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Search: Posts Made By: JohnDThompson
Showing results 1 to 50 of 1000
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Forum: Classic & Vintage
05-05-24, 09:41 AM
Replies: 74
Views: 2,548
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: 74
Views: 2,548
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: 75
Views: 1,580
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: 4
Views: 105
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: 27,990
Views: 4,561,342
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: 267
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: 267
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: 74
Views: 2,548
Posted By JohnDThompson

Yes: ...

Yes:
https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/778x1099/gran_sport_shifter_945ffa1f978071444ed4f920828d6091da2d5656.jpg
Forum: General Cycling Discussion
05-03-24, 07:15 AM
Replies: 82
Views: 2,931
Posted By JohnDThompson

Same here. And make the oblivious aware...

Same here.


And make the oblivious aware of your presence.
https://m.media-amazon.com/images/I/51JJvRPMW4L._AC_SL1500_.jpg
Forum: Classic & Vintage
05-02-24, 09:27 PM
Replies: 6
Views: 260
Posted By JohnDThompson

All three iterations of the Lambert/Viscount cast...

All three iterations of the Lambert/Viscount cast aluminum fork were subject to CPSC recall. Best to replace it with a steel fork. FWIW, when I compered, the Lambert/Viscount cast aluminum fork is...
Forum: Bicycle Mechanics
05-02-24, 02:47 PM
Replies: 75
Views: 1,580
Posted By JohnDThompson

Upside-down "drop bolt?" I'd be concerned in...

Upside-down "drop bolt?"

I'd be concerned in running with clearance that tight on the front wheel. Something that sticks to the tire could jam under the caliper and lock up the wheel, causing a...
Forum: Classic & Vintage
05-01-24, 12:50 PM
Replies: 439
Views: 22,890
Posted By JohnDThompson

No braze-on cable guides at the bottom bracket...

No braze-on cable guides at the bottom bracket and long-slot Campagnolo 1010A dropouts suggests the frame is 70s production before such braze-ons became standard....
Forum: Classic & Vintage
05-01-24, 12:45 PM
Replies: 18
Views: 550
Posted By JohnDThompson

Not to mention US wire gauges for spokes use...

Not to mention US wire gauges for spokes use smaller numbers for thicker spokes, while French spoke gauges us larger numbers for thicker spokes, and the numbers cross over right in the thicknesses...
Forum: Classic & Vintage
05-01-24, 06:24 AM
Replies: 44
Views: 1,090
Posted By JohnDThompson

The original Super Record Headset came with a...

The original Super Record Headset came with a thin steel spacer; later, it was changed to the thicker aluminum spacer to hold the #712/3 "Spacing spring for headset tool," to help prevent headset...
Forum: Singlespeed & Fixed Gear
04-30-24, 11:01 AM
Replies: 4
Views: 213
Posted By JohnDThompson

I use 1/8" chain. It has the benefit of being...

I use 1/8" chain. It has the benefit of being compatible with chainrings and sprockets for either 3/32" or 1/8" chain.
Forum: Classic & Vintage
04-30-24, 10:00 AM
Replies: 44
Views: 1,090
Posted By JohnDThompson

As @Moe Zhoost...

As @Moe Zhoost (https://www.bikeforums.net/members/moe-zhoost-423003.html) pointed out, make sure you have the proper size balls installed. A Super Record headset uses 22 3/16" balls in each race....
Forum: Bicycle Mechanics
04-30-24, 09:35 AM
Replies: 13
Views: 384
Posted By JohnDThompson

It should have been done before the headset was...

It should have been done before the headset was installed, but if your headset shows signs of needing it (unable to adjust without binding and/or slop), it may benefit from having it done. The proper...
Forum: Classic & Vintage
04-30-24, 09:01 AM
Replies: 12
Views: 606
Posted By JohnDThompson

Let me rephrase my comment. The OEM derailleur on...

Let me rephrase my comment. The OEM derailleur on the Fuji "Finest" model bike was the SunTour-V, not the V-GT.
Forum: Classic & Vintage
04-28-24, 08:02 AM
Replies: 13
Views: 550
Posted By JohnDThompson

It's likely a mismatch between new chain and worn...

It's likely a mismatch between new chain and worn sprocket. If the wheel is original to the bike, it will have a freewheel, not a modern freehub/cassette, and probably only five sprockets. Individual...
Forum: Bicycle Mechanics
04-28-24, 07:41 AM
Replies: 18
Views: 466
Posted By JohnDThompson

When the casing starts to separate from the bead,...

When the casing starts to separate from the bead, it's only a matter of time before it turns into a blow-out. Time for a new tire.
Forum: Classic & Vintage
04-26-24, 04:57 PM
Replies: 14
Views: 504
Posted By JohnDThompson

That's essentially what the Tange "RollerDrive"...

