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Search: Posts Made By: JohnDThompson
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02-03-23, 01:36 PM
Replies: 8
Views: 127
Posted By JohnDThompson

The hole is 5mm diameter. If you can source a 5mm...

The hole is 5mm diameter. If you can source a 5mm plastic rod, you could drill a 2.5mm hole across the rod, tap 3 x 0.5mm thread in the hole, and slice it off to fit the hole.
02-02-23, 08:56 AM
Replies: 8,009
Views: 902,208
Posted By JohnDThompson

The bolts themselves are fairly standard and...

The bolts themselves are fairly standard and should be available at a well-stocked hardware store. The half-round piece is proprietary, but I fabricated a replacement from a 1/2" steel rod. I drilled...
01-31-23, 09:02 AM
Replies: 26,685
Views: 3,901,294
Posted By JohnDThompson

It's not that they're failure prone; it's that...

It's not that they're failure prone; it's that the design makes for problematic braking effectiveness. The coaster brake in the TCW hub is actuated through the internal gear mechanism, which means...
Forum: Framebuilders
01-29-23, 06:01 PM
Replies: 9
Views: 323
Posted By JohnDThompson

"Because chamfered edges are what separates us...

"Because chamfered edges are what separates us from the animals!" 😸
01-27-23, 01:53 PM
Replies: 20
Views: 883
Posted By JohnDThompson

FWIW, axles from Lyotard mod. 45 pedals (and...

FWIW, axles from Lyotard mod. 45 pedals (and possibly others) can be swapped into the mod.23 "Berthet" pedals. I picked up a pair of NOS mod. 23s dirt cheap, because they were 1/2" thread, and made...
01-27-23, 08:42 AM
Replies: 12
Views: 539
Posted By JohnDThompson

Looks like a Zeus crown: ...

Looks like a Zeus crown:
https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/705x544/zeus_crowns_4ba02f17a1011316446af6a8b20d1b0de9aad50c.jpg
01-27-23, 08:18 AM
Replies: 19
Views: 333
Posted By JohnDThompson

The cable housing looks to be in poor condition....

The cable housing looks to be in poor condition. Disconnect the cable from the derailleur and check the housing ends and ferrules. Plastic ferrules can crack, and housing ends can splay; both issues...
01-26-23, 08:37 AM
Replies: 722
Views: 17,048
Posted By JohnDThompson

I'm thinking it's time to close this thread.

I'm thinking it's time to close this thread.
01-25-23, 09:22 PM
Replies: 15
Views: 621
Posted By JohnDThompson

That's not "recycling," but more like sweeping...

That's not "recycling," but more like sweeping the problem under the rug. And doesn't prevent plastic resin microparticles from contaminating the environment.
01-25-23, 12:44 PM
Replies: 4
Views: 182
Posted By JohnDThompson

Unless you're a stickler for matchy-matchy,...

Unless you're a stickler for matchy-matchy, there's no compelling reason for the left arm to be the same brand/model as the right. Match the length and taper (ISO or JIS) and you're golden.
01-25-23, 12:19 PM
Replies: 15
Views: 621
Posted By JohnDThompson

All equipment has finite lifespan. The problem...

All equipment has finite lifespan. The problem with carbon fiber, unlike steel, aluminum, or presumably titanium, is that it is almost impossible to recycle once its service life is done.
01-24-23, 04:44 PM
Replies: 81
Views: 2,008
Posted By JohnDThompson

The larger the jump between rings, the more...

The larger the jump between rings, the more trouble-prone the shift.


It's been tried, with the SunTour Cyclone "extended" front derailleur:...
01-23-23, 09:13 PM
Replies: 7
Views: 458
Posted By JohnDThompson

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg8.ibsrv.net/gimg/bikeforums.net-vbulletin/1000x734/coolstarrybra_bc48bc7a5bde161ec47a27efc229a5d075bda0ed.jpg
01-23-23, 08:05 AM
Replies: 13
Views: 519
Posted By JohnDThompson

Failure at the adjuster bolt hole is fairly...

Failure at the adjuster bolt hole is fairly common. I see it most often on the drive side, after a misaligned derailleur has landed in the spokes. Are you certain this isn't just a crack in the...
01-22-23, 09:01 PM
Replies: 28
Views: 698
Posted By JohnDThompson

That Record crank arm should use a standard 22mm...

That Record crank arm should use a standard 22mm x 1mm extractor. As suggested above, try several versions from different manufacturers. Failing that, Bicycle Research did make a piloted crank...
01-19-23, 07:52 AM
Replies: 12
Views: 318
Posted By JohnDThompson

I've never seen a Campagnolo Swiss thread tap,...

I've never seen a Campagnolo Swiss thread tap, and the catalogs aren't clear whether they were an option; they just say "specify thread" when ordering. I did pick up a VAR Swiss thread tap when Wayne...
01-19-23, 07:28 AM
Replies: 15
Views: 654
Posted By JohnDThompson

The Mavic cartridge is 87mm wide, so there's...

