohnDThompson

FWIW, I have a set of old shoe covers for...

FWIW, I have a set of old shoe covers for slotted-cleat pedals that have a synthetic down fill:
11-22-21, 08:25 AM
Replies: 9
Views: 349
Posted By JohnDThompson

If both legs have the same range-of-motion...

If both legs have the same range-of-motion restriction, shorter crank arms are a good option. 165mm arms are quite common and available from multiple manufacturers. Shorter than that, the options are...
11-21-21, 04:15 PM
Replies: 4
Views: 269
Posted By JohnDThompson

Yes, cracked head lugs are the Achilles Heel of...

Yes, cracked head lugs are the Achilles Heel of the AlAn frames.



On any frame, really, but particularly on non-ferrous frames like the AlAn. And of course, there's a tool for that:
11-20-21, 07:47 PM
Replies: 10
Views: 970
Posted By JohnDThompson

That should be fine. Half a millimeter off in...

That should be fine. Half a millimeter off in chainline is insignificant, and Phil bottom brackets allow several millimeters of lateral chainline adjustment, so you should be able to get it perfect,...
11-20-21, 05:26 PM
Replies: 8
Views: 288
Posted By JohnDThompson

Filing the tab off will work, but if you want to...

Filing the tab off will work, but if you want to do it the "official" way, you can use a rectangular file to file a keyway for the tab into the steer tube. Thread the cup down the steer tube first,...
11-20-21, 05:18 PM
Replies: 17
Views: 672
Posted By JohnDThompson

Many Super Record spec'ed bikes came with steel...

Many Super Record spec'ed bikes came with steel Nuovo Record bottom brackets and steel-spindle Superleggero pedals. IIRC, Campagnolo USA marketed this as the "Super Record Pro" group.



That's...
11-20-21, 07:33 AM
Replies: 26
Views: 697
Posted By JohnDThompson

32 or 36 spoke wheels ought to hold you fine. Are...

32 or 36 spoke wheels ought to hold you fine. Are yours perhaps weight-weenie, low spoke count type wheels?

Replace the spoke and keep riding. If others spokes fail, consider rebuilding or...
11-20-21, 06:57 AM
Replies: 27
Views: 848
Posted By JohnDThompson

It would help if we could actually see what...

It would help if we could actually see what you're dealing with.

I think what you're asking is how to optimize the chainline when using a road-type double crank for a single front ring. It is...
11-20-21, 06:24 AM
Replies: 29
Views: 884
Posted By JohnDThompson

Before I retired, my work shifts started at...

Before I retired, my work shifts started at 5:30AM, which meant leaving the house by 4:30AM to have time to ride to work, change into work clothes, etc. It's a nice, quiet time of day to ride. Little...
11-19-21, 09:08 AM
Replies: 17
Views: 672
Posted By JohnDThompson

Yes, the stud-type spindle is definitive for...

Yes, the stud-type spindle is definitive for Super Record, but pressed on races are not. There was a "CON SFERE DA 3/16" steel bottom bracket with pressed races, but it was a bolt-type spindle, not...
11-19-21, 08:52 AM
Replies: 17
Views: 672
Posted By JohnDThompson

The only Campagnolo stud-type (as opposed to...

The only Campagnolo stud-type (as opposed to bolt-type) spindle was the titanium Super Record version 2 spindle.
11-19-21, 08:25 AM
Replies: 29
Views: 548
Posted By JohnDThompson

One advantage of the Phil type mounting rings is...

One advantage of the Phil type mounting rings is that it allows fine-tuning of the chainline. With traditional cup-and-cone or most modern cartridge bottom brackets this would be done with spacers or...
11-18-21, 09:37 AM
Replies: 17
Views: 421
Posted By JohnDThompson

The "skip tooth" large sprockets were to...

The "skip tooth" large sprockets were to facilitate shifting onto those sprockets. Later "Uniglide" and still later "Hyperglide" tooth profiles were found to work better and can be done to improve...
Showing results 1 to 50 of 1000
 


 
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