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Search: Posts Made By: Duragrouch
Showing results 1 to 50 of 1000
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Forum: Road Cycling
06-16-24, 05:19 AM
Replies: 34
Views: 705
Posted By Duragrouch

When fiberglass (Glass Reinforced Plastic or GRP)...

When fiberglass (Glass Reinforced Plastic or GRP) was first introduced on boats, they built ocean cruisers as thick as wood, they didn't know how strong GRP was. Then they did, and GRP got ever...
Forum: Road Cycling
06-16-24, 04:15 AM
Replies: 40
Views: 1,190
Posted By Duragrouch

You must be really area-ruled.

You must be really area-ruled.
Forum: General Cycling Discussion
06-16-24, 02:42 AM
Replies: 53
Views: 2,271
Posted By Duragrouch

From wiki: But also notably:

From wiki:

But also notably:
Forum: Folding Bikes
06-16-24, 02:35 AM
Replies: 91
Views: 7,462
Posted By Duragrouch

They're cheap in southeast Asia, but cost a ton...

They're cheap in southeast Asia, but cost a ton to ship here, enough that they then exceed 1/2 the cost of a genuine Brompton, for a copy. It would have to be less than 1/3 for me to buy. I don't...
Forum: Framebuilders
06-16-24, 02:15 AM
Replies: 15
Views: 218
Posted By Duragrouch

Not a framebuilder, just an engineer. Given that...

Not a framebuilder, just an engineer. Given that the density of ice is 0.917 that of water, that bulge is significant enough (looks like more than 8-9%) that it may be from one freeze cycle, or...
Forum: Folding Bikes
06-16-24, 01:29 AM
Replies: 6
Views: 190
Posted By Duragrouch

Thank you, that helps narrow things quite a lot....

Thank you, that helps narrow things quite a lot. Not needing an ultra-compact fold like the Brompton, opens up many more options, both lower cost, and larger wheels for better ride. A 20" wheel...
Forum: Folding Bikes
06-16-24, 01:09 AM
Replies: 91
Views: 7,462
Posted By Duragrouch

Well if they were breaking left and right, I...

Well if they were breaking left and right, I think we'd hear about it. My first (steel) Dahon frame cracked due to a design flaw (which was later corrected), but also because I put more miles on it...
Forum: Bicycle Mechanics
06-15-24, 11:52 PM
Replies: 23
Views: 616
Posted By Duragrouch

Oh no, I think you misunderstand; Assuming every...

Oh no, I think you misunderstand; Assuming every bearing is the same size, within microns, if no preload, you still only load a couple bearing balls on the bottom. This is less of an issue on the...
Forum: Folding Bikes
06-15-24, 11:24 PM
Replies: 91
Views: 7,462
Posted By Duragrouch

You're right, with that weight limit, and I did...

You're right, with that weight limit, and I did notice the 36 spoke wheels, should be beefy enough. Especially when I'd add an ersatz deltech cable. The achilles heel, according to some, is potential...
Forum: Folding Bikes
06-15-24, 10:50 PM
Replies: 91
Views: 7,462
Posted By Duragrouch

It's the Bull and was on sale for $500, but it's...

It's the Bull and was on sale for $500, but it's aluminum. It comes with a front derailleur bracket, I recommended to the seller that they offer it turn-key with 2X gearing. But I was always kind of...
Forum: Folding Bikes
06-15-24, 08:14 PM
Replies: 91
Views: 7,462
Posted By Duragrouch

Update: I still haven't replaced the wheels but...

Update: I still haven't replaced the wheels but after seeing a thread where someone wore through the sidewall and the rim destructed, I went to the bike shop to see if they had calipers or a...
Forum: Folding Bikes
06-15-24, 07:48 PM
Replies: 14
Views: 354
Posted By Duragrouch

Thanks. Yeah. That's usually the case. I just...

Thanks. Yeah. That's usually the case. I just thought that with your incredible part costs, it might be different with you, but that means you must be getting fantastic prices on wheelsets too. I'm...
Forum: Folding Bikes
06-15-24, 06:56 PM
Replies: 14
Views: 354
Posted By Duragrouch

Ron, great info as usual, thanks. A couple...

