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Search: Posts Made By: JohnDThompson
Showing results 1 to 50 of 1000
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Forum: Classic & Vintage
06-13-24, 07:14 AM
Replies: 11
Views: 260
Posted By JohnDThompson

I use short pieces of aquarium aerator tubing. A...

I use short pieces of aquarium aerator tubing. A few bucks gets you a lifetime supply....
Forum: Classic & Vintage
06-13-24, 07:09 AM
Replies: 10
Views: 155
Posted By JohnDThompson

Looks like a hooked bead on the sidewalls, which...

Looks like a hooked bead on the sidewalls, which suggests a clincher-type rim.

That said, there have been rims designed to accommodate both clinchers and tubular tires, e.g. the Super Champion...
Forum: Bicycle Mechanics
06-13-24, 06:24 AM
Replies: 13
Views: 549
Posted By JohnDThompson

Nothing fancy is needed: ...

Nothing fancy is needed:
https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/785x1080/cable_tidy_843065d8760b0693ca8979a9f70287955d33fd9a.jpg
Forum: Bicycle Mechanics
06-13-24, 06:11 AM
Replies: 46
Views: 5,266
Posted By JohnDThompson

As I noted way back in post #8...

As I noted way back in post #8 (https://www.bikeforums.net/22210204-post8.html), unloaded spinning has no real relevance to performance under load.
Forum: General Cycling Discussion
06-12-24, 07:43 PM
Replies: 5
Views: 255
Posted By JohnDThompson

Upload photos into an "album" under your user...

Upload photos into an "album" under your user account here and one of us can link to them so they show up here. Or upload them to a 3rd-party site like flicker or imgur and provide a link (which you...
Forum: Singlespeed & Fixed Gear
06-12-24, 07:40 PM
Replies: 24,591
Views: 2,703,850
Posted By JohnDThompson

Dang, that's tempting! :lol:

Dang, that's tempting! :lol:
Forum: Framebuilders
06-12-24, 07:29 PM
Replies: 4
Views: 172
Posted By JohnDThompson

+1 this. For a chainstay stop, I'd clamp a...

+1 this. For a chainstay stop, I'd clamp a needle-nose vise-grip onto the stop, position it over a bucket of water it so gravity will make it drop into the water when the braze is molten. Keep the...
Forum: General Cycling Discussion
06-12-24, 04:01 PM
Replies: 5
Views: 255
Posted By JohnDThompson

Are you referring to a quill-type seatpost? They...

Are you referring to a quill-type seatpost? They turn up pretty regularly on e.g. eBay, but you need to know what diameter your frame needs.
Forum: Classic & Vintage
06-07-24, 09:13 AM
Replies: 11
Views: 299
Posted By JohnDThompson

A GB (Gerry Burgess) randonneur-bend bar was...

A GB (Gerry Burgess) randonneur-bend bar was stock on the Sports Tourer. Be aware you will likely need the Schwinn-diameter stem (0.833"/21.15mm) to fit in the steer tube, and the headset uses...
Forum: Classic & Vintage
06-07-24, 07:57 AM
Replies: 34
Views: 1,277
Posted By JohnDThompson

:thumb: Good point about flipping Uniglide...

:thumb:
Good point about flipping Uniglide cassette sprockets to get a fresh wear surface. The only caveat I'd mention is that the smallest sprocket is threaded, to hold all the other sprockets in...
Forum: Classic & Vintage
05-28-24, 02:09 PM
Replies: 34
Views: 1,277
Posted By JohnDThompson

It can be very difficult to diagnose this from...

It can be very difficult to diagnose this from appearance alone. The definitive diagnosis is the chain skipping under high load, especially on the smallest rear sprockets. The fix, as noted by others...
Forum: Classic & Vintage
05-28-24, 01:59 PM
Replies: 6,583
Views: 827,919
Posted By JohnDThompson

The barrel on the seat lug was threaded M6 x 1...

The barrel on the seat lug was threaded M6 x 1 and shouldn't need a nut to secure the post, unless the barrel is stripped.
Forum: Bicycle Mechanics
05-23-24, 09:00 AM
Replies: 42
Views: 1,892
Posted By JohnDThompson

FWIW, there are other levers with the same...

