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Search: Posts Made By: JohnDThompson
Showing results 1 to 50 of 306
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06-03-20, 12:44 PM
Replies: 22
Views: 348
Posted By JohnDThompson

If the lower race is in good condition, there's...

If the lower race is in good condition, there's no compelling need to replace anything but the upper parts. If you're lucky, an ISO/English threaded cup will work with the present upper race, so you...
06-01-20, 02:40 PM
Replies: 19
Views: 424
Posted By JohnDThompson

The seat tube on small frames may be too short to...

The seat tube on small frames may be too short to hold a water bottle. This is exacerbated by modern, sloping top tube designs that result in a short seat tube.

If not, you can use clamps to...
05-31-20, 04:26 PM
Replies: 19
Views: 371
Posted By JohnDThompson

How does it compare to your old chain (assuming...

How does it compare to your old chain (assuming you didn't make any changes in gearing)?

If no changes, is there a reason why you'd want or need a different chain length?
05-31-20, 03:37 PM
Replies: 25
Views: 510
Posted By JohnDThompson

Pic assist: ...

Pic assist:

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1504/80-20200531_100312_a86982679f50cc3a206e23b2d30a36b391a88ba7.jpg

Looks like a 1970s Raleigh "Sports." Nothing fancy,...
05-29-20, 06:26 AM
Replies: 15
Views: 361
Posted By JohnDThompson

Most Nervar rings used 128mm BCD, but some used...

Most Nervar rings used 128mm BCD, but some used Stronglight's 122mm BCD:

http://www.os2.dhs.org/~john/5arm-0002.jpg
05-26-20, 07:49 AM
Replies: 17
Views: 481
Posted By JohnDThompson

When the long-cage Simplex SX-410 derailleur died...

When the long-cage Simplex SX-410 derailleur died on my tandem, I didn't have another long-cage Simplex to replace it. So I took the long cage off the SX-410 and put it on an SX-660 instead. The...
05-24-20, 11:31 AM
Replies: 2,607
Views: 227,087
Posted By JohnDThompson

Some Tange bottom bracket cups also used a seal;...

Some Tange bottom bracket cups also used a seal; AFAIK, they are identical to Shimano. I suspect Tange may have made the Shimano-branded cups with seals.
05-24-20, 11:27 AM
Replies: 31
Views: 653
Posted By JohnDThompson

The first production run of the 720s used Cinelli...

The first production run of the 720s used Cinelli bottom bracket shells with brazed-on guides on top of the shell; later production used the Trek shell with cable guides cast into the underside of...
05-23-20, 07:32 PM
Replies: 28
Views: 442
Posted By JohnDThompson

This is one of the two-piece indicators, yes? The...

This is one of the two-piece indicators, yes? The two pieces thread into each other from opposite sides of the hub, and trap the axle key (the part that moves the clutch to change gears) between...
05-23-20, 07:20 PM
Replies: 31
Views: 653
Posted By JohnDThompson

I concur. The 720 was the only Trek frame that...

I concur. The 720 was the only Trek frame that got double eyelets. Later production had cantilever bosses, and the final year they even dropped the double eyelets (labor-saving: we had to mill the...
05-22-20, 07:45 AM
Replies: 19
Views: 358
Posted By JohnDThompson

As far as I can tell, the Gran Sport pedal...

As far as I can tell, the Gran Sport pedal spindles only differed from the higher-end Record and Superleggero pedal spindles in that they lacked the rifling to inhibit contamination. They even...
05-20-20, 06:33 AM
Replies: 5
Views: 104
Posted By JohnDThompson

Your problem will likely be finding a decent...

Your problem will likely be finding a decent metric thread freewheel. Once found, sprockets from comparable freewheels can be swapped onto the metric body; e.g. standard SunTour Pro-Compe sprockets...
05-19-20, 07:03 PM
Replies: 4
Views: 156
Posted By JohnDThompson

You can't, really. Either take the manufacturer's...

You can't, really. Either take the manufacturer's word for it, or do a "spark test" with a grinding wheel:
...
05-17-20, 03:46 PM
Replies: 13
Views: 704
Posted By JohnDThompson

Start by picking a gear on your current set-up...

Start by picking a gear on your current set-up and just not shifting out of it. If you find a gear that works, configure your single-speed to use that same gear ratio.
05-15-20, 05:41 PM
Replies: 15
Views: 365
Posted By JohnDThompson

The drivetrain wears as a unit, but the smaller...

The drivetrain wears as a unit, but the smaller sprockets on the rear cassette tend to wear more because the wear is concentrated on fewer teeth. Putting a new chain on a worn cassette can result in...
05-15-20, 07:53 AM
Replies: 25
Views: 942
Posted By JohnDThompson

I would suggest that for any high-dollar item...

I would suggest that for any high-dollar item sold to someone you don't personally know and trust, avoid PayPal "friends and family." Yes, you'll get charged a transaction fee, but you also get...
05-14-20, 03:22 PM
Replies: 4
Views: 217
Posted By JohnDThompson

Looks pretty nice. Handlebars, pedals, and...