Ron, great info as usual, thanks. A couple questions:

Can you economically buy hubs, spokes, and rims at equal or less cost than built wheels? I would prefer to build my own wheels and select...
Forum: Bicycle Mechanics
06-15-24, 06:38 PM
Replies: 23
Views: 616
Posted By Duragrouch

Edited above while you were writing. Brandt says...

Edited above while you were writing. Brandt says exactly what I learned from bearing manufacturers; Even if no gap, no preload means you are loading 1 or 2 bearing balls per side. Riding a mile won't...
Forum: Bicycle Mechanics
06-15-24, 06:25 PM
Replies: 23
Views: 616
Posted By Duragrouch

I agree, that will detect if bearings too tight...

I agree, that will detect if bearings too tight and binding. But not be able to tell me if slack, zero slack, and just the right amount of preload, which all spin well. The latter has been impossible...
Forum: General Cycling Discussion
06-15-24, 06:17 PM
Replies: 53
Views: 2,271
Posted By Duragrouch

+1. A uniform is by it's nature... uniform. The...

+1. A uniform is by it's nature... uniform. The same*. But I grasp Zappa's sentiment. He seemed smarter than the average rocker.

* A point I make to people who demonize every form of socialism....
Forum: Bicycle Mechanics
06-15-24, 06:05 PM
Replies: 23
Views: 616
Posted By Duragrouch

Sidebar: Not related to this specific hub. But...

Sidebar: Not related to this specific hub. But what you said above is significant; Any wheel, once inserted into the dropouts and the QR tightened (if it compresses the axle at all), you cannot feel...
Forum: Bicycle Mechanics
06-15-24, 05:41 PM
Replies: 54
Views: 1,188
Posted By Duragrouch

https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulle...

https://cimg7.ibsrv.net/gimg/bikeforums.net-vbulletin/538x717/dtmvy_837662455_c86fac050d8ae22e22e60a03f50c2228ffbc5d68.jpg

I think I see what you mean, but gosh that seems like the crimpers would...
Forum: Folding Bikes
06-15-24, 05:31 AM
Replies: 14
Views: 354
Posted By Duragrouch

Thanks. OK, 1X would make sense because not a...

Thanks. OK, 1X would make sense because not a cross near the hub flange. The one cross will still have less preload against each other. What matters for torque transmission is the angle from radial,...
Forum: Folding Bikes
06-15-24, 04:35 AM
Replies: 14
Views: 354
Posted By Duragrouch

I could see that being done. However, doing so...

I could see that being done. However, doing so means that the two spokes that cross about 1/3 of the way between the hub and rim, will not be pressing against each other hard, which is what makes...
Forum: Bicycle Mechanics
06-15-24, 02:26 AM
Replies: 8
Views: 269
Posted By Duragrouch

Yeah I deleted my post once I discovered same as...

Yeah I deleted my post once I discovered same as you, that Formula makes hubs for a lot of folks.

I have a P-38 on my keyring, used to be on my dad's keyring. He went to a retirement party once...
Forum: Touring
06-15-24, 01:39 AM
Replies: 6
Views: 383
Posted By Duragrouch

I agree with above, and will add: Have options; I...

I agree with above, and will add: Have options; I have not yet flown with my folding bike, folded it would be a bit over max girth for checked luggage; I think I would arrive plenty early at the...
Forum: Touring
06-15-24, 12:51 AM
Replies: 72
Views: 5,147
Posted By Duragrouch

Black jacket: Wear a yellow mesh vest with...

Black jacket: Wear a yellow mesh vest with reflective strips, the latter of which can wear out, so it only costs you $10 to replace. Vests which encapsulate the reflective strips in clear plastic,...
Forum: Folding Bikes
06-15-24, 12:01 AM
Replies: 14
Views: 354
Posted By Duragrouch

That's a darned good suggestion. Very satisfying,...

That's a darned good suggestion. Very satisfying, and if you take your time, the build can come out fantastic, all you need to do is take things slow. The only thing on this particular wheelbuild,...
Forum: Road Cycling
06-14-24, 10:13 PM
Replies: 34
Views: 705
Posted By Duragrouch

A good quality used bike is fully depreciated, it...

