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Search: Posts Made By: WizardOfBoz
Showing results 1 to 50 of 244
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Forum: Bicycle Mechanics
04-01-24, 07:08 AM
Replies: 3
Views: 205
Posted By WizardOfBoz

Ummm. The stock pinch bolts are pretty cheap. ...

Ummm. The stock pinch bolts are pretty cheap. Depending on the class (Dura Ace, Ultegra...) the stock bolts are titanium. Pretty strong, and light.

Why are you going through the effort of...
Forum: Bicycle Mechanics
02-19-24, 07:38 AM
Replies: 13
Views: 848
Posted By WizardOfBoz

Geez, I've just been doing my commute every day. ...

Geez, I've just been doing my commute every day. I have no idea how all that rust happened.......
Forum: Bicycle Mechanics
02-02-24, 07:45 PM
Replies: 25
Views: 1,230
Posted By WizardOfBoz

There's a first time for everything, Andrew. You...

There's a first time for everything, Andrew. You made my night!
Forum: Bicycle Mechanics
02-02-24, 02:10 PM
Replies: 25
Views: 1,230
Posted By WizardOfBoz

As noted above your fork may already be dead and...

As noted above your fork may already be dead and you just don't know it. That said, if you don't know how to say "This is messed up, I'm not taking any chance and am buying a new fork" you could try...
Forum: Bicycle Mechanics
02-01-24, 08:01 AM
Replies: 25
Views: 1,156
Posted By WizardOfBoz

Ah, yeah, that's it. I had a brain fart. Use...

Ah, yeah, that's it. I had a brain fart. Use ATF/Acetone 50/50. Thanks Cranky.
Forum: Bicycle Mechanics
01-13-24, 09:21 AM
Replies: 48
Views: 2,140
Posted By WizardOfBoz

In re: suggestions to use SS or Ti screws. ...

In re: suggestions to use SS or Ti screws. Depending on the female thread material, one could get galling. To minimize problems I would use a good quality hardened and plated steel hex screw, with...
Forum: Bicycle Mechanics
12-21-23, 12:36 PM
Replies: 37
Views: 1,436
Posted By WizardOfBoz

Yes! All you need is ten 42lb bags of flour,...

Yes! All you need is ten 42lb bags of flour, ....., a custom 600 quart bowl, and about 420 baking pans and a VERY large oven. Plus the rewired electric service...

BTW, your strategy is a good...
Forum: Bicycle Mechanics
12-19-23, 07:27 AM
Replies: 37
Views: 1,436
Posted By WizardOfBoz

I want one too, but putting in a three phase 575V...

I want one too, but putting in a three phase 575V 60 amp service is a big discouragement.
Forum: Bicycle Mechanics
12-18-23, 02:38 PM
Replies: 37
Views: 1,436
Posted By WizardOfBoz

I think a mill (or milling machine) is called the...

I think a mill (or milling machine) is called the same in the UK. It's like a drill press on steroids. Very rigid. Has a table underneath the chuck that holds a tool (an endmill, a facing mill...
Forum: Bicycle Mechanics
12-18-23, 07:19 AM
Replies: 37
Views: 1,436
Posted By WizardOfBoz

In machine shop work, the first step after Kroil...

In machine shop work, the first step after Kroil or PB Blaster is usually heat, using a rosebud tip an an oxyacetylene torch. Here, you could use a home depot propane tank and torch tip. But one...
Forum: Bicycle Mechanics
12-07-23, 10:38 AM
Replies: 32
Views: 1,304
Posted By WizardOfBoz

If you can recognize the model number and year...

If you can recognize the model number and year (from the serial number), you sometimes can find the spec in old advertisements and catalogs.
There is a technical way to identify alloy composition...
Forum: Bicycle Mechanics
11-30-23, 10:09 AM
Replies: 43
Views: 1,635
Posted By WizardOfBoz

From a liability standpoint, if the stem is...

From a liability standpoint, if the stem is deformed ("plastic deformation") then I wouldn't recommend it.

But if I could get a shim in there so that the clamp did not completly close, I'd...
Forum: Bicycle Mechanics
11-21-23, 07:22 AM
Replies: 14
Views: 711
Posted By WizardOfBoz

Thanks, maddog. Gee, I remember when it was...

Thanks, maddog.
Gee, I remember when it was 25.399 or some such. But the really hard change was when we gave up on cubits....
Forum: Bicycle Mechanics
10-01-23, 10:39 AM
Replies: 17
Views: 909
Posted By WizardOfBoz

Thanks, Mark. I owe any knowledge in the area to...

Thanks, Mark. I owe any knowledge in the area to a dated reference: "Carroll Smith's Nuts, Bolts, Fasteners and Plumbing Handbook", published 1990. Appreciate the update.
Forum: Bicycle Mechanics
09-12-23, 05:51 AM
Replies: 36
Views: 14,183
Posted By WizardOfBoz

I think that you’re correct, but if you have a cf...

