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Search: Posts Made By: WizardOfBoz
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-24-23, 06:29 AM
Replies: 5
Views: 555
Posted By WizardOfBoz

Paint remover shouldn't affect good chrome. But...

Paint remover shouldn't affect good chrome. But you could do a trial patch somewhere not obvious to ensure that this is true.

A true quality chrome frame is polished like heck, then plated with...
Forum: Bicycle Mechanics
05-22-23, 07:36 PM
Replies: 26
Views: 588
Posted By WizardOfBoz

Despite the discourse above, I agree with Maddog....

Despite the discourse above, I agree with Maddog. Give it a try. The Schwinn Approved Le Tour GT400 is a 5 speed derailleur, so it may not span your freewheel (5 speed span is 24mm, 6 speed span...
Forum: Bicycle Mechanics
05-22-23, 03:57 PM
Replies: 26
Views: 588
Posted By WizardOfBoz

Ok, that's a 6 speed cog. If this is the original...

Ok, that's a 6 speed cog. If this is the original freewheel then this World Sport is from 84 to 89 (prior to 84 the freewheels were 5 speed, and in 90 it was seven speed). The pic does not match...
Forum: Bicycle Mechanics
05-22-23, 03:09 PM
Replies: 26
Views: 588
Posted By WizardOfBoz

Oh, thank goodness.

Oh, thank goodness.
Forum: Bicycle Mechanics
05-22-23, 01:28 PM
Replies: 26
Views: 588
Posted By WizardOfBoz

Ignorance is best served by reticence to speak or...

Ignorance is best served by reticence to speak or write.

In building radios, oscilloscopes, and guitar amplifiers I learned that it is critical to heat a joint to be soldered and let the joint...
Forum: General Cycling Discussion
05-22-23, 07:50 AM
Replies: 34
Views: 711
Posted By WizardOfBoz

"Go away bear" and a black bear that understands...

"Go away bear" and a black bear that understands English is a fortunate occurrence. The 30-06 would seem to be a a good round for insurance purposes. For those that don't shoot, the 30-06 was the...
Forum: Bicycle Mechanics
05-22-23, 06:54 AM
Replies: 26
Views: 588
Posted By WizardOfBoz

maddog34 you have more (way more) experience...

maddog34 you have more (way more) experience welding, brazing and soldering than me and probably than 99.99% of the folks on this forum. Which makes your use of the incorrect term "fillet weld"...
Forum: Bicycle Mechanics
05-21-23, 08:36 PM
Replies: 26
Views: 588
Posted By WizardOfBoz

Maddog, the outward appearance you mentioned - of...

Maddog, the outward appearance you mentioned - of a "fillet weld" has more complexity than one can see in the joint.

[boring pedantic lecture]

In the early days of bicycles, the tubes were...
Forum: Bicycle Mechanics
05-20-23, 09:33 PM
Replies: 49
Views: 641
Posted By WizardOfBoz

It should be easy to measure the distance from...

It should be easy to measure the distance from centerline to each sprocket. Measure the seat tube diameter, D, with a mic or a caliper. Measure the distance from the seat tube to each chainring...
Forum: Bicycle Mechanics
05-20-23, 03:49 PM
Replies: 25
Views: 522
Posted By WizardOfBoz

I would probably try a ceramic disk on a Dremel...

I would probably try a ceramic disk on a Dremel tool to cut the bolt in the crack of the arm. There's a little plastic thingie in there that you'll likely destroy and will have to replace. The...
Forum: Bicycle Mechanics
05-18-23, 06:27 AM
Replies: 20
Views: 363
Posted By WizardOfBoz

For some bottom bracket formats, for example...

For some bottom bracket formats, for example Trek's BB90/95, you are supposed to put grease in the bearing seat before installation to prevent creaking and wear. I used a PTFE (Teflon(R) actually)...
Forum: Bicycle Mechanics
05-11-23, 10:22 AM
Replies: 107
Views: 2,804
Posted By WizardOfBoz

Kind of agree with smd4. If you are in an...

Kind of agree with smd4. If you are in an airplane, knowing that the left wing will fall off first is not operationally actionable. The seat tube is an integral part of a system (the diamond frame)...
Forum: Bicycle Mechanics
05-10-23, 08:00 PM
Replies: 107
Views: 2,804
Posted By WizardOfBoz

Any person who is a master welder will refuse to...

