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Search: Posts Made By: WizardOfBoz
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09-23-22, 06:42 AM
Replies: 14
Views: 267
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....
09-12-22, 06:00 AM
Replies: 77
Views: 1,360
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...
09-09-22, 01:31 PM
Replies: 77
Views: 1,360
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...
09-09-22, 12:28 PM
Replies: 77
Views: 1,360
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...
08-15-22, 06:01 AM
Replies: 20
Views: 432
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...
07-17-22, 06:27 PM
Replies: 14
Views: 358
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...
07-17-22, 12:05 PM
Replies: 14
Views: 358
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....
07-17-22, 09:45 AM
Replies: 8
Views: 392
Posted By WizardOfBoz

Yes, there is something calming about building a...

Yes, there is something calming about building a bike up from the frame. Complex enough to completely absorb your attention, but not so mindlessly complex that your brain is frazzled. Great attitude,...
07-15-22, 08:48 PM
Replies: 8
Views: 392
Posted By WizardOfBoz

Agree with Andy. The design of that stay, with...

Agree with Andy. The design of that stay, with the contact point shrunk down, seems to be a triumph of aesthetics and marketing over good engineering practices. By the time you've ground the paint...
07-05-22, 05:29 AM
Replies: 17
Views: 617
Posted By WizardOfBoz

The top of a threaded fork is not where the most...

The top of a threaded fork is not where the most stress is. Is there any corrosion where the steerer tube meets the fork body? That would concern me more? Is there a lot of rust on the inside of...
06-23-22, 04:34 PM
Replies: 36
Views: 1,088
Posted By WizardOfBoz

Agree - Many cheap cone wrenches are made of...

Agree - Many cheap cone wrenches are made of Chinesium alloy. This alloy has the hardness and wear resistance of Manchego cheese. Buy good stuff and don't encourage the b*****ds who make c**p.
...
06-21-22, 09:12 PM
Replies: 7
Views: 248
Posted By WizardOfBoz

In a machine shop the escalation involves trying...

In a machine shop the escalation involves trying to made something move, then adding penetrating oil, then soaking in penetrating oil, then using heat from a rosebud flame (obviously this shouldn't...
02-21-22, 09:55 PM
Replies: 21
Views: 678
Posted By WizardOfBoz

Paint sanded away - poorly. Welding an aluminum...

Paint sanded away - poorly. Welding an aluminum handlebar. If you know the alloy (the bar is likely 2014, 7075 or another 7000 series) you can, with proper technique, do a weld but "hot shortness"...
01-31-22, 08:13 PM
Replies: 5
Views: 321
Posted By WizardOfBoz

See the figure in section 3.1.2: ...

See the figure in section 3.1.2:

https://bike.bikegremlin.com/3246/names-bicycle-head-tube-fork-headset-parts/

This may clarify. Good luck.
01-21-22, 11:21 AM
Replies: 12
Views: 1,063
Posted By WizardOfBoz

Ah, this makes sense. Glad you got it fixed. As...

Ah, this makes sense. Glad you got it fixed. As long as you can 1) preload the bearings with the cap, and 2) have the stemp clamp on tube (and not "clamp on air") you are good. The 1-2mm of...
01-15-22, 10:57 AM
Replies: 7
Views: 233
Posted By WizardOfBoz

Yes, well, an even number for the total does make...

Yes, well, an even number for the total does make sense.

BTW, a couple tricks for disassembly are
1) Spread an old white towel over the worksurface and diassemble over the top of the towel....
12-16-21, 05:53 AM
Replies: 43
Views: 1,770
Posted By WizardOfBoz

Yup. I remember Perry O. making wheels many years...

Yup. I remember Perry O. making wheels many years back, in the Racine Cyclery. Took him maybe 15 minutes. A VAR spoke screwdriver (kind of like a Yankee screwdriver - the kind with helical grooves)...
10-31-21, 10:20 AM
Replies: 24
Views: 1,045
Posted By WizardOfBoz

Ok, I'm giving you a theoretical answer (I have a...

Ok, I'm giving you a theoretical answer (I have a PhD in Engineering, but I haven't analyzed wheelchair dynamics). The quick answer is that the toe-in may be caused by your frame flexing, or by the...
10-16-21, 01:59 PM
Replies: 20
Views: 471
Posted By WizardOfBoz

Oh... You're talking about the bike.

Oh... You're talking about the bike.
10-16-21, 01:08 PM
Replies: 20
Views: 3,329
Posted By WizardOfBoz

I weight about 245# and have been riding on the...

I weight about 245# and have been riding on the roads on 20h wheels (Botrager Race XXX, and Paradigm). I hit a pothole and the rim is a little wonky (the seam is very slighlty sprung I think). I'm...
09-29-21, 08:38 PM
Replies: 11
Views: 646
Posted By WizardOfBoz

Yup. If you want the handlebars higher, can you...

