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Search: Posts Made By: JohnDThompson
Showing results 1 to 50 of 1000
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08-10-20, 02:20 PM
Replies: 2
Views: 65
Posted By JohnDThompson

Chances are it's either ISO 30.2mm or JIS 30.0mm;...

Chances are it's either ISO 30.2mm or JIS 30.0mm; you can't really tell until you pull the cups and measure. A JIS spec frame and fork can easily be milled to ISO spec, but not vice versa. The path...
08-10-20, 07:17 AM
Replies: 15
Views: 201
Posted By JohnDThompson

Are you perhaps missing a spacer between the...

Are you perhaps missing a spacer between the second and third sprockets?

N.B. If it were my bike, I'd ditch the Maillard freewheel and go with a modern one with profiled teeth on the sprockets.
08-10-20, 07:06 AM
Replies: 12
Views: 221
Posted By JohnDThompson

A mid-70s Motobécane is likely to have metric...

A mid-70s Motobécane is likely to have metric (aka "French" or possibly even "Swiss") bottom bracket thread. I don't think the UN55 or other Shimano cartridges were offered with metric thread....
08-10-20, 06:23 AM
Replies: 10
Views: 264
Posted By JohnDThompson

It would make it a lousy candidate for a fixed...

It would make it a lousy candidate for a fixed gear, but a single freewheel and chain tensioner ought to work fine.
08-09-20, 05:30 PM
Replies: 10
Views: 264
Posted By JohnDThompson

Pretty sure the OP's Cannondale would have...

Pretty sure the OP's Cannondale would have vertical dropouts.
Forum: Framebuilders
08-09-20, 05:08 PM
Replies: 2
Views: 183
Posted By JohnDThompson

Just call me “the human paint booth.”

Just call me “the human paint booth.”
08-09-20, 04:44 PM
Replies: 23,054
Views: 2,613,725
Posted By JohnDThompson

You just have to train yourself to ignore...

You just have to train yourself to ignore everything except the ETRTO/ISO size designation: 40-622
08-09-20, 04:36 PM
Replies: 10
Views: 233
Posted By JohnDThompson

I suspect Galli used a standard bearing for that...

I suspect Galli used a standard bearing for that headset. A less acute angle would have required far more taper on the rollers to eliminate the sliding contact as the bearing rotates. The Stronglight...
08-09-20, 04:05 PM
Replies: 10
Views: 233
Posted By JohnDThompson

The tapered roller bearing unit has less inherent...

The tapered roller bearing unit has less inherent friction than the Stronglight cylindrical roller bearing units since there is no sliding contact on the tapered rollers. IMO, the slight drag of...
08-09-20, 03:37 PM
Replies: 17
Views: 201
Posted By JohnDThompson

On hubs with very large flanges and rims with...

On hubs with very large flanges and rims with relatively small radius, you will find that large-count cross patterns will result in either the nipple exiting the rim at an unacceptable angle that...
08-09-20, 03:26 PM
Replies: 25
Views: 514
Posted By JohnDThompson

Only if you're OCD enough to insist on always...

Only if you're OCD enough to insist on always following a strict, linear progression. I don't, anymore. If I need a little change, I shift the rear derailleur. If I need a bigger change, I shift the...
08-09-20, 07:23 AM
Replies: 13
Views: 459
Posted By JohnDThompson

A couple oldies:

A couple oldies:
08-09-20, 07:13 AM
Replies: 37
Views: 692
Posted By JohnDThompson

Actually, UltraGlide® was the name of the...

Actually, UltraGlide® was the name of the original, plastic-lined cable housing and teflon-coated cables that came out in the late 70s. I still have a set on one of my bikes.
08-09-20, 07:06 AM
Replies: 10
Views: 264
Posted By JohnDThompson

If you've tried several, known true, properly...

If you've tried several, known true, properly dished wheels and they all land the same way, then it is most likely a frame issue. Is the wheel centered between the seat stays, or is it off-center...
08-08-20, 10:14 AM
Replies: 6,480
Views: 575,076
Posted By JohnDThompson

Gipiemme brake bridges. No current plans for...

Gipiemme brake bridges. No current plans for them; the price was too good to pass up:
08-08-20, 09:19 AM
Replies: 7
Views: 193
Posted By JohnDThompson

A big adjustable wrench will loosen the locknut....

A big adjustable wrench will loosen the locknut. Be aware that it is a left-hand thread, so clockwise to loosen. Same with the cone. And if you're doing an overhaul (remove crank, clean out old...
08-08-20, 08:51 AM
Replies: 21
Views: 523
Posted By JohnDThompson

Back in the early 80s, Trek used a wheel building...

Back in the early 80s, Trek used a wheel building robot from Holland Mechanics. The robot needed to be fed wheels that had been manually laced, and then it tensioned the spokes. The wheels were...
08-07-20, 07:21 PM
Replies: 22
Views: 519
Posted By JohnDThompson

FWIW, Sutherland's (4th edition) shows the...