Any person who is a master welder will refuse to even try to weld this. And any person that agrees to weld this is not a master welder.


And yet... it broke. There was enough stress to break the...
Forum: Bicycle Mechanics
04-05-23, 08:02 AM
Replies: 20
Views: 637
Posted By WizardOfBoz

Works great - make sure that the tool is totally...

Works great - make sure that the tool is totally immersed though. If a section is sticking out it leaves a black ring at that point. Not anything functionally bad, its just that if you put money and...
Forum: Bicycle Mechanics
04-02-23, 09:43 AM
Replies: 8
Views: 325
Posted By WizardOfBoz

Agree - the automotive solution is a mild cutting...

Agree - the automotive solution is a mild cutting polish like the meguiar products, and a lot of elbow grease. Clean thoroughly (a pack of microfiber clothes from Harbor Freight is useful here) and...
Forum: Bicycle Mechanics
03-31-23, 02:07 PM
Replies: 20
Views: 637
Posted By WizardOfBoz

The 80s Urban Express had a pretty good spec...

The 80s Urban Express had a pretty good spec sheet. Chrome-moly frame, Chrome manganese fork, mostly alloy accessories.

BTW, Evaporust is your friend here for tools at least. Good luck.
Forum: Bicycle Mechanics
03-29-23, 06:34 AM
Replies: 16
Views: 1,115
Posted By WizardOfBoz

btw ...

btw
https://cimg3.ibsrv.net/gimg/bikeforums.net-vbulletin/800x600/ultegrabr6600_8763eb328f0463417c93aea97e50301a433a1f19.jpg
Forum: Bicycle Mechanics
03-17-23, 12:00 PM
Replies: 12
Views: 431
Posted By WizardOfBoz

I use goo-gone, which is a product containing a...

I use goo-gone, which is a product containing a solvent from citrus fruit (d-limonene). I've found this to be much better than anything else I've tried (propanol, OMS, gasoline) for getting sticky...
Forum: Bicycle Mechanics
02-23-23, 12:15 PM
Replies: 39
Views: 1,283
Posted By WizardOfBoz

Yup. Here's a video about how these were...

Yup.

Here's a video about how these were made (a modern babbit pour in an old machine):
https://www.youtube.com/watch?v=g_zmuB2upmY
Forum: Bicycle Mechanics
02-21-23, 06:51 AM
Replies: 39
Views: 1,283
Posted By WizardOfBoz

They could be brass after all: just most of my...

They could be brass after all: just most of my sources stated Babbit. Babbit can be recast in place, and also can absorb impurities.

A lot of heavy duty lathes and other machine tools were made...
Forum: Bicycle Mechanics
02-18-23, 09:44 AM
Replies: 39
Views: 1,283
Posted By WizardOfBoz

Brass may be correct but I suspect that the...

Brass may be correct but I suspect that the bearings were babbit metal or bronze. Brass can be a good bearing metal with steel but it's more prone to corrosion (brass contains zinc, bronze contains...
Forum: Bicycle Mechanics
02-18-23, 09:28 AM
Replies: 39
Views: 1,283
Posted By WizardOfBoz

I'm not sure that low friction bearings were used...

I'm not sure that low friction bearings were used in all hubs in early bicycles. There's a book (if i can remember or find it I'll report back) by a really interesting guy who became a machinist in...
Forum: Bicycle Mechanics
02-12-23, 10:32 PM
Replies: 22
Views: 711
Posted By WizardOfBoz

Couldn't see the pic, but one other thing:...

Couldn't see the pic, but one other thing: Injection molded parts are generally going to be stronger than 3D printed parts.
Forum: Bicycle Mechanics
02-12-23, 12:29 PM
Replies: 22
Views: 711
Posted By WizardOfBoz

The other thing is , in asking for dimensional...

The other thing is , in asking for dimensional drawings, that Simplex seemed to tweak designs every few months. So in asking for the drawing for a mid-60s FD made of HOM/Acetal, one would have to...
Forum: Bicycle Mechanics
02-11-23, 11:34 AM
Replies: 22
Views: 711
Posted By WizardOfBoz

Andy, Given the Russian's exceptionally fluid...

Andy, Given the Russian's exceptionally fluid regard for the ethics of chemical additives, one wonders what was in that yak butter....

But dsbrandtjr is correct. I used to work at the DuPont plant...
Forum: Bicycle Mechanics
02-04-23, 10:59 AM
Replies: 23
Views: 564
Posted By WizardOfBoz

So the current brake lever has a recess for the...