Yup. If you want the handlebars higher, can you you find a step with a steeper angle?
09-23-21, 12:55 PM
Replies: 84
Views: 4,070
Posted By WizardOfBoz

As someone who has gone over the handlebars and...

As someone who has gone over the handlebars and landed on my chin due to trying to optimize improperly (and who grew up working in a machine shop and now has a PhD in Engineering) I would suggest...
09-19-21, 04:24 PM
Replies: 20
Views: 1,239
Posted By WizardOfBoz

This was interesting, May give you an idea for...

This was interesting, May give you an idea for your fork.

https://www.youtube.com/watch?v=TtOeCtNBUwg
08-22-21, 07:47 PM
Replies: 17
Views: 1,438
Posted By WizardOfBoz

Yes, stop with the sanding discussion already. ...

Yes, stop with the sanding discussion already. Sanding will remove metal and damage carbon. Sanding will do much more damage to your fork than the normal, minimal amount of oxidation on the fork...
08-22-21, 10:27 AM
Replies: 17
Views: 1,438
Posted By WizardOfBoz

Uhhh. So pure aluminum in air forms an oxide...

Uhhh. So pure aluminum in air forms an oxide layer almost immediately. As pointed out by cycommute, this layer is a pretty strong barrier to further oxidation. Chemicals (e.g salt air near the sea...
08-15-21, 07:50 PM
Replies: 4
Views: 440
Posted By WizardOfBoz

Probably a Stronglight A6. :) You need a square...

Probably a Stronglight A6. :) You need a square taper bottom bracket.

See here (https://www.sheldonbrown.com/bbtaper.html) for an orientation about square taper. I think you want an ISO taper (not...
04-17-21, 11:06 PM
Replies: 45
Views: 1,789
Posted By WizardOfBoz

Imagine lying on a prone bike holding a spoke....

Imagine lying on a prone bike holding a spoke. You can reach out to the front wheel. You want the bike to move. Do you hold the spoke near the center of the hub and try to use the stiffness of the...
04-12-21, 07:04 PM
Replies: 19
Views: 1,939
Posted By WizardOfBoz

Just to be clear: DON'T use kerosine or mineral...

Just to be clear: DON'T use kerosine or mineral spirits in an ultrsonic cleaner. Very bad karma.
03-20-21, 08:53 AM
Replies: 19
Views: 966
Posted By WizardOfBoz

I like this kind of project. 1) You salvage...

I like this kind of project. 1) You salvage something that somebody made, 2) you have the satisfaction of learning and completing a project, and 3) you get to go riding.

I'm an engineer and...
03-14-21, 01:52 PM
Replies: 19
Views: 966
Posted By WizardOfBoz

Hold up here. You say you have a 4mm fine pitch...

Hold up here. You say you have a 4mm fine pitch screw. That's probably MF4 (with a 0.5mm* pitch, btw, in case you want to try to order one). The tapped hole that this fits into has a minor diameter...
03-04-21, 05:49 AM
Replies: 24
Views: 1,992
Posted By WizardOfBoz

Ah, sorry. BTW, do you have a line on cheap...

Ah, sorry. BTW, do you have a line on cheap oysters? Every time I lube my chain, it costs me about 40 bucks at Whole Foods...
12-29-20, 01:43 PM
Replies: 29
Views: 2,584
Posted By WizardOfBoz

dsaul, thanks - very interesting. Appreciate...

dsaul, thanks - very interesting. Appreciate your sharing directly relevant experience.
I do recall back in the day hearing that silver-soldered lugs were mega strong.
12-18-20, 07:19 PM
Replies: 30
Views: 3,126
Posted By WizardOfBoz

Not so sure I'd jump to green. In New Mexico,...

Not so sure I'd jump to green. In New Mexico, I'd always ask first: "Green or Red"?
11-18-20, 05:25 AM
Replies: 56
Views: 4,038
Posted By WizardOfBoz

The bottom bracket may be cast (although I...

The bottom bracket may be cast (although I suspect forged) but the tubes are all drawn, hydroformed, and welded. You can see the "stacks of dimes" welds at the joints.

Also, unless an Mg bike was...
11-16-20, 08:00 PM
Replies: 11
Views: 2,337
Posted By WizardOfBoz

The yield strength for Ti is generally less than...

The yield strength for Ti is generally less than half of that for steel. That is, for the same size screw, steel is much stronger. If the bike was designed and fasteners were sized assuming steel...
11-07-20, 12:45 PM
Replies: 40
Views: 3,498
Posted By WizardOfBoz

Ummmm. So the bike shop that charged 25 bucks...