FWIW, there are other levers with the same geometry as Campagnolo, e.g. SunTour "Superbe," Modolo, some Gran Compe models, etc. that don't carry quite the same degree of brand-premium as Campagnolo.
Forum: Classic & Vintage
05-18-24, 04:39 PM
Replies: 49
Views: 2,371
Posted By JohnDThompson

SunTour, Shimano, Campagnolo, and Simplex all...

SunTour, Shimano, Campagnolo, and Simplex all made bar-end shift levers in that time period. Of those, the SunTour "BarCon" is probably the most common, and one of the best performing (the rare and...
Forum: Classic & Vintage
05-18-24, 04:27 PM
Replies: 35
Views: 1,678
Posted By JohnDThompson

FWIW, Cecil Behringer and Pino Moroni were...

FWIW, Cecil Behringer and Pino Moroni were brazing titanium frames back in the 70s. They even talked Campagnolo into making titanium 1010/A dropouts for their frames....
Forum: Classic & Vintage
05-18-24, 04:04 PM
Replies: 6
Views: 388
Posted By JohnDThompson

Sure, but Superleggero pedals without toeclips...

Sure, but Superleggero pedals without toeclips will also look out of place. FWIW, I still use toeclips and slotted cleats on some of my bikes. And Look/Shimano/Time/etc. clipless pedals are going on...
Forum: Classic & Vintage
05-18-24, 10:34 AM
Replies: 6
Views: 388
Posted By JohnDThompson

The adapter is designed to convert Look-type...

The adapter is designed to convert Look-type pedals to SPD-type pedals. I suspect it would take a good bit of cobbling around to make it work on your Campagnolo pedals, and an awful shame to...
Forum: Classic & Vintage
05-18-24, 10:26 AM
Replies: 5
Views: 188
Posted By JohnDThompson

From Sutherland's 4th edition (Sutherland uses...

From Sutherland's 4th edition (Sutherland uses the term "Maxy-type axle" to describe any axle with a stud for a securing nut, rather than a threaded hole for a bolt, regardless of whether the axle...
Forum: Classic & Vintage
05-18-24, 10:21 AM
Replies: 11
Views: 492
Posted By JohnDThompson

The Campagnolo dimensions are what became the ISO...

The Campagnolo dimensions are what became the ISO specification, so any ISO-spec headset of the same or shorter stack height should work. The Shimano headset is likely JIS-spec. Most Tange headsets...
Forum: Bicycle Mechanics
05-18-24, 10:08 AM
Replies: 50
Views: 1,552
Posted By JohnDThompson

or the cleats on your shoes. Or the saddle rails....

or the cleats on your shoes. Or the saddle rails. &etc. Noises like that can be hard to track down. Sometimes you need to swap in different parts to isolate the source.
Forum: Bicycle Mechanics
05-14-24, 08:55 PM
Replies: 42
Views: 1,609
Posted By JohnDThompson

Both use standard English thread: 1.370 x 24 tpi

Both use standard English thread: 1.370 x 24 tpi
Forum: General Cycling Discussion
05-14-24, 08:52 PM
Replies: 118
Views: 4,661
Posted By JohnDThompson

It's trickier with non-removeable valve cores,...

It's trickier with non-removeable valve cores, but still possible.
Forum: General Cycling Discussion
05-14-24, 06:39 AM
Replies: 118
Views: 4,661
Posted By JohnDThompson

Most of the time, yes. Big holes still require...

Most of the time, yes. Big holes still require tube patch or replacement.
Forum: Bicycle Mechanics
05-14-24, 06:35 AM
Replies: 42
Views: 1,609
Posted By JohnDThompson

Indeed. If/when the retaining ring on the...

Indeed. If/when the retaining ring on the self-extractor breaks (it happens), no special tool is needed to remove Shimano crank arms.


Except for the Swiss, anyway. And RH thread fixed cups can...
Forum: Bicycle Mechanics
05-13-24, 08:23 PM
Replies: 42
Views: 1,609
Posted By JohnDThompson

I suspect that Campagnolo was suffering from "Not...