So the current brake lever has a recess for the head of the bolt. Probably a socket head (allen wrench) bolt. If one wants to reverse directions of the bolt and nut so that a nut goes into the...
Forum: Bicycle Mechanics
02-04-23, 10:09 AM
Replies: 23
Views: 564
Posted By WizardOfBoz

Ummm. To paraphrase Pascal, "The heart has its...

Ummm. To paraphrase Pascal, "The heart has its reasons that know no reason?"

If you wanted this to work I think you could use a nut with a shoulder if you had a long enough bolt. Picture below. ...
Forum: Bicycle Mechanics
12-04-22, 05:05 PM
Replies: 76
Views: 2,173
Posted By WizardOfBoz

Well, I was assuming a little laxity in the OP's...

Well, I was assuming a little laxity in the OP's description. But a bent QR is often correlated with a broken axle.
Forum: Bicycle Mechanics
12-04-22, 02:17 PM
Replies: 76
Views: 2,173
Posted By WizardOfBoz

Uh, yeah. If the skewer is bent then I'd be...

Uh, yeah. If the skewer is bent then I'd be suspicious of a broken axle. Which would lead to play.
Forum: Bicycle Mechanics
12-03-22, 12:29 AM
Replies: 29
Views: 1,425
Posted By WizardOfBoz

Metal laminate? You can make a laminate with...

Metal laminate? You can make a laminate with metal but it's kind of unusual. Usually "metal laminate" is formica that is surfaced to look like metal. You can buy benches made of 12 gauge stainless...
Forum: Bicycle Mechanics
11-22-22, 07:08 AM
Replies: 67
Views: 1,497
Posted By WizardOfBoz

In the movie, ZOWIE was an acronym similar to...

In the movie, ZOWIE was an acronym similar to U.N.C.L.E., C.H.A.O.S, etc. Zonal Organization for World IntElligence. The good guys in the movie.
Forum: Bicycle Mechanics
11-22-22, 06:43 AM
Replies: 67
Views: 1,497
Posted By WizardOfBoz

Ah, I completely missed that! Errol was before...

Ah, I completely missed that! Errol was before my time - I'm much more in the Coburn time frame myself. "In Like Flint". 1967. In which Z.O.W.I.E. is discredited and our heros defeat the evil...
Forum: Bicycle Mechanics
11-21-22, 07:49 AM
Replies: 67
Views: 1,497
Posted By WizardOfBoz

FBinNY, your answers are super helpful and I...

FBinNY, your answers are super helpful and I appreciate your posts. That said, "in like Flint" hits me right in the OCD.

It's "In like Flynn". The phrase ‘In Like Flynn’ means that you have...
Forum: Bicycle Mechanics
11-05-22, 12:01 PM
Replies: 68
Views: 1,571
Posted By WizardOfBoz

Agree. Steel, even fairly weak steel, has an...

Agree. Steel, even fairly weak steel, has an ultimate tensile strength of about 60,000 psi. JB Weld claims a tensile strength of about 4000 psi. Your axle, which is steel, already broke even with...
Forum: Bicycle Mechanics
09-23-22, 06:42 AM
Replies: 14
Views: 372
Posted By WizardOfBoz

Standard size steerer tubes are 1" and 1-1/8". As...

Standard size steerer tubes are 1" and 1-1/8". As others have said you have to take the fork out to expose the steerer tube. Holding a ruler up to a round tube to measure diameter is a poor method....
Forum: Bicycle Mechanics
09-12-22, 06:00 AM
Replies: 112
Views: 2,535
Posted By WizardOfBoz

The cited paper, above, notes how as you...

The cited paper, above, notes how as you overtighten spokes, the wheel becomes metastable. That is it remains round and flat unless there's a bit of a disturbance. This might be a lateral force or...
Forum: Bicycle Mechanics
09-09-22, 01:31 PM
Replies: 112
Views: 2,535
Posted By WizardOfBoz

Yan, my late father in law was trained in...

Yan, my late father in law was trained in physics. Smartest guy I ever met. He mentioned to me that bicycle dynamics is REALLY hard to analyze. Since you are interested:

Here is a Scientific...
Forum: Bicycle Mechanics
09-09-22, 12:28 PM
Replies: 112
Views: 2,535
Posted By WizardOfBoz

There can be lateral forces on a wheel. You can...