Looks pretty nice. Handlebars, pedals, and kickstand are not stock. I don't recognize the name "Red Schmalzer."
05-13-20, 01:37 PM
Replies: 7
Views: 223
Posted By JohnDThompson

Most derailleur limit bolts either have a thread...

Most derailleur limit bolts either have a thread adhesive or nylon insert to prevent this from happening. How old is the derailleur?
05-12-20, 07:24 AM
Replies: 6
Views: 233
Posted By JohnDThompson

Steel frame? No worries.

Steel frame? No worries.
05-11-20, 08:55 AM
Replies: 13
Views: 338
Posted By JohnDThompson

The 1" x 24tpi die should be fine. If your die...

The 1" x 24tpi die should be fine. If your die stock is unpiloted, you need to be careful to keep it on axis. This is more of an issue when threading an unthreaded tube; extending threads allows the...
05-10-20, 08:36 PM
Replies: 14
Views: 345
Posted By JohnDThompson

Yeah, some headsets are like that. BITD, before...

Yeah, some headsets are like that. BITD, before "Lizardskins," we just cut a section of old inner tube and stretched it over that part to cover the gap.

Worked fine.
05-10-20, 08:32 AM
Replies: 42
Views: 945
Posted By JohnDThompson

FWIW, I've never had a problem using standard...

FWIW, I've never had a problem using standard ferrules in these levers.
05-09-20, 08:11 AM
Replies: 37
Views: 1,158
Posted By JohnDThompson

If you're patient, you can do it by hand. Index...

If you're patient, you can do it by hand. Index the holes off the peak of each tooth. This is a small hole followed by a countersink bit:

http://www.os2.dhs.org/~john/campy-drillium.jpg
05-09-20, 06:58 AM
Replies: 10
Views: 257
Posted By JohnDThompson

Concur with dsbrantjr; clean the threads out with...

Concur with dsbrantjr; clean the threads out with a wire brush and try again. Failing that, you may need to do more aggressive thread chasing. This is best done with a piloted tap set, but often an...
05-09-20, 06:23 AM
Replies: 31
Views: 839
Posted By JohnDThompson

Test fit on an ISO spindle. If the arm sits too...

Test fit on an ISO spindle. If the arm sits too far out on the taper, it's likely the old-style Ofmega taper. There should only be 3-4mm between the end of the spindle and the base of the extractor...
05-08-20, 08:26 AM
Replies: 31
Views: 839
Posted By JohnDThompson

Ofmega used a narrower than standard spindle up...

Ofmega used a narrower than standard spindle up until about 1980. After that, they adopted the dimensions that became the ISO standard.
05-08-20, 07:38 AM
Replies: 26
Views: 1,088
Posted By JohnDThompson

It turns out rolling resistance in bicycle tires...

It turns out rolling resistance in bicycle tires is largely a function of hysteresis losses in the tire casing. For any given tire width and casing design, a higher pressure will result in lower...
05-07-20, 07:40 AM
Replies: 21
Views: 562
Posted By JohnDThompson

I haven't noticed a problem here (running linux...

I haven't noticed a problem here (running linux Xubuntu-18). Perhaps as Troul suggests, it is third-party ads slowing things down? If you have a paid membership, the ads disappear.

Facebook, OTOH,...
05-07-20, 06:57 AM
Replies: 18,971
Views: 3,073,694
Posted By JohnDThompson

I suppose you may be right. After all, the worst...

I suppose you may be right. After all, the worst that can happen is that it doesn't sell for the asking price.
05-06-20, 08:24 PM
Replies: 18,971
Views: 3,073,694
Posted By JohnDThompson

Yes, it's nicely done, and has many nice touches....

Yes, it's nicely done, and has many nice touches. But dolling up a bike like that is a labor of love, and it is not realistic to expect to recoup the money and effort put into building it up in that...
05-06-20, 07:20 AM
Replies: 5
Views: 207
Posted By JohnDThompson

Not "threaded caps," but they perform the same...

Not "threaded caps," but they perform the same function as threaded caps and cost less:
...
05-05-20, 11:34 AM
Replies: 2,142
Views: 194,694
Posted By JohnDThompson

I've taken care of your mouse problem. No need...

I've taken care of your mouse problem. No need to thank me
05-05-20, 11:06 AM
Replies: 18
Views: 321
Posted By JohnDThompson

Functionally equivalent, at a fraction of the...

Functionally equivalent, at a fraction of the cost:

https://cdn.instructables.com/FD9/N28J/G5KP8FEI/FD9N28JG5KP8FEI.LARGE.jpg
https://www.instructables.com/id/DIY-Lockring-Pliers/
05-05-20, 07:11 AM
Replies: 13
Views: 238
Posted By JohnDThompson

Good idea, but take one nut from each wheel, as...

Good idea, but take one nut from each wheel, as rear hub axles are typically larger diameter than fronts.

Alternatively, the entire axle set (axle/cones/washers/nuts) can often be purchased to...
05-04-20, 07:46 AM
Replies: 8
Views: 214
Posted By JohnDThompson

Yes, because the threaded interface is not...