I suspect that Campagnolo was suffering from "Not Invented Here" syndrome.
Forum: General Cycling Discussion
05-13-24, 08:16 PM
Replies: 118
Views: 4,661
Posted By JohnDThompson

Well enough for me to still be using it after ten...

Well enough for me to still be using it after ten years.
Forum: General Cycling Discussion
05-13-24, 08:13 PM
Replies: 118
Views: 4,661
Posted By JohnDThompson

FWIW, I use "Stan's."

FWIW, I use "Stan's."
Forum: General Cycling Discussion
05-13-24, 11:28 AM
Replies: 118
Views: 4,661
Posted By JohnDThompson

I assume this was directed at me, regarding use...

I assume this was directed at me, regarding use of sealant in tubes. If so, the answer is "yes." I've been using sealant in tubes on three bikes for over ten years.
Forum: General Cycling Discussion
05-13-24, 09:58 AM
Replies: 118
Views: 4,661
Posted By JohnDThompson

Sure, but the OP's anecdote states that he...

Sure, but the OP's anecdote states that he couldn't find the puncture site to plug that way.
Forum: General Cycling Discussion
05-13-24, 07:51 AM
Replies: 118
Views: 4,661
Posted By JohnDThompson

It seems more a testimonial for sealant than for...

It seems more a testimonial for sealant than for tubeless. You can use sealant in tubes, you know.
Forum: Singlespeed & Fixed Gear
05-11-24, 02:51 PM
Replies: 4
Views: 546
Posted By JohnDThompson

Peter White carrys 5-pin TA rings that will mount...

Peter White carrys 5-pin TA rings that will mount on the Stronglight 49D crank. They're "outer" rings, 3/32" width, for the Pro-5 "Cyclotouriste" crank, but as noted above, they will work with 1/8"...
Forum: Classic & Vintage
05-11-24, 12:33 PM
Replies: 160
Views: 27,067
Posted By JohnDThompson

Maybe the Gipiemme "Crono Sprint" retrofriction...

Maybe the Gipiemme "Crono Sprint" retrofriction levers? These were apparently made for Gipiemme by Simplex.
https://velobase.com/CompImages/Shifter/CD433D74-6C20-4624-8586-14A5CFF31F11.jpeg...
Forum: Classic & Vintage
05-11-24, 12:27 PM
Replies: 11
Views: 552
Posted By JohnDThompson

Here's some you don't often see. Zeus "Cosmos"...

Here's some you don't often see. Zeus "Cosmos" retrofriction shift levers:...
Forum: Bicycle Mechanics
05-11-24, 12:20 PM
Replies: 15
Views: 389
Posted By JohnDThompson

There can be size variations in manufacturing...

There can be size variations in manufacturing both frame tubing and components; perhaps your seat tube is on the small side of acceptable inside diameter, while the post on the large side of...
Forum: Classic & Vintage
05-10-24, 07:15 PM
Replies: 10
Views: 691
Posted By JohnDThompson

Yellow Jersey's "Servizio Corse" are still a...

Yellow Jersey's "Servizio Corse" are still a pretty good deal at $85 for three tires (used to be $50 for three). My experience is that they are straight and round, and measure 21mm wide....
Forum: Bicycle Mechanics
05-10-24, 06:16 PM
Replies: 43
Views: 1,510
Posted By JohnDThompson

Yes, I just had that happen last week. ...

Yes, I just had that happen last week.


Pull out the valve core, squirt some sealant into the tube, reinstall the core, install the tube and tire on the wheel, pump it up and ride it around a...
Forum: Singlespeed & Fixed Gear
05-09-24, 09:12 AM
Replies: 4
Views: 546
Posted By JohnDThompson

Not in my experience. 1/8" chain runs fine on...

Not in my experience. 1/8" chain runs fine on both 1/8" and 3/32" drivetrain components, allowing you to mix and match as needed. TA did make track chainrings for 1/8" chain that can mount on the 49D...
Forum: Classic & Vintage
05-09-24, 08:54 AM
Replies: 26
Views: 1,164
Posted By JohnDThompson

One could probably cobble up a functional...

