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Search: Posts Made By: JohnDThompson
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01-16-22, 07:04 PM
Replies: 22
Views: 262
Posted By JohnDThompson

All else equal, a narrow, high-pressure tire will...

All else equal, a narrow, high-pressure tire will have similar rolling resistance as a wider, lower pressure tire. This applies to both clinchers and tubulars. But the wider tire will be more...
01-16-22, 06:41 PM
Replies: 2
Views: 73
Posted By JohnDThompson

In the context of bottom brackets, the ISO/JIS...

In the context of bottom brackets, the ISO/JIS distinction applies only to the spindles, not the cups. As long as the cups' thread matches that of the bottom bracket, and the thickness of the cup...
Forum: Framebuilders
01-16-22, 08:39 AM
Replies: 6
Views: 130
Posted By JohnDThompson

+1 this. I've never needed anything more than hot...

+1 this. I've never needed anything more than hot water and a wire brush to remove the Type B paste flux. Other fluxes tend to leave glassy deposits that need forcible removal.
01-15-22, 02:26 PM
Replies: 15
Views: 9,084
Posted By JohnDThompson

FWIW, SunTour's hubs were made by Sanshin (aka...

FWIW, SunTour's hubs were made by Sanshin (aka "Sunshine"). IIRC, the original Superbe hubs were based on the Sanshin "Pro-Am" hub; the later ones with the sealed bearings were SunTour's design.
01-15-22, 02:11 PM
Replies: 9
Views: 198
Posted By JohnDThompson

You can replace your metric thread hub and...

You can replace your metric thread hub and freewheel with an English thread hub and freewheel. Some derailleur adjustment is likely as the chainline could be subtly different. If the replacement...
01-15-22, 02:05 PM
Replies: 13
Views: 228
Posted By JohnDThompson

Rear frame ends resemble Zeus 2000:

Rear frame ends resemble Zeus 2000:
01-15-22, 09:00 AM
Replies: 11
Views: 229
Posted By JohnDThompson

The Bicycle Research CT-3 has shallow slots, if...

The Bicycle Research CT-3 has shallow slots, if that's what is concerning you; it doesn't mean that it is worn. They work fine.
01-15-22, 08:42 AM
Replies: 13
Views: 595
Posted By JohnDThompson

Joe lived in Sun Prairie when he worked at Trek,...

Joe lived in Sun Prairie when he worked at Trek, before moving to California, so he had roots there. I seem to recall that he was working on a journalism degree at UW-Madison.
01-15-22, 08:31 AM
Replies: 20
Views: 297
Posted By JohnDThompson

Reynolds tubing and domed stay ends indicate a...

Reynolds tubing and domed stay ends indicate a 6nn series frame. The main triangle was brazed in Waterloo, the fork and rear stays were brazed in Japan and shipped to Waterloo to be attached to main...
01-14-22, 08:10 AM
Replies: 7
Views: 186
Posted By JohnDThompson

As Pastor Bob notes, you have to remove the...

As Pastor Bob notes, you have to remove the freewheel to check, either measuring the threads directly, trying a bottom bracket cup of known thread spec on the freewheel threads, or finding the...
01-14-22, 07:54 AM
Replies: 5
Views: 168
Posted By JohnDThompson

The 3-arm, 116mm BCD pattern was adopted by many...

The 3-arm, 116mm BCD pattern was adopted by many manufacturers BITD.
01-13-22, 07:21 PM
Replies: 15
Views: 491
Posted By JohnDThompson

Stem failure results in immediate loss of control...

Stem failure results in immediate loss of control of the bicycle. The only place it isn't a serious danger is if the bicycle isn't being ridden when the stem fails.

N.B. that's how my one stem...
01-13-22, 08:35 AM
Replies: 6
Views: 222
Posted By JohnDThompson

I never had that problem with the Gran Sport...

I never had that problem with the Gran Sport headset, but perhaps I don't ride in as gritty conditions as you.

A short section of inner tube stretched over the lower stack will also protect it...
01-13-22, 08:28 AM
Replies: 9
Views: 345
Posted By JohnDThompson

Sutherland's shows these as suitable for removing...

Sutherland's shows these as suitable for removing TDC freewheels:
01-12-22, 07:33 AM
Replies: 6
Views: 222
Posted By JohnDThompson

Yes, Gran Sport. These are often confused with...

Yes, Gran Sport. These are often confused with Record pista headsets, the salient difference being that the threaded cup has two flats on the Gran Sport, while the Record pista has eight. Like the...
01-11-22, 07:24 PM
Replies: 50
Views: 1,231
Posted By JohnDThompson

This was about 40 years ago. It cracked across...

This was about 40 years ago. It cracked across the clamp; that's all I remember.
01-11-22, 09:33 AM
Replies: 70
Views: 1,366
Posted By JohnDThompson

Nope. I've seen the kind of sausage-making that...