Ummmm. So the bike shop that charged 25 bucks failed. So 25 bucks is too little. And you have a bike shop that charges 50 bucks that's surviving. Doesn't that kind of tell you that 50 bucks is in...
10-18-20, 09:31 AM
Replies: 21
Views: 1,451
Posted By WizardOfBoz

I have a set of Wera Hex Plus keys (traditional...

I have a set of Wera Hex Plus keys (traditional "L" shape: no T handle) that are great. PB Swiss is beyond my pay grade (the Wera price made me gulp). But the 1/4 and 3/8 inch drive short hex keys...
08-03-20, 08:37 PM
Replies: 183
Views: 19,871
Posted By WizardOfBoz

Trakhak, you may enjoy this true story. The...

Trakhak, you may enjoy this true story. The story's a bit self indulgent and a trip down memory lane - please humor me. When I was growing up, my Mom and Dad's best friends were Dorothea and Eldon S....
08-01-20, 03:17 PM
Replies: 21
Views: 1,227
Posted By WizardOfBoz

The problem is that the stamp extends into the...

The problem is that the stamp extends into the steel. If you file down far enough to get rid of the indentations, you are 1) removing any anti-rust plating, and 2) possibly significantly weakening...
07-30-20, 09:28 PM
Replies: 29
Views: 2,984
Posted By WizardOfBoz

I've used Goo Gone on a lot of things like label...

I've used Goo Gone on a lot of things like label adhesives. I'd suggest trying it. The 3m product (Citrus Based Adhesive Remover) is based on an sweet orange extract. 3m stuff is usually pretty...
07-30-20, 03:02 PM
Replies: 8
Views: 469
Posted By WizardOfBoz

You can check that length here, The Recumbent...

You can check that length here, The Recumbent Bicycle and Human Powered Vehicle Information Center (http://www.recumbents.com/wisil/misc/crank_angle.asp),
but in practice most folks can handle a...
07-28-20, 02:24 PM
Replies: 45
Views: 3,811
Posted By WizardOfBoz

Ummmm. Ok. Why did you file out more metal from...

Ummmm. Ok. Why did you file out more metal from the eyelet? Not to be a jerk, because you are trying (and didn't grow up working in a metalworking shop and a bike shop) but the next time you have the...
07-27-20, 09:03 PM
Replies: 45
Views: 3,811
Posted By WizardOfBoz

Very nice, clean install.

Very nice, clean install.
07-25-20, 11:01 AM
Replies: 26
Views: 9,623
Posted By WizardOfBoz

So, why do you inflate your tires to 110 psi? Or...

So, why do you inflate your tires to 110 psi? Or 75psi, for that matter. Here's my criteria:
1) Low enough pressure to be comfortable (if this were not the first criterion, one could ride on...
07-24-20, 07:10 AM
Replies: 45
Views: 3,811
Posted By WizardOfBoz

Stainless can gall with aluminum if the fit was...

Stainless can gall with aluminum if the fit was too tight and especially if the materials (like the SS) was of poor quality (e.g. Home Despot).

Not sure if corrosion was the cause of the initial...
07-23-20, 10:14 PM
Replies: 45
Views: 3,811
Posted By WizardOfBoz

This sounds like a classic case of galling, which...

This sounds like a classic case of galling, which happens with SS nuts and SS bolts. Or Ti nuts and Ti bolts. Galling is when similar metals cold weld to themselves under high friction. What material...
07-23-20, 07:44 AM
Replies: 23
Views: 1,853
Posted By WizardOfBoz

Hey, Phil, they don't have to be digital! One...

Hey, Phil, they don't have to be digital! One could use a dial or even an old vernier caliper, some of which were more accurate than the current ChinCom offerings at Harbor Fright.

I own an old...
07-22-20, 06:57 AM
Replies: 15
Views: 1,193
Posted By WizardOfBoz

Yes! The Overseer: ...

Yes! The Overseer:

https://cimg9.ibsrv.net/gimg/bikeforums.net-vbulletin/484x473/dorg_6313d3e2b550bd4e3854f0e54d37378b36387a9f.jpg
07-19-20, 09:26 AM
Replies: 33
Views: 8,820
Posted By WizardOfBoz

I guess every "generation" of forum members has...

I guess every "generation" of forum members has to repeat the past....

I will point out that there's a lot of trade-offs in bearings and bearing lubrication. If I were racing, maybe the very small...
07-17-20, 01:39 PM
Replies: 35
Views: 4,371
Posted By WizardOfBoz

Cool! I remember visiting the store when I was in...

Cool! I remember visiting the store when I was in school (my house was right on Lake Mendota, a short walk from the Union Terrace, and with a direct view one winter morning as below.)

Later I...
Showing results 1 to 50 of 217
 


 
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