Yes, because the threaded interface is not perfect, and seating the fixed cup flange and adjustable cup lockring onto a shell face that is not perpendicular to the axis of the bottom bracket can pull...
05-03-20, 09:49 AM
Replies: 14
Views: 306
Posted By JohnDThompson

Chater Lea thread spec is not the same as Raleigh...

Chater Lea thread spec is not the same as Raleigh 26tpi thread spec, but Phil has offered mounting rings for both:

http://www.os2.dhs.org/~john/1985+BB+CHART-OFFSETS-Phils.jpg
05-02-20, 05:41 AM
Replies: 24
Views: 667
Posted By JohnDThompson

I haven't found a need to use anything myself...

I haven't found a need to use anything myself (perhaps I'm not fast enough for it to be a problem?), but other people may use "Cat-Ears" to block wind noise:

https://www.cat-ears.com/
05-01-20, 06:13 AM
Replies: 22
Views: 496
Posted By JohnDThompson

There's no compelling need to replace the fork...

There's no compelling need to replace the fork with another French-thread fork. The pressed cup dimensions are the same for French and English headsets, so a replacement fork with English threads...
05-01-20, 06:03 AM
Replies: 22,699
Views: 2,510,555
Posted By JohnDThompson

The problem with the TCW series hubs is that the...

The problem with the TCW series hubs is that the coaster brake is actuated through the internal gearing rather than directly. What this means is that when the hub is in "high" gear (i.e. when you are...
04-30-20, 06:05 PM
Replies: 4,731
Views: 521,693
Posted By JohnDThompson

Dura-Ace pedals. Definitely used condition, so I...

Dura-Ace pedals. Definitely used condition, so I won't be afraid to beat on them. But the bearings are still silky-smooth, and that's what counts in my book.
...
04-29-20, 07:14 AM
Replies: 12
Views: 429
Posted By JohnDThompson

Bullhorn handlebars were originally developed for...

Bullhorn handlebars were originally developed for special-purpose riding; time trials and pursuit riding on the track, where the aerodynamic benefits were felt to outweigh the lack of multiple hand...
04-26-20, 08:36 AM
Replies: 37
Views: 1,117
Posted By JohnDThompson

Our community gamelan group, now sadly on hold...

Our community gamelan group, now sadly on hold due to the virus:

https://www.lawrence.edu/sites/default/files/bss/desktop/gamelan%201.jpg...
04-25-20, 05:32 PM
Replies: 12
Views: 372
Posted By JohnDThompson

That hasn't been my experience. I bought a couple...

That hasn't been my experience. I bought a couple pairs of Protogs merino wool shorts back in the late 70s, and they're still doing fine. The original leather chamois and waist elastic wore out and...
04-22-20, 12:51 PM
Replies: 152
Views: 7,128
Posted By JohnDThompson

Sometimes: ...

Sometimes:

http://www.os2.dhs.org/~john/july-4.jpg
04-21-20, 07:00 PM
Replies: 6
Views: 489
Posted By JohnDThompson

OP has a 1/8" freewheel, so he must also have...

OP has a 1/8" freewheel, so he must also have 1/8" chain. The chainring won't be a problem, as 1/8" chain works fine with either 1/8" or 3/32" drivetrain components. It's 3/32" chain that limits you...
04-21-20, 05:53 PM
Replies: 7
Views: 239
Posted By JohnDThompson

Crank choice will dictate bottom bracket...

Crank choice will dictate bottom bracket selection. This is especially true if you are looking for a period-correct Campagnolo bottom bracket for a vintage Campagnolo crank.

Campagnolo USA...
04-21-20, 08:33 AM
Replies: 87
Views: 13,034
Posted By JohnDThompson

I'll comment that jonwvara's mod. 93 triplizer...

I'll comment that jonwvara's mod. 93 triplizer ring works very well:

http://www.os2.dhs.org/~john/93-triple-1.jpg

http://www.os2.dhs.org/~john/93-triple-2.jpg
...
04-19-20, 07:44 PM
Replies: 23
Views: 637
Posted By JohnDThompson

When I burned out on bicycle mechanics, I became...

When I burned out on bicycle mechanics, I became an RN and worked in hospitals for the next couple decades. Now that I'm retired, I've been able to return to bicycle mechanics on my own terms,...
04-18-20, 07:40 AM
Replies: 5
Views: 175
Posted By JohnDThompson

Ideally, the plane of the chainring should be...

Ideally, the plane of the chainring should be co-planar with the plane of the sprocket:

http://www.os2.dhs.org/~john/track-chainline.jpg

If they do not line up at first, use spacers under the...
04-18-20, 07:06 AM
Replies: 6,270
Views: 537,312
Posted By JohnDThompson

I thought so as well. The parts illustration...

I thought so as well. The parts illustration above is from Catalog 18, which I think is the final catalog in which Super Record (as we know it) was listed, and no separate Super Record holder is...
Showing results 1 to 50 of 306
 


 
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