Nope. I've seen the kind of sausage-making that goes into spec'ing bikes for market, and how parts availability can lead to component changes that don't get reflected in the catalogs. I'll use...
01-11-22, 09:01 AM
Replies: 63
Views: 947
Posted By JohnDThompson

Only once, on the Dynohub front wheel of my...

Only once, on the Dynohub front wheel of my Raleigh Superbe.
01-10-22, 07:47 PM
Replies: 4,590
Views: 740,359
Posted By JohnDThompson

That's the "Miles Davis" bike: "kinda blue."...

That's the "Miles Davis" bike: "kinda blue." :innocent:
Forum: Framebuilders
01-10-22, 07:34 PM
Replies: 18
Views: 455
Posted By JohnDThompson

Size "I" adjustable reamer will handle...

Size "I" adjustable reamer will handle 27.0-30.25mm. Ream before cutting the slot, or the blades can catch in the slot. A helical reamer does not have that problem, but AFAIK, they're only available...
01-10-22, 07:24 PM
Replies: 50
Views: 1,231
Posted By JohnDThompson

The only stem I've had fail was a TTT stem, and...

The only stem I've had fail was a TTT stem, and that's where it failed. I don't know if I had been riding it cracked; I was on a loaded tour, stopped for a rest, wind blew the bike over, and when I...
01-10-22, 07:20 PM
Replies: 2,218
Views: 248,498
Posted By JohnDThompson

I've found a wire wheel on a bench grinder makes...

I've found a wire wheel on a bench grinder makes short work of this, less than a minute per wheel, no solvents or scrubbing needed.
01-10-22, 12:52 PM
Replies: 19
Views: 542
Posted By JohnDThompson

The Cinelli BB shells and fork crowns weren't...

The Cinelli BB shells and fork crowns weren't used until the early 80s, and only for a couple years before being replaced by the Signicast shell and socketed seat lugs.



Yes, that was the...
01-10-22, 12:45 PM
Replies: 19
Views: 542
Posted By JohnDThompson

The 1970s production TX900 frames had a fastback...

The 1970s production TX900 frames had a fastback attachment. Later production went to the side attachment.

http://www.vintage-trek.com/images/trek/900Fback.jpg
01-09-22, 04:51 PM
Replies: 65,886
Views: 10,392,895
Posted By JohnDThompson

Replacement fork warrants close inspection of the...

Replacement fork warrants close inspection of the frame for collision damage.
01-09-22, 04:47 PM
Replies: 20
Views: 538
Posted By JohnDThompson

Minor variations in the rim extrusion and spoke...

Minor variations in the rim extrusion and spoke diameters will affect tension readings, the higher the tension, the more pronounced they become. As others have noted, you compromise to minimize both...
01-09-22, 04:44 PM
Replies: 26
Views: 625
Posted By JohnDThompson

The 3-speed, fixed gear hubs (ACS, S3X) don't...

The 3-speed, fixed gear hubs (ACS, S3X) don't have any pawls.
01-09-22, 08:42 AM
Replies: 11
Views: 350
Posted By JohnDThompson

Yes, Stronglight, for 16mm crank bolts. It would...

Yes, Stronglight, for 16mm crank bolts. It would have come with a tommy-bar and proprietary 23.35mm extractor tool. Bonus if you can find those!
01-09-22, 08:13 AM
Replies: 32
Views: 769
Posted By JohnDThompson

Carbon fiber rims may have a special brake track...

Carbon fiber rims may have a special brake track bonded to the rim because carbon fiber does not tolerate abrasion well, but aluminum rims are continuous extrusions with no separate track.
...
01-08-22, 03:52 PM
Replies: 32
Views: 769
Posted By JohnDThompson

No. Machined brake tracks are to make braking...

No. Machined brake tracks are to make braking action smooth. Sometimes it is done to remove a hard anodized layer that can inhibit brake performance. The machining removes material from the...
01-08-22, 03:36 PM
Replies: 26
Views: 625
Posted By JohnDThompson

I corresponded with him over the internet, but...

I corresponded with him over the internet, but never met him in person. I did send him the scans of my VAR catalog, which he posted on the web site.



His wife auctioned some of them off over...
01-08-22, 07:20 AM
Replies: 50
Views: 3,018
Posted By JohnDThompson

Had to make it work with only one roll of...

Had to make it work with only one roll of handlebar tape.
01-07-22, 07:33 AM
Replies: 36
Views: 863
Posted By JohnDThompson

Get a cheap steel post in the proper diameter on...

Get a cheap steel post in the proper diameter on which to clamp. Pull out the current saddle and post (mark insertion height first), inset cheap post, clamp on cheap post.

If you routinely work on...
01-06-22, 08:22 AM
Replies: 16
Views: 19,604
Posted By JohnDThompson

Lime is an orphan product, so finding replacement...

Lime is an orphan product, so finding replacement parts for its proprietary components will always be an issue. That said, here are a couple documents that may prove useful:
...
Forum: Framebuilders
01-05-22, 03:52 PM
Replies: 4
Views: 246
Posted By JohnDThompson

"Torch & File" (an offshoot of Strawberry...