There can be lateral forces on a wheel. You can generate them easily. On your bike, going in a straight line, cant your bike to the left while balancing by shifting your weight to the right. The...
Forum: Bicycle Mechanics
09-08-22, 06:54 AM
Replies: 112
Views: 2,535
Posted By WizardOfBoz

One can cant one's bike over to one side and lean...

One can cant one's bike over to one side and lean the other way and balance when going straight, thereby putting a strong lateral force on the wheel. Try it - its easy to do. In the same way, this...
Forum: Bicycle Mechanics
08-30-22, 06:52 AM
Replies: 23
Views: 598
Posted By WizardOfBoz

Well, first, yes. Of course you can. Motor oil...

Well, first, yes. Of course you can. Motor oil is very high quality and won't break down. But it may not your best option. I'm extrapolating from machine tools but...

Motor oil has detergents...
Forum: Bicycle Mechanics
08-30-22, 06:43 AM
Replies: 50
Views: 1,349
Posted By WizardOfBoz

If you can get a replacement frame, cheap, and...

If you can get a replacement frame, cheap, and swap components that may be your best alternative. But the fact that you had the seatpost up so high suggests that the frame was mis-sized in the first...
Forum: Bicycle Mechanics
08-15-22, 07:49 PM
Replies: 20
Views: 489
Posted By WizardOfBoz

That is weird that you didn't see it. I look at...

That is weird that you didn't see it. I look at any element of the tire that has a constant diameter and depressure if I see even a slight lack of concentricity. That said, If the thing starts...
Forum: Bicycle Mechanics
08-15-22, 06:01 AM
Replies: 20
Views: 489
Posted By WizardOfBoz

This. The tube didn't pop, sending the tire off...

This. The tube didn't pop, sending the tire off the rim. The tire slid off the rim, allowing the tire to balloon out and pop. I only have about 8 years of experience working in a bike shop, many...
Forum: Bicycle Mechanics
07-31-22, 08:55 AM
Replies: 46
Views: 1,817
Posted By WizardOfBoz

Ok, I'm not liking this design any more. You want...

Ok, I'm not liking this design any more. You want a setup that will be strong and rigid. Strength and rigidity are based upon mechanical design and material of construction. This design essentially...
Forum: Bicycle Mechanics
07-28-22, 01:10 PM
Replies: 46
Views: 1,817
Posted By WizardOfBoz

I really like the idea of using the tube...

I really like the idea of using the tube extender. If you had a steel steerer and a steel extender, you could actually weld it and then grind it. Lower weight.

As for having a free-floating...
Forum: Bicycle Mechanics
07-18-22, 08:29 AM
Replies: 8
Views: 418
Posted By WizardOfBoz

Be glad you can do that. My spouse is a physical...

Be glad you can do that. My spouse is a physical therapist. There is a wave of long-covid people coming. It's not "just like a mild flu", but for vaccinated people it seems that its much more mild....
Forum: Bicycle Mechanics
07-17-22, 06:27 PM
Replies: 14
Views: 372
Posted By WizardOfBoz

At least you spent your time productively. ...

At least you spent your time productively.

I'd say that that fork is toast. Both Al and Mg are bad for cold forming. The metal is weakened in that area and bending it back will weaken it...
Forum: Bicycle Mechanics
07-17-22, 02:58 PM
Replies: 14
Views: 372
Posted By WizardOfBoz

Thanks, cxwrench. I'd looked at the specs - the...

Thanks, cxwrench. I'd looked at the specs - the upper fork tubes are specified as aluminum. I guess I just assumed that the lowers would be, too.

I grew up working in a machine shop in my...
Forum: Bicycle Mechanics
07-17-22, 12:05 PM
Replies: 14
Views: 372
Posted By WizardOfBoz

By the way, I think you need 10 posts before you...

By the way, I think you need 10 posts before you can post photos, so if you wanted to you could browse the forum and post innocouus stuff like "Ooooh! That's a pretty bike!". Or whatever suits you....
Forum: Bicycle Mechanics
07-17-22, 12:04 PM
Replies: 14
Views: 372
Posted By WizardOfBoz

Your missing the point. Go to your file server -...

Your missing the point. Go to your file server - where ever on the web you've uploaded your pictures to (Google pics works). Get the url. You CAN include a URL in your posts. Make a post with the url...
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