That's essentially what the Tange "RollerDrive" headset is: cylindrical rollers on the bottom race for load handling, balls on the upper race since the upper race only serves to maintain alignment,...
Forum: Classic & Vintage
04-26-24, 04:51 PM
Replies: 14
Views: 504
Posted By JohnDThompson

Are you referring to the fretting damage that...

Are you referring to the fretting damage that leads to "indexed steering?" My experience is the opposite: ball bearing headsets suffer fretting damage much more readily than roller bearing headsets....
Forum: Classic & Vintage
04-26-24, 03:59 PM
Replies: 31
Views: 1,245
Posted By JohnDThompson

IIRC, the Sports Tourer also used a non-standard...

IIRC, the Sports Tourer also used a non-standard headset head tube fittings (also found on some BMX headsets); 32.7mm rather than 30.2mm (ISO) or 30.0mm (JIS).
Forum: Bicycle Mechanics
04-26-24, 03:23 PM
Replies: 19
Views: 504
Posted By JohnDThompson

Do you mean "freewheel with an 8-sprocket...

Do you mean "freewheel with an 8-sprocket cluster?" "Freewheel" and "cassette" are mutually exclusive possibilities. One or the other; not both.

Can you post a close-up picture of the rear...
Forum: General Cycling Discussion
04-25-24, 05:29 PM
Replies: 5
Views: 319
Posted By JohnDThompson

IIRC, the Park FR-7 works on those.

IIRC, the Park FR-7 works on those.
Forum: Classic & Vintage
04-25-24, 05:19 PM
Replies: 14
Views: 504
Posted By JohnDThompson

Yes, that's why I referred to the Stronglight and...

Yes, that's why I referred to the Stronglight and Tange rollers as "cylindrical rollers."


It makes a small difference. The difference in track radius from the inner end of a cylindrical roller...
Forum: Classic & Vintage
04-23-24, 02:48 PM
Replies: 8
Views: 351
Posted By JohnDThompson

It doesn't look French to me; more like a...

It doesn't look French to me; more like a bike-boom era Japanese bike. Have you checked the bottom bracket cups and/or steer tube for English versus metric thread? The MAFAC brakes are incongruous...
Forum: Classic & Vintage
04-23-24, 02:42 PM
Replies: 14
Views: 504
Posted By JohnDThompson

Tapered roller bearings combine high...

Tapered roller bearings combine high load-handling with low friction, but are pretty fussy about alignment. Cylindrical roller bearing like used in the Stronglight A9 and Tange RollerDrive have...
Forum: Classic & Vintage
04-21-24, 10:13 AM
Replies: 25
Views: 856
Posted By JohnDThompson

Velocity Fusion is also available in 36 and 40...

Velocity Fusion is also available in 36 and 40 hole drilling.
https://www.velocityusa.com/product/rims/fusion-622
Forum: Bicycle Mechanics
04-21-24, 10:00 AM
Replies: 49
Views: 25,952
Posted By JohnDThompson

"Newbie." Cut him some slack.

"Newbie."
Cut him some slack.
Forum: Bicycle Mechanics
04-19-24, 08:25 PM
Replies: 22
Views: 782
Posted By JohnDThompson

Actually, with the Dia-Compe G caliper, it's even...

Actually, with the Dia-Compe G caliper, it's even easier than that. There are flats on the pivot bolt that can accept a single thin wrench to center the caliper over the rim:...
Forum: Classic & Vintage
04-19-24, 10:14 AM
Replies: 29
Views: 993
Posted By JohnDThompson

Panaracer Pasela is available in 700C x 23mm and...

Panaracer Pasela is available in 700C x 23mm and tan sidewall:
https://www.amazon.com/panaracer-Pasela-Wire-Bead-Tire/dp/B00B01L3DQ?ref_=ast_sto_dp&psc=1
Forum: Bicycle Mechanics
04-19-24, 07:25 AM
Replies: 22
Views: 782
Posted By JohnDThompson

I've found that removing one shoe from the...

I've found that removing one shoe from the caliper will allow wheel installation and removal without deflating the tire.

To get to the OP's apparent issue, to remove the pad itself from the...
Forum: General Cycling Discussion
04-18-24, 06:19 PM
Replies: 21
Views: 528
Posted By JohnDThompson

While that may be true, there are some grip-shift...

While that may be true, there are some grip-shift designs that make the process sufficiently tedious that it hardly seems worth the bother. My preferred fix is to replace the grip shifter with a...
Forum: Fifty Plus (50+)
04-16-24, 04:05 PM
Replies: 46
Views: 1,395
Posted By JohnDThompson

A resting pulse of 127 is considered tachycardic,...

A resting pulse of 127 is considered tachycardic, and could indicate dehydration. If your urine is dark after riding, that would also be consistent with dehydration. You may only need to drink more...
Forum: Fifty Plus (50+)
04-16-24, 03:53 PM
Replies: 46
Views: 1,395
Posted By JohnDThompson

100/60 is considered a normal blood pressure....