"Torch & File" (an offshoot of Strawberry Bicycles) offers a sharpening service. I've not used them, but if Andy Newlands and Mark DiNucci are involved, it's got to be a good sign:
...
01-05-22, 03:41 PM
Replies: 59
Views: 8,390
Posted By JohnDThompson

Yes, they are made differently from other rims....

Yes, they are made differently from other rims. Most rims start as straight extrusions that are cut to length, rolled onto a circle, and pinned or welded closed. Hi-E rims start as aluminum sheet,...
01-05-22, 03:31 PM
Replies: 27
Views: 577
Posted By JohnDThompson

Formula hubs use ISO sprocket thread: 1.37" x...

Formula hubs use ISO sprocket thread: 1.37" x 24tpi



Formula hubs use ISO lockring thread as well: 1.29" x 24tpi LH



I've only seen ISO thread track sprockets. Perhaps there are metric...
01-05-22, 03:05 PM
Replies: 20
Views: 647
Posted By JohnDThompson

I hope they have a bike rack, then.

I hope they have a bike rack, then.
01-05-22, 08:49 AM
Replies: 4,799
Views: 505,977
Posted By JohnDThompson

"73" on the upper head lug? That's probably the...

"73" on the upper head lug? That's probably the lug angle, not the manufacture date. But considering the components and other characteristics of the bike, it's probably not too far off the...
01-05-22, 08:34 AM
Replies: 33
Views: 3,913
Posted By JohnDThompson

I've done that as well. The pins usually only...

I've done that as well. The pins usually only come on the larger ring sizes, and my big ring tooth count has dropped considerably as I get older. My preferred big ring tooth counts (46-48T) don't...
01-05-22, 08:30 AM
Replies: 65,886
Views: 10,392,895
Posted By JohnDThompson

That's a steel dropout, so no worries re-aligning...

That's a steel dropout, so no worries re-aligning it.
01-05-22, 07:08 AM
Replies: 26
Views: 739
Posted By JohnDThompson

Yes, if you want to replace the entire headset....

Yes, if you want to replace the entire headset. Or, you could mill the head tube and fork crown race seat to ISO dimensions (30.2mm head tube ID; 26.4mm crown race seat) and install an ISO-spec...
01-04-22, 04:38 PM
Replies: 26
Views: 739
Posted By JohnDThompson

Many Japanese headsets are offered in both JIS...

Many Japanese headsets are offered in both JIS (27.0mm) and ISO (26.4mm) crown race inner diameter for each model. BITD, we could order crown races separately from complete headsets. Don't know if...
01-04-22, 04:14 PM
Replies: 27
Views: 577
Posted By JohnDThompson

Only one side of the rear hub is shown in the...

Only one side of the rear hub is shown in the pictures. The vendor does describe the hubs as "Formula High flange fixed/free hubs," where the rear hub would have freewheel threading on one side, and...
01-04-22, 04:00 PM
Replies: 13
Views: 189
Posted By JohnDThompson

https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/img_0946_82d11bd4fc56be61d16f99bd560ea0391816106e.jpg

That's just a swaged crank arm. This is done on low-end cranks so the same...
01-03-22, 10:31 PM
Replies: 21
Views: 512
Posted By JohnDThompson

The Continental frame uses an Ashtabula one-piece...

The Continental frame uses an Ashtabula one-piece crank. You will need to use a converter to mount a square-taper 3-piece crank to get the gearing you desire.
01-03-22, 10:27 PM
Replies: 21
Views: 512
Posted By JohnDThompson

No, I'm not aware of any freewheel that offers an...

No, I'm not aware of any freewheel that offers an 11 tooth small sprocket. 12T is the smallest I've seen. Nor am I aware of any freewheel with larger than 38T large sprocket. To get what you want,...
01-03-22, 08:44 AM
Replies: 21
Views: 512
Posted By JohnDThompson

Your Continental has a freewheel hub, not a...

Your Continental has a freewheel hub, not a modern freehub/cassette system. The largest freewheel sprocket I'm aware of is 38T on a SunTour "Alpine" 5-sprocket freewheel. These are not common...
01-03-22, 08:24 AM
Replies: 5
Views: 190
Posted By JohnDThompson

I don't see anything egregiously wrong in the...

I don't see anything egregiously wrong in the pictures. Probably not an internal problem, as others have noted. Pic assist:

https://i.imgur.com/RvbprbE.png

https://i.imgur.com/iaiaWZ7.png
...
01-02-22, 03:32 PM
Replies: 54
Views: 1,331
Posted By JohnDThompson

I'm not keen on using a CO2 inflator, but I...

I'm not keen on using a CO2 inflator, but I started carrying one anyway, along with a frame pump. I have a history of injuries on both shoulders, and after a flat a couple years ago, I discovered I...
Showing results 1 to 50 of 1000
 


 
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