FWIW, Sutherland's (4th edition) shows the Campagnolo taper as slightly shorter than ISO:
08-07-20, 07:11 PM
Replies: 3,011
Views: 261,766
Posted By JohnDThompson

Not sure if this will help, but I used the...

Not sure if this will help, but I used the straddle cable anchor bolt from a set of MAFAC "Racer" brakes for that purpose on my similar Maillard drum brake hubs:
08-07-20, 06:50 PM
Replies: 22
Views: 412
Posted By JohnDThompson

+1 this. Having worked as the warranty return...

+1 this. Having worked as the warranty return inspector for Trek BITD, I can say that dealing with failed product is as much public relations as it is following the letter of the warranty policy.
08-07-20, 06:58 AM
Replies: 10
Views: 336
Posted By JohnDThompson

Perhaps this can help: ...

Perhaps this can help:

https://www.sheldonbrown.com/free-k7.html

tl;dr version: freewheels are old technology, and not as strong or reliable as a freehub/cassette system when the number of...
08-06-20, 05:34 PM
Replies: 6
Views: 239
Posted By JohnDThompson

Probably your best source for 1" x 26tpi headset...

Probably your best source for 1" x 26tpi headset parts is a derelict Raleigh 3-speed. Is your Rudge completely lacking a headset, or do you have a headset you feel needs replacing? If you have a...
08-06-20, 10:18 AM
Replies: 13
Views: 352
Posted By JohnDThompson

balindamood has the official SunTour TA-260 tool...

balindamood has the official SunTour TA-260 tool for those hubs. The hubs have sealed cartridge bearings; the aluminum pieces with the notches just set the preload on the cartridges. If the hubs are...
08-06-20, 08:01 AM
Replies: 26
Views: 541
Posted By JohnDThompson

You can get permethrin fabric treatment that...

You can get permethrin fabric treatment that persists through several machine washings:
08-06-20, 07:48 AM
Replies: 53
Views: 1,687
Posted By JohnDThompson

Agreed, it's a very nice pedal, superior in many...

Agreed, it's a very nice pedal, superior in many ways to the Lyotard mod. 23 that inspired the design. But it doesn't work with slotted cleats, and that's a show-stopper for me.
08-05-20, 05:51 PM
Replies: 53
Views: 1,687
Posted By JohnDThompson

My experience is that MKS pedals tend to ship...

My experience is that MKS pedals tend to ship with the bearing adjusted on the tight side. Loosen the cone a smidge and they'll be fine.

N.B. the dustcap takes the same wrench as Campagnolo,...
08-05-20, 07:23 AM
Replies: 46
Views: 1,058
Posted By JohnDThompson

There were at least three models of Shimano...

There were at least three models of Shimano pedals that used the proprietary 3-bolt toeclip. "105" pedals had a plastic end cap with standard cup and cone bearings. "600" pedals also used cup and...
08-05-20, 07:12 AM
Replies: 19
Views: 400
Posted By JohnDThompson

In principle, friction shifting will work with...

In principle, friction shifting will work with any number of sprockets on the rear cluster; you just need more finesse the more sprockets you have.

In practice, some shift levers may not have...
08-05-20, 06:47 AM
Replies: 16
Views: 409
Posted By JohnDThompson

If you have a 1/8" chain with pinned links, such...

If you have a 1/8" chain with pinned links, such as found on most single-speed and internally geared drivetrains, no problem.

If you have a modern, riveted 3/32" chain, such as used on...
08-04-20, 06:49 PM
Replies: 46
Views: 1,058
Posted By JohnDThompson

OP said he is running Shimano PD-7400 pedals,...

OP said he is running Shimano PD-7400 pedals, which are somewhat unique. But they do have a tab quite similar to the one on Campagnolo pedals.

VeloBase.com - Component: Shimano PD-7400, Dura-Ace...
08-04-20, 05:42 PM
Replies: 12
Views: 327
Posted By JohnDThompson

1/8" chains used on single-speed and bikes with...

1/8" chains used on single-speed and bikes with internally geared hubs often used clip-type master links, but that type of master link wouldn't always pass through the pulley cage of a derailleur...
08-04-20, 08:34 AM
Replies: 28
Views: 903
Posted By JohnDThompson

This is a chain holder to put some tension on the...

This is a chain holder to put some tension on the chain when the rear wheel is out. Helps prevent paint damage, etc.



Dummy brake levers for the stoker handlebars on a tandem. Gives the stoker...
08-04-20, 07:59 AM
Replies: 12
Views: 327
Posted By JohnDThompson

Chains from that era were pinned, not riveted,...

Chains from that era were pinned, not riveted, and no master link was used because the pins could reliably re-close the chain. As the number of sprockets on the rear cluster increased beyond seven,...
08-03-20, 06:28 PM
Replies: 17
Views: 354
Posted By JohnDThompson

While it is not difficult to re-space the frame...