100/60 is considered a normal blood pressure. Were you feeling symptomatic in any way (dizzy, malaise, nausea, etc.)? What was your pulse? Low blood pressure and high pulse rate after exertion could...
Forum: Classic & Vintage
04-16-24, 12:45 PM
Replies: 14
Views: 1,819
Posted By JohnDThompson

Isn't member ussalmon who posted above looking...

Isn't member ussalmon who posted above looking for an original actually Gus Salmon? In which case, he may be able to make a reproduction from the picture you posted.
Forum: Singlespeed & Fixed Gear
04-14-24, 07:52 PM
Replies: 7
Views: 3,211
Posted By JohnDThompson

I've used Miche 1.32" x 24tpi LH lockrings in the...

I've used Miche 1.32" x 24tpi LH lockrings in the past; good quality and a fraction of the price of Phil or Campagnolo lockrings. But they don't seem to be available anymore… :(
Forum: General Cycling Discussion
04-13-24, 07:57 AM
Replies: 31
Views: 1,292
Posted By JohnDThompson

Especially with saddles and seat posts.:lol:

Especially with saddles and seat posts.:lol:
Forum: Bicycle Mechanics
04-12-24, 07:53 AM
Replies: 8
Views: 421
Posted By JohnDThompson

Seriously? The MF-62nn (Shimano 600) and MF-72nn...

Seriously? The MF-62nn (Shimano 600) and MF-72nn (Dura-Ace) freewheels were the first to get the Uniglide twisted tooth treatment, and IMO are among the best best freewheels ever put on the market.
...
Forum: Road Cycling
04-12-24, 06:29 AM
Replies: 45
Views: 2,168
Posted By JohnDThompson

That's a question for the lawyers, which I am not.

That's a question for the lawyers, which I am not.
Forum: Road Cycling
04-11-24, 11:12 AM
Replies: 82
Views: 3,349
Posted By JohnDThompson

The shallow rim wheel will likely be lighter than...

The shallow rim wheel will likely be lighter than the deep-profile race wheels, but less aerodynamic. But the advantage of aerodynamics falls off with reduced speed, while the advantage of light...
Forum: Road Cycling
04-11-24, 11:05 AM
Replies: 45
Views: 2,168
Posted By JohnDThompson

Yes. I was Trek's warranty claim inspector in...

Yes. I was Trek's warranty claim inspector in Waterloo in the mid-80s; eduskator's comment is spot-on. If you raced on the frame, that would also exclude warranty coverage. But warranty claims are...
Forum: Bicycle Mechanics
04-11-24, 10:39 AM
Replies: 31
Views: 755
Posted By JohnDThompson

You line up the middle ring with the middle...

You line up the middle ring with the middle sprocket of the rear cluster to minimize chain deflection in the extreme (large-large and small-small) gear combinations. The inner and outer rings in...
Forum: Fifty Plus (50+)
04-10-24, 08:12 PM
Replies: 23
Views: 772
Posted By JohnDThompson

I did. We had about 84% occlusion here, so it got...

I did. We had about 84% occlusion here, so it got dim but not dark. I had the sun behind me on the return leg, and got the "camera obscura" projection of the eclipse through the helmet vents on the...
Forum: Classic & Vintage
04-10-24, 07:59 PM
Replies: 3
Views: 237
Posted By JohnDThompson

JIS pressed head tube fittings are 30.0mm...

JIS pressed head tube fittings are 30.0mm diameter; ISO are 30.2mm diameter. JIS crown race seats are 27.0mm; ISO are 26.4. A JIS head tube and fork can be trivially converted to ISO spec by a...
Forum: Bicycle Mechanics
04-10-24, 07:45 PM
Replies: 39
Views: 1,815
Posted By JohnDThompson

True, but as more and more sprockets were piled...

True, but as more and more sprockets were piled onto the rear cluster, and longer housing runs used to mount shifters on handlebars became more common, indexed shifting performance became...
Forum: Bicycle Mechanics
04-10-24, 07:01 PM
Replies: 39
Views: 1,815
Posted By JohnDThompson

Compressionless derailleur cable housing only...

Compressionless derailleur cable housing only became necessary with the advent of indexed derailleur shifting, in the mid 80s. Prior to that, friction shifting worked fine with the same type of...
Forum: Classic & Vintage
04-07-24, 06:54 AM
Replies: 11
Views: 583
Posted By JohnDThompson

Maybe "guidonnet" levers? ...

Maybe "guidonnet" levers?
https://cimg2.ibsrv.net/gimg/bikeforums.net-vbulletin/759x537/bars_854ed7adf1d11a947170ee27851f30ef2302fd0e.jpg
Forum: General Cycling Discussion
04-06-24, 06:06 PM
Replies: 182
Views: 7,350
Posted By JohnDThompson

Actually, you need a frame and fork designed to...

Actually, you need a frame and fork designed to handle disc brake loads, and hubs capable of mounting a brake rotor.




No. Machined brake tracks are a relatively modern feature. Unmachined...
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