One could probably cobble up a functional equivalent to the Blackburn adaptor with a couple bolts, nuts, and washers and a thick rubber washer or section of wine cork with a hole for the bolt, to...
Forum: Classic & Vintage
05-07-24, 03:13 PM
Replies: 19
Views: 691
Posted By JohnDThompson

Specifically, the "diver's helmet" type chainstay...

Specifically, the "diver's helmet" type chainstay cable stop uses the stepped ferrule:...
Forum: Classic & Vintage
05-07-24, 03:03 PM
Replies: 4
Views: 542
Posted By JohnDThompson

I see images from the old VAR catalog scan I did...

I see images from the old VAR catalog scan I did for Sheldon Brown all over the place.
Forum: Classic & Vintage
05-06-24, 09:52 AM
Replies: 6
Views: 342
Posted By JohnDThompson

Late production "Record" shifters. ...

Late production "Record" shifters.
https://cimg5.ibsrv.net/gimg/bikeforums.net-vbulletin/956x768/record_shifters_aac83c43f57bd1b2d3a018e1e3ecf8aa1d935b28.jpg
Forum: Classic & Vintage
05-05-24, 08:37 PM
Replies: 21,914
Views: 3,228,522
Posted By JohnDThompson

The crank is Stronglight 93. Not sure about the...

The crank is Stronglight 93. Not sure about the frame, but it appears to have Zeus pista dropouts.
Forum: Classic & Vintage
05-05-24, 09:41 AM
Replies: 199
Views: 9,393
Posted By JohnDThompson

Yes, or removing track sprockets from hubs. Two...

Yes, or removing track sprockets from hubs. Two different radii, to accommodate different sprocket tooth counts.
Forum: Classic & Vintage
05-05-24, 09:39 AM
Replies: 199
Views: 9,393
Posted By JohnDThompson

Yes, and the fact that it is marked "Cholain #2"...

Yes, and the fact that it is marked "Cholain #2" implies that there should be a "Cholain #1" as well, but I've never seen one. I've seen plenty of the #2s (I even have one on my tool board), but...
Forum: Bicycle Mechanics
05-05-24, 09:34 AM
Replies: 89
Views: 3,689
Posted By JohnDThompson

Or a wad of tarry gravel. While it may not lock...

Or a wad of tarry gravel. While it may not lock up the wheel completely, it can still be enough to launch a face-plant.
Forum: Singlespeed & Fixed Gear
05-04-24, 07:49 PM
Replies: 6
Views: 532
Posted By JohnDThompson

Or, to have a different gear ratio on each side....

Or, to have a different gear ratio on each side. The length of your dropout slot will determine how much the sprocket tooth count can differ while still allowing appropriate chain tension....
Forum: Classic & Vintage
05-04-24, 06:24 PM
Replies: 28,070
Views: 4,647,683
Posted By JohnDThompson

The original AW hub had a neutral space between...

The original AW hub had a neutral space between 2nd and 3rd gear that could happen when the shift cable went out of adjustment. In the 1980s, Columbia Bicycle Company persuaded Sturmey-Archer to...
Forum: General Cycling Discussion
05-04-24, 06:15 PM
Replies: 7
Views: 414
Posted By JohnDThompson

Leaving the seat tube open to rain, cigarette...

Leaving the seat tube open to rain, cigarette butts, etc.


My commuter bike, with a short piece of chain securing the saddle to the frame:...
Forum: General Cycling Discussion
05-04-24, 07:09 AM
Replies: 7
Views: 414
Posted By JohnDThompson

It's just as safe as putting an aluminum post in...

It's just as safe as putting an aluminum post in a steel frame. Be sure to use grease or ant-seize in both situations, to prevent electrolytic galling.


Pros: easy adjustment
Cons: easy theft
Forum: Classic & Vintage
05-03-24, 07:39 AM
Replies: 199
Views: 9,393
Posted By JohnDThompson

Yes: ...

Yes:
https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/778x1099/gran_sport_shifter_945ffa1f978071444ed4f920828d6091da2d5656.jpg
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