The Mavic cartridge is 87mm wide, so there's plenty of thread engagement for the mounting rings on either a 68 or 70mm shell. You do need to chamfer the ends of the shell to properly mount the...
Forum: Framebuilders
01-18-23, 04:51 PM
Replies: 16
Views: 551
Posted By JohnDThompson

If you're adding a second set of eyelet to a...

If you're adding a second set of eyelet to a dropout that already has an eyelet as part of the forging, use the added eyelet for something that won't carry much load, e.g. mudguards, and use the...
01-17-23, 12:18 PM
Replies: 137
Views: 4,403
Posted By JohnDThompson

IME, pretty much all bike-boom era, low to...

IME, pretty much all bike-boom era, low to mid-level Italian bikes had a nasty weld seam across the bottom bracket shell.
01-16-23, 09:49 AM
Replies: 66
Views: 1,777
Posted By JohnDThompson

Had these for about half a century now: ...

Had these for about half a century now:
https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/665x546/terry_clips_5dc884974b13479528a01303dc35545bdb845994.jpg
01-16-23, 09:47 AM
Replies: 24
Views: 563
Posted By JohnDThompson

Here's another one: ...

Here's another one:
https://silca.cc/pages/app-tire-pressure-calculator
01-15-23, 09:23 AM
Replies: 3,240
Views: 366,528
Posted By JohnDThompson

The picture would be complete with an expensive,...

The picture would be complete with an expensive, unused cat bed next to the chair. :)
01-14-23, 04:34 PM
Replies: 19
Views: 586
Posted By JohnDThompson

While Cinelli and most other investment cast...

While Cinelli and most other investment cast bottom bracket shells do have the relieved section past where the threads end, not all do. And bulge-formed shells tend not to have the relief.
In any...
01-13-23, 01:21 PM
Replies: 124
Views: 3,385
Posted By JohnDThompson

This is entirely subjective, but my experience is...

This is entirely subjective, but my experience is that tubular tires provide a level of comfort similar to what a much wider clincher tire would give.
01-13-23, 12:58 PM
Replies: 11
Views: 470
Posted By JohnDThompson

Interesting. I just tried it here, and you're...

Interesting. I just tried it here, and you're right, the Zeus tool won't fit a splined Atom freewheel. But the Phil and Bicycle Research tools do fit:...
01-12-23, 02:01 PM
Replies: 42
Views: 1,033
Posted By JohnDThompson

It fits Atom/Regina/Zeus/Everest splined...

It fits Atom/Regina/Zeus/Everest splined freewheels, and clears the locknuts as well as the Phil tool. Not common in North America, and the Phil tools are getting hard enough to find.
01-12-23, 11:37 AM
Replies: 42
Views: 1,033
Posted By JohnDThompson

Zeus also produced a thin-wall remover; not sure...

Zeus also produced a thin-wall remover; not sure if that came out before or after the Phil tool....
01-10-23, 07:17 AM
Replies: 722
Views: 17,048
Posted By JohnDThompson

While there undoubtably are situations and...

While there undoubtably are situations and environments where rim wear may be a problem, I submit that it is an exaggeration to claim that covers "most places." I routinely ride wheels that are many...
01-09-23, 03:16 PM
Replies: 42
Views: 1,033
Posted By JohnDThompson

Other, thicker-wall tools were available for the...

Other, thicker-wall tools were available for the Atom/Regina/Zeus splined interface, but those often required removing axle locknuts to seat the tool. In the case of Phil hubs, this wasn't possible,...
01-09-23, 01:30 PM
Replies: 42
Views: 1,033
Posted By JohnDThompson

I've broken thin-wall Phil removers, and Park's...

I've broken thin-wall Phil removers, and Park's two-prong SunTour removers, but not (yet) a Shimano TL-FW30.
01-09-23, 01:03 PM
Replies: 39
Views: 693
Posted By JohnDThompson

No, there are a couple issues that make it...

No, there are a couple issues that make it problematic. First, your frame has an integral derailleur hanger that will interfere with any claw-mount; you'd need to chop off the integral hanger....
01-08-23, 09:05 AM
Replies: 8,009
Views: 902,208
Posted By JohnDThompson

These didn't come in the mail, but I was cleaning...

These didn't come in the mail, but I was cleaning out some old boxes in my basement and came across these. I'm wondering if it's worth the bother of scanning them and putting them on-line, like I did...
01-08-23, 08:56 AM
Replies: 26,685
Views: 3,901,294
Posted By JohnDThompson

Standard 24tpi thread, or Raleigh 26tpi thread?

Standard 24tpi thread, or Raleigh 26tpi thread?
01-08-23, 07:28 AM
Replies: 25
Views: 648
Posted By JohnDThompson

Use a good quality cutter, grind the housing end...