While it is not difficult to re-space the frame to accommodate a wider hub, 8-sprocket freewheels are more prone to axle breakage than 6-sprocket freewheels, and on a tandem this could be a...
Forum: Road Cycling
08-03-20, 11:15 AM
Replies: 5
Views: 320
Posted By JohnDThompson

“Michael Jackson was here.”

“Michael Jackson was here.”
08-03-20, 10:21 AM
Replies: 46
Views: 1,058
Posted By JohnDThompson

Shimano did offer a proprietary cleat for that...

Shimano did offer a proprietary cleat for that style pedal/clip, but they work fine with regular slotted cleats as well. Ex Pres has a nice picture of the Shimano cleat in the "For Sale" section:
...
08-03-20, 10:06 AM
Replies: 19,386
Views: 3,168,019
Posted By JohnDThompson

That's how you get the fashionable saddle/stem...

That's how you get the fashionable saddle/stem drop with a frame that's almost too big for you.
08-03-20, 10:02 AM
Replies: 40
Views: 899
Posted By JohnDThompson

I put these on my fixed gear bike. Campagnolo...

I put these on my fixed gear bike. Campagnolo Pista hubs, Arc-en-Ciel rims:
08-03-20, 07:42 AM
Replies: 8
Views: 214
Posted By JohnDThompson

Screw a steel threaded cup down below where you...

Screw a steel threaded cup down below where you intend to trim the steer tube. Un-threading the cup after cutting the tube will chase the threads. Don't use an aluminum threaded cup for this; it's...
08-03-20, 07:35 AM
Replies: 8
Views: 214
Posted By JohnDThompson

Fork blades must be appropriately long for...

Fork blades must be appropriately long for whatever wheel you intend to use. Brake mount(s) must allow whatever brake you intend to use function properly. Rake (offset) should be close to that of the...
08-02-20, 02:33 PM
Replies: 89
Views: 3,622
Posted By JohnDThompson

I've carried a frame pump (Silca Impero with...

I've carried a frame pump (Silca Impero with Campagnolo head) for so long, I feel naked riding without it. :)



Like I said, I've yet to even try the CO2, so I don't know how full it will get...
08-02-20, 02:17 PM
Replies: 19
Views: 470
Posted By JohnDThompson

For the assembly line at Trek, we had bulk...

For the assembly line at Trek, we had bulk bearing greasers for bottom bracket and headset bearing retainers. The retainers were slipped over a steel rod, a pipe fitted over the retainers and rod,...
08-02-20, 02:12 PM
Replies: 11
Views: 191
Posted By JohnDThompson

IIRC, Tange made the Shimano-branded cartridges.

IIRC, Tange made the Shimano-branded cartridges.
08-02-20, 02:08 PM
Replies: 7
Views: 451
Posted By JohnDThompson

I use the hexagonal ones as low-profile nuts on...

I use the hexagonal ones as low-profile nuts on mudguard darumas. It never hurts to have as much clearance as possible.

https://i.ebayimg.com/images/g/3-8AAOSw42dZMT6G/s-l400.jpg
08-02-20, 01:56 PM
Replies: 89
Views: 3,622
Posted By JohnDThompson

I've always carried a frame pump, but the latest...

I've always carried a frame pump, but the latest flat convinced me that the arthritis in my hands and shoulders makes that inadequate. I got up to about 60psi when the hands and shoulders told me...
08-02-20, 01:45 PM
Replies: 27
Views: 845
Posted By JohnDThompson

Some bike shops have "test saddles" you can use...

Some bike shops have "test saddles" you can use to help decide which saddle works best. You put a nominal deposit down, install the test saddle on your bike, ride for some arbitrary period (days,...
08-02-20, 01:42 PM
Replies: 17
Views: 420
Posted By JohnDThompson

I have significant arthritis in my neck, and...

I have significant arthritis in my neck, and riding in the drops for extended periods was not comfortable. I found that changing the stem to raise the handlebars helped a lot. Perhaps I sacrificed...
07-31-20, 08:38 PM
Replies: 8
Views: 249
Posted By JohnDThompson

No, the spindle isn't the cause; it's caused by...

No, the spindle isn't the cause; it's caused by riding with the arm not securely fastened to the spindle. When you install the new arm, make sure it is properly torqued to the spindle, and check it...
07-31-20, 08:27 PM
Replies: 10
Views: 435
Posted By JohnDThompson

I've always associated saddle sag with leather...

I've always associated saddle sag with leather sling-type saddles and over-zealous treatment with leather conditioning products, not plastic-based saddles. Are you perhaps heavier than what the...
07-31-20, 11:29 AM
Replies: 13
Views: 292
Posted By JohnDThompson

First, check the alignment to ensure that the...

First, check the alignment to ensure that the blades are equally offset and the dropout centerline is coaxial with the steer tube centerline. This is hard to do without a gauge of some sort, like the...
Showing results 1 to 50 of 1000
 


 
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