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Search: Posts Made By: JohnDThompson
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12-06-21, 08:47 PM
Replies: 29
Views: 942
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.
12-05-21, 08:00 PM
Replies: 25
Views: 517
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...
12-04-21, 04:59 PM
Replies: 19
Views: 349
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: 162
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, 09:56 AM
Replies: 909
Views: 271,914
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, 08:57 AM
Replies: 30
Views: 848
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.
Forum: Road Cycling
12-02-21, 09:54 PM
Replies: 36
Views: 1,035
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.
11-29-21, 11:37 AM
Replies: 15
Views: 520
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.
11-27-21, 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?
11-26-21, 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, 08:30 AM
Replies: 133
Views: 3,553
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, 08:01 AM
Replies: 133
Views: 3,553
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: 436
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: 60
Views: 2,348
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: 436
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, 09:20 PM
Replies: 39
Views: 998
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, 09:32 AM
Replies: 8
Views: 471
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, 08:46 AM
Replies: 39
Views: 998
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:
11-21-21, 04:15 PM
Replies: 4
Views: 270
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: 983
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,...
11-19-21, 09:08 AM
Replies: 17
Views: 675
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: 675
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.
11-18-21, 09:37 AM
Replies: 17
Views: 422
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...
11-17-21, 07:17 PM
Replies: 56
Views: 2,401
Posted By JohnDThompson

Those one-piece head tubes start out as flat...

Those one-piece head tubes start out as flat sheet metal. Lug spigots are pressed into the sheet, and the pseudo lug shoreline on the head tube pressed on at the same time. Unfortunately, that pseudo...
11-17-21, 05:44 AM
Replies: 7
Views: 245
Posted By JohnDThompson

Should be fine.

Should be fine.
11-16-21, 06:30 PM
Replies: 12
Views: 656
Posted By JohnDThompson

I'm not aware that Campagnolo ever offered a...

I'm not aware that Campagnolo ever offered a black track crank, but some aftermarket companies offered Campagnolo components anodized in various colors.

Campagnolo did offer BMX components...
11-16-21, 05:01 PM
Replies: 47
Views: 1,428
Posted By JohnDThompson

My daughter has had shingles three times already....

My daughter has had shingles three times already. The first time when she was only ten years old, then twice in her 20s (she's 31 now).



She can't get vaccinated until she turns 50, as the...
11-16-21, 08:37 AM
Replies: 23
Views: 572
Posted By JohnDThompson

Horizontal dropouts suggest mid-80s at the...

Horizontal dropouts suggest mid-80s at the latest, to me. Crank is also of that era, although it's obvious not all the components on the bike are original.
11-15-21, 04:13 PM
Replies: 16
Views: 405
Posted By JohnDThompson

So do I. Stainless SunTour BarCon housing and...

So do I. Stainless SunTour BarCon housing and "Ultraglide" (one of the original lined housings) from the late 70s. Still holding up fine.
11-15-21, 08:33 AM
Replies: 9
Views: 239
Posted By JohnDThompson

Have you checked the hanger alignment?

Have you checked the hanger alignment?
11-13-21, 05:33 PM
Replies: 50
Views: 1,260
Posted By JohnDThompson

They don't. IMO, as paleontologist Stephan Jay...

They don't. IMO, as paleontologist Stephan Jay Gould put it in an entirely different context, "non-overlapping magesteria."
11-13-21, 10:54 AM
Replies: 6
Views: 282
Posted By JohnDThompson

If the stack height works out, you could install...

If the stack height works out, you could install the lower stack from the Prior/Maillard headset and use the upper pressed race and threaded parts from the other headset.
11-13-21, 09:21 AM
Replies: 18
Views: 610
Posted By JohnDThompson

Used mineral spirits can dissolve enough...

Used mineral spirits can dissolve enough grease/oil to leave a film on parts after the mineral spirits have evaporated. A second treatment in clean mineral spirits easily removes that film. So a...
Forum: Road Cycling
11-12-21, 04:35 PM
Replies: 31
Views: 1,244
Posted By JohnDThompson

Short chainstays exacerbate chain deflection, and...

Short chainstays exacerbate chain deflection, and backward rotation of the wheel facilitates derailment.
11-12-21, 06:31 AM
Replies: 26
Views: 640
Posted By JohnDThompson

Doug Fattic makes good points above. It would...