A good quality used bike is fully depreciated, it shouldn't drop much in value if still compatible with new parts, like rear dropout spacing.

Based on another thread, I think that vintage titanium...
Forum: Folding Bikes
06-14-24, 09:53 PM
Replies: 14
Views: 354
Posted By Duragrouch

There's a bike shop in my town that specializes...

There's a bike shop in my town that specializes in repair services for a IGH hubs (people commonly ship rear wheels there for service), and possibly also wheelbuilding, as they advertise drilling...
Forum: Folding Bikes
06-14-24, 09:28 PM
Replies: 6
Views: 190
Posted By Duragrouch

OP: - How often will you be folding it? This...

OP:
- How often will you be folding it? This speaks to needs of ease and speed of folding.
- How compact folding? Your Brompton is the king in that department, Helix a close second. Typical...
Forum: Bicycle Mechanics
06-14-24, 08:48 PM
Replies: 26
Views: 531
Posted By Duragrouch

(above) I agree with all, and that I don't know...

(above) I agree with all, and that I don't know of any folding bikes with carbon steerers. But, except for competition road racers, folding bikers can get more obsessed than most with weight, as it...
Forum: Mountain Biking
06-14-24, 08:27 PM
Replies: 16
Views: 501
Posted By Duragrouch

Well that's like saying that nothing in the...

Well that's like saying that nothing in the design of race cars, applies to the design of passenger cars and trucks. And yet, Race Car Vehicle Dynamics by Bill and Doug Milliken, is the most widely...
Forum: General Cycling Discussion
06-14-24, 07:47 PM
Replies: 67
Views: 2,000
Posted By Duragrouch

I think several factors may be in play. I think...

I think several factors may be in play. I think once tooled up, producing a carbon-fiber reinforced frame may (I don't know) be cheaper than precision welded titanium or lugged and brazed chrome-moly...
Forum: Bicycle Mechanics
06-14-24, 07:15 PM
Replies: 26
Views: 531
Posted By Duragrouch

I completely agree. I just thought an explanation...

I completely agree. I just thought an explanation would be good, because looking at an extremely long/tall handlepost/stem on a folding bike, might make a person think, that using a long fork steer...
Forum: Bicycle Mechanics
06-14-24, 05:41 AM
Replies: 26
Views: 531
Posted By Duragrouch

Knowing why is always good. This is why "just say...

Knowing why is always good. This is why "just say no" was such a failure with kids. No one went into depth.
Forum: Bicycle Mechanics
06-14-24, 04:47 AM
Replies: 26
Views: 531
Posted By Duragrouch

(above) Both of you smart folks are correct. I...

(above) Both of you smart folks are correct. I think this may help illustrate for lesser folks:

My 20" folding bike has a *hugely* long handlepost (vertical part of the stem), 18" of vertical...
Forum: Folding Bikes
06-14-24, 03:33 AM
Replies: 15
Views: 647
Posted By Duragrouch

Wow, sounds interesting. A friend's dad in high...

Wow, sounds interesting. A friend's dad in high school had a collection of the early Hondas pre-civic, and everyone in that family was tall, it was pretty funny seeing them drive.

Gosh, the...
Forum: Folding Bikes
06-14-24, 02:47 AM
Replies: 63
Views: 6,348
Posted By Duragrouch

(above) Nope, not same as LHM. In the early...

(above) Nope, not same as LHM. In the early 1990s, LHM green was over $20 for I think 1 liter, which was over 4X the cost of standard brake fluid for cars. Looking now, LHM is $37/liter, unless you...
Forum: Mountain Biking
06-14-24, 02:34 AM
Replies: 16
Views: 501
Posted By Duragrouch

I'm not saying they are not different. But...

I'm not saying they are not different. But folding bikes also have stability issues. And by looking at the differences in design, versus the differences in stability, that sometimes yields knowledge....
Forum: Folding Bikes
06-14-24, 02:14 AM
Replies: 63
Views: 6,348
Posted By Duragrouch

Citroen developed a special hydraulic mineral oil...

Citroen developed a special hydraulic mineral oil (LHM green), hydrophobic (unlike earlier LHS "red" fluid they used which absorbed water), for their hydropneumatic suspension, and I think this was...
Forum: Folding Bikes
06-14-24, 01:57 AM
Replies: 63
Views: 6,348
Posted By Duragrouch

Noise: Yeah I guessed, especially since bike...