Use a good quality cutter, grind the housing end flat, and open the liner with a sharpened spoke.
01-06-23, 08:42 AM
Replies: 722
Views: 17,048
Posted By JohnDThompson

Why would you replace a bike just because it has...

Why would you replace a bike just because it has unfashionable brakes?
Replies: 16
Views: 844
Posted By JohnDThompson

Make sure that the Victory rear derailleur has...

Make sure that the Victory rear derailleur has the little toothed do-dad to set the angle of the dangle. Without it, the derailleur is a paperweight....
01-03-23, 09:47 AM
Replies: 25
Views: 842
Posted By JohnDThompson

The skewer does not support the weight of the...

The skewer does not support the weight of the bike and rider; it merely provides tension to keep the axle locknuts secure against the dropout face. It is the interface between the dropout face and...
01-03-23, 08:38 AM
Replies: 2
Views: 105
Posted By JohnDThompson

IIRC, the "Eros" is a Japan-built frame, and...

IIRC, the "Eros" is a Japan-built frame, and should be English thread. If you find a "Made in Italy" sticker, it could be Italian thread.

N.B. English thread bottom bracket cups will be marked...
01-01-23, 09:17 AM
Replies: 52
Views: 1,395
Posted By JohnDThompson

Zeus dropouts follow the Campagnolo pattern:...

Zeus dropouts follow the Campagnolo pattern: threaded 10mm hole, with a stop for Campagnolo-type derailleurs....
12-29-22, 09:42 PM
Replies: 14
Views: 313
Posted By JohnDThompson

Ideally, yes. But as a practical matter, not...

Ideally, yes. But as a practical matter, not necessarily. Top tube length is constrained by wheel diameter and pedal overlap with the front tire. This is an issue with small frames especially....
12-29-22, 09:15 AM
Replies: 26
Views: 1,086
Posted By JohnDThompson

Riding fixed with a road group on mixed terrain...

Riding fixed with a road group on mixed terrain pretty much guarantees that you will be dropped on the hills. Too low a gear, and you'll be dropped on the downhill; too high a gear, and you'll be...
12-29-22, 08:18 AM
Replies: 39
Views: 912
Posted By JohnDThompson

Campagnolo and most others varied the width...

Campagnolo and most others varied the width between the bearing shoulders to accommodate 68mm or 70mm shells. Campagnolo also used rifled cups on the Nuovo Record road bottom brackets, which required...
Forum: Framebuilders
12-27-22, 04:25 PM
Replies: 18
Views: 572
Posted By JohnDThompson

I don't have great confidence in a weld repair...

I don't have great confidence in a weld repair there, but if you have a competent and affordable welder nearby, it's worth a try. Chainstay replacement is one of the easiest frame tube replacements,...
12-27-22, 03:41 PM
Replies: 35
Views: 990
Posted By JohnDThompson

I've long suspected a cross-licensing arrangement...

I've long suspected a cross-licensing arrangement between Shimano and Simplex, which may have included shifters. E.g. look at the similarities between these 1970s Simplex SX660 and Shimano Crane rear...
12-27-22, 09:26 AM
Replies: 14
Views: 441
Posted By JohnDThompson

Having worked in bicycle manufacturing, I can say...

Having worked in bicycle manufacturing, I can say that those may be taken into consideration, but saving a few pennies per unit is often a compelling argument.
12-26-22, 04:45 PM
Replies: 12
Views: 452
Posted By JohnDThompson

My wife has knee problems, and I switched her...

My wife has knee problems, and I switched her cranks to 155mm. The reduced flexion/extension with the shorter arms does seem to help.
12-26-22, 04:31 PM
Replies: 8
Views: 384
Posted By JohnDThompson

I don't know specific numbers, but when I started...

I don't know specific numbers, but when I started at Trek in 1980, annual production was in the neighborhood of 10,000 frames (all types). By the time I left in 1986, it was well over 150,000...
12-24-22, 06:44 AM
Replies: 35
Views: 990
Posted By JohnDThompson

Perhaps this can help: ...

Perhaps this can help:
https://cimg6.ibsrv.net/gimg/bikeforums.net-vbulletin/2000x1258/simplex_retrofriction_mounting_comparison_c01e7c2167581e83883b17eeb295cf452e376b4f.jpg
12-22-22, 03:36 PM
Replies: 51
Views: 1,699
Posted By JohnDThompson

Shorter saddles come with a downside, at least...

Shorter saddles come with a downside, at least for me. A shorter nose means your legs are less effective at steering the bike, and when I have a hand off the bars holding a waterbottle or something,...
12-22-22, 03:33 PM
Replies: 174
Views: 4,416
Posted By JohnDThompson

I'm thinking that it's time to close this thread.

I'm thinking that it's time to close this thread.
Showing results 1 to 50 of 1000
 


 
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