Doug Fattic makes good points above. It would take experience, good tools, and proper equipment to check alignment and make appropriate adjustments. This begs the question: "is it worth it?" Although...
11-08-21, 06:10 PM
Replies: 74
Views: 2,513
Posted By JohnDThompson

Bike shops don't patch tubes because they'd have...

Bike shops don't patch tubes because they'd have to charge for the labor, which makes patching a tube cost more than simply replacing it. If you're doing the labor yourself, you can (as cyccommute...
Forum: Framebuilders
11-05-21, 02:19 PM
Replies: 18
Views: 643
Posted By JohnDThompson

The Trek 1200 series frames used a 7000 series...

The Trek 1200 series frames used a 7000 series heat treated aluminum alloy that isn't recommended for welding. That's why the front derailleur mount and brake bridge used rivets and epoxy. I don't...
11-05-21, 01:47 PM
Replies: 10
Views: 332
Posted By JohnDThompson

As rccardr suggests, make sure the dropouts are...

As rccardr suggests, make sure the dropouts are aligned after spreading. Also check that the rear stays are centered with the frame centerline (i.e. "string test...
11-04-21, 07:11 AM
Replies: 39
Views: 6,524
Posted By JohnDThompson

Not necessarily.

Not necessarily.
11-03-21, 12:25 PM
Replies: 29
Views: 771
Posted By JohnDThompson

Once inserted into the steer tube, the wedge...

Once inserted into the steer tube, the wedge won't be over-riding the stem like it does in your picture. That is, your red line shouldn't be aligned to the edge of the wedge, but rather to the top of...
11-01-21, 07:56 PM
Replies: 53
Views: 1,660
Posted By JohnDThompson

I use an Idéale mod. 92D ("dame") on my Trek 720....

I use an Idéale mod. 92D ("dame") on my Trek 720. It's slightly shorter and wider than the regular mod. 92 and quite comfortable, although the shorter nose makes it trickier to ride "no hands."
10-31-21, 06:36 PM
Replies: 5
Views: 186
Posted By JohnDThompson

3-arm, 116mm cranks were quite popular BITD; lots...

3-arm, 116mm cranks were quite popular BITD; lots of manufacturers and interchangeable rings.
10-31-21, 07:21 AM
Replies: 57
Views: 1,262
Posted By JohnDThompson

Start here: ...

Start here:

https://www.parktool.com/blog/repair-help/rear-derailleur-adjustment
https://www.parktool.com/blog/repair-help/front-derailleur-adjustment
10-30-21, 08:50 PM
Replies: 18,217
Views: 2,093,316
Posted By JohnDThompson

Nice ride through the woods at High Cliff State...

Nice ride through the woods at High Cliff State Park:
10-30-21, 10:20 AM
Replies: 2,177
Views: 241,749
Posted By JohnDThompson

That's what I have used as well. Less than a...

That's what I have used as well. Less than a minute per wheel, even with the Clément red glue. No nasty chemicals, no tiresome scrubbing. Be sure to wear eye protection.
10-30-21, 10:11 AM
Replies: 12
Views: 545
Posted By JohnDThompson

Thumbs up +1 this! :thumb:

+1 this! :thumb:
10-30-21, 09:36 AM
Replies: 12
Views: 518
Posted By JohnDThompson

In addition to checking dropout alignment, as...

In addition to checking dropout alignment, as andrewclaus suggests above, check the threaded parts (axle, cone, locknut) to ensure the threads are not stripped; replace parts as needed.
10-28-21, 07:02 AM
10-25-21, 05:41 PM
Replies: 15
Views: 513
Posted By JohnDThompson

FWIW, I finally finished off my 40+ year old tin...

FWIW, I finally finished off my 40+ year old tin of Proofide this summer. It seemed fine. I used a ~10 year old tin of Proofide (purchased when I couldn't find the other tin. Of course, the old tin...
10-25-21, 05:25 PM
Replies: 21
Views: 489
Posted By JohnDThompson

The problem with the Hozan C-402 is that the taps...

The problem with the Hozan C-402 is that the taps are unpiloted; this makes it hard to keep both sides coaxial. Hozan does offer piloted bottom bracket taps (C-405), but the price is comparable to...
Showing results 1 to 50 of 951
 


 
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