Noise: Yeah I guessed, especially since bike discs are so thin.

Heat conduction: Good for discs, bad if conducts through the pad to the caliper piston, which has rubber/viton seals, and can boil...
Forum: Bicycle Mechanics
06-14-24, 01:39 AM
Replies: 86
Views: 3,994
Posted By Duragrouch

Oh, yes, that's one of the things I like about my...

Oh, yes, that's one of the things I like about my folder conversion from 1X to 2X, I have better choices in chainline. I normally don't sweat it either, except when climbing out of the saddle, I try...
Forum: General Cycling Discussion
06-14-24, 12:26 AM
Replies: 67
Views: 2,000
Posted By Duragrouch

The LBS that has a whole (long) web page devoted...

The LBS that has a whole (long) web page devoted to recommending against carbon fiber frames and components (based on vast service experience), is that carbon is more fragile when loaded in a manner...
Forum: Classic & Vintage
06-13-24, 04:00 AM
Replies: 19
Views: 510
Posted By Duragrouch

Perhaps all the components are original! They...

Perhaps all the components are original! They look about right.
Forum: General Cycling Discussion
06-13-24, 03:58 AM
Replies: 67
Views: 2,000
Posted By Duragrouch

Oh, that's what that thing is on the Shimano road...

Oh, that's what that thing is on the Shimano road 11 FD I picked up used for a project but haven't used yet.

I always used to remove spoke protectors aka dork discs from all bikes once bought,...
Forum: Bicycle Mechanics
06-13-24, 03:03 AM
Replies: 86
Views: 3,994
Posted By Duragrouch

Queene Anne? Back when I lived in flatland,...

Queene Anne?

Back when I lived in flatland, yeah, 42x24 was the low on my 700c road race bike (and 24 was considered wimpy low on a race bike, but I wasn't a racer), but I can't recall anything...
Forum: Bicycle Mechanics
06-12-24, 11:42 PM
Replies: 23
Views: 616
Posted By Duragrouch

Radial contact: You're right, should get no axial...

Radial contact: You're right, should get no axial preload.

Cup and cone "angular" contact... no preload works ok, but not best, it loads only 2 or 3 bearing balls per side at a given time, and...
Forum: Folding Bikes
06-12-24, 11:23 PM
Replies: 7
Views: 477
Posted By Duragrouch

Thanks. It appears to be a design that is durable...

Thanks. It appears to be a design that is durable and serviceable.
Forum: Mountain Biking
06-12-24, 10:11 PM
Replies: 16
Views: 501
Posted By Duragrouch

My bike is a special case; It's a 20" wheel...

My bike is a special case; It's a 20" wheel folder, so perhaps seat closer to rear tire, though longer wheelbase there, and in front as well. The bike pictured below is not my bike but similar, but...
Forum: General Cycling Discussion
06-12-24, 09:50 PM
Replies: 53
Views: 2,271
Posted By Duragrouch

Obviously, a statement made of necessity. :)

Obviously, a statement made of necessity. :)
Forum: Bicycle Mechanics
06-12-24, 09:37 PM
Replies: 54
Views: 1,188
Posted By Duragrouch

(above) Those are an axial crimp, so not sure...

(above) Those are an axial crimp, so not sure they would hold on plastic housing as well as a circumferential crimp. But they look cool as heck. I'll have to look those up, whether they are for...
Forum: Touring
06-12-24, 09:27 PM
Replies: 39
Views: 1,042
Posted By Duragrouch

I think Utah was same, SC was last in country...

I think Utah was same, SC was last in country like that.

Under referendum, WA state went from state stores to private. Liquor costs the same (despite promises of more competition), high taxes,...
Forum: Bicycle Mechanics
06-12-24, 08:46 PM
Replies: 54
Views: 1,188
Posted By Duragrouch

Looking at mine now, the plastic ferrules on the...

Looking at mine now, the plastic ferrules on the brakes, the hole for them at the brake lever adjuster is plenty large for that, oversize even. Same at the shifter. So I think both are designed to...
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