I think that you’re correct, but if you have a cf bike, epoxy is what’s holding your frame together. 100° C Is pretty hot, so if I was going the thermal route I’d use wax as suggested above. For my...
Forum: Bicycle Mechanics
09-05-23, 06:16 AM
Replies: 8
Views: 636
Posted By WizardOfBoz

Yeah, I can second TiHabanero's point. No fun...

Yeah, I can second TiHabanero's point. No fun when the tire rolls off the rim, sticks in the brake, and you go over the handlebars. Spitting out parts of 13 teeth, and having the doc scrape the dirt...
Forum: Bicycle Mechanics
08-20-23, 08:42 AM
Replies: 86
Views: 6,047
Posted By WizardOfBoz

Mark, this is interesting. Karl Pearson, the...

Mark, this is interesting. Karl Pearson, the statistician, held this view. Hence the inviolable catechism: "Data shows correlation, not causation". Which is tacitly ignored by anyone who actually...
Forum: Bicycle Mechanics
08-03-23, 08:00 AM
Replies: 36
Views: 1,994
Posted By WizardOfBoz

Everyone else is wrong. The best (and only!) way...

Everyone else is wrong. The best (and only!) way to lubricate loose balls is using grease extracted from the musk glands from polka-dotted (no other!) ferrets. The best of this type of grease is...
Forum: Bicycle Mechanics
07-22-23, 08:41 AM
Replies: 19
Views: 9,354
Posted By WizardOfBoz

Ok, I'm an engineer. I suggest being careful...

Ok, I'm an engineer. I suggest being careful about this. The original seat post was designed to accommodate a maximum lever arm. Extending the post adds to the lever arm. This could put a higher than...
Forum: Bicycle Mechanics
07-10-23, 01:28 PM
Replies: 24
Views: 1,276
Posted By WizardOfBoz

Tire tool I think.

Tire tool I think.
Forum: Bicycle Mechanics
06-07-23, 06:00 AM
Replies: 14
Views: 682
Posted By WizardOfBoz

If you use the same minimum insertion distance...

If you use the same minimum insertion distance from where you cut off to your new "min insertion depth", and the rest of the post is ok, your modded post should be ok. I'm basing this on 1) The same...
Forum: Bicycle Mechanics
05-21-23, 08:36 PM
Replies: 26
Views: 1,032
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
03-17-23, 12:00 PM
Replies: 12
Views: 529
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: 1,801
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
12-04-22, 05:05 PM
Replies: 73
Views: 3,365
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
11-21-22, 07:49 AM
Replies: 66
Views: 2,520
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
09-23-22, 06:42 AM
Replies: 14
Views: 551
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: 4,394
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: 4,394
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: 4,394
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
08-15-22, 06:01 AM
Replies: 20
Views: 701
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
07-17-22, 06:27 PM
Replies: 14
Views: 429
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, 12:05 PM
Replies: 14
Views: 429
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, 09:45 AM
Replies: 8
Views: 506
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,...
Forum: Bicycle Mechanics
07-15-22, 08:48 PM
Replies: 8
Views: 506
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...
Forum: Bicycle Mechanics
07-05-22, 05:29 AM
Replies: 17
Views: 787
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...
Forum: Bicycle Mechanics
06-23-22, 04:34 PM
Replies: 36
Views: 1,475
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.
...
Forum: Bicycle Mechanics
06-21-22, 09:12 PM
Replies: 7
Views: 376
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...
Forum: Bicycle Mechanics
02-21-22, 09:55 PM
Replies: 21
Views: 993
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"...
Forum: Bicycle Mechanics
01-31-22, 08:13 PM
Replies: 5
Views: 903
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.
Forum: Bicycle Mechanics
01-21-22, 11:21 AM
Replies: 12
Views: 2,115
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...
Forum: Bicycle Mechanics
01-15-22, 10:57 AM
Replies: 7
Views: 356
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....
Forum: Bicycle Mechanics
12-16-21, 05:53 AM
Replies: 43
Views: 2,155
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)...
Forum: Bicycle Mechanics
10-31-21, 10:20 AM
Replies: 24
Views: 1,387
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...
Forum: Bicycle Mechanics
10-16-21, 01:59 PM
Replies: 20
Views: 586
Posted By WizardOfBoz

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

Oh... You're talking about the bike.
Forum: Bicycle Mechanics
10-16-21, 01:08 PM
Replies: 20
Views: 7,371
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...
Forum: Bicycle Mechanics
09-29-21, 08:38 PM
Replies: 11
Views: 872
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?
Forum: Bicycle Mechanics
09-23-21, 12:55 PM
Replies: 84
Views: 6,018
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...
Forum: Bicycle Mechanics
09-19-21, 04:24 PM
Replies: 20
Views: 2,251
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
Forum: Bicycle Mechanics
08-22-21, 07:47 PM
Replies: 17
Views: 3,109
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...
Showing results 1 to 50 of 244
 
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