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Search: Posts Made By: Duragrouch
Showing results 1 to 50 of 1000
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Forum: Touring
05-26-24, 08:41 PM
Replies: 31
Views: 623
Posted By Duragrouch

"E-Ink" always makes me laugh, but I know what...

"E-Ink" always makes me laugh, but I know what you are talking about, lower power consumption than a typical electronic display. But it always reminds me of this:

"Some people think paper faxes...
Forum: Bicycle Mechanics
05-26-24, 08:34 PM
Replies: 75
Views: 1,333
Posted By Duragrouch

Respectfully, I have many weird *questions* about...

Respectfully, I have many weird *questions* about lubricants, when I don't have the answer, and am always open to those that know more about a subject (I think I recognized your knowledge in a very...
Forum: Folding Bikes
05-26-24, 07:28 PM
Replies: 40
Views: 1,564
Posted By Duragrouch

Well, I agree with you, but the same argument...

Well, I agree with you, but the same argument could be made about a front derailleur mount, which all BFs used to come with, but as soon as they started offering 1Xs with 3x8 IGH, that was no longer...
Forum: Folding Bikes
05-26-24, 07:23 AM
Replies: 40
Views: 1,564
Posted By Duragrouch

I think that is an available option. Bike Friday...

I think that is an available option. Bike Friday will pretty much do anything for ya.
Forum: Road Cycling
05-26-24, 07:14 AM
Replies: 38
Views: 490
Posted By Duragrouch

Well now you've done it. It's like saying you've...

Well now you've done it. It's like saying you've never made a wheels-up landing, never got suckered in a car deal, never been audited by the IRS.
Forum: Folding Bikes
05-26-24, 06:57 AM
Replies: 45
Views: 3,342
Posted By Duragrouch

Agree with all, and mostly with regard to steel....

Agree with all, and mostly with regard to steel. But occasionally you find ringers; The following is a superb article from a great website. The author is not some armchair quarterback basing on...
Forum: Road Cycling
05-26-24, 06:37 AM
Replies: 38
Views: 490
Posted By Duragrouch

The chevrons I think do nothing. The linear...

The chevrons I think do nothing. The linear grooves, are either just hype, or actually increase lateral traction in corners. Look up "tire siping"; If effective, I think those grooves are doing the...
Forum: Bicycle Mechanics
05-26-24, 05:43 AM
Replies: 75
Views: 1,333
Posted By Duragrouch

I think moreso with your ribbed post. But that's...

I think moreso with your ribbed post. But that's just a pure guess.
Forum: Road Cycling
05-26-24, 05:34 AM
Replies: 38
Views: 490
Posted By Duragrouch

I understand what you are saying. Just wet, slip....

I understand what you are saying. Just wet, slip. But the formula above leaves out a whole lot of factors with regard to hydroplaning. In this case, depth of water, and width of tire. Tire pressure...
Forum: Road Cycling
05-26-24, 04:04 AM
Replies: 38
Views: 490
Posted By Duragrouch

I'm not saying that grooved treads are necessary...

I'm not saying that grooved treads are necessary on all 30mm road tires. But to say categorically that bike tires cannot hydroplane, is I think, wrong. There are a lot of rental ebikes in cities now,...
Forum: Folding Bikes
05-26-24, 03:02 AM
Replies: 40
Views: 1,564
Posted By Duragrouch

I see good in that it holds the head tube top and...

I see good in that it holds the head tube top and bottom. Some have said it is weak in that it's just point contact at the screw mounts, versus on a brompton where the rack attachment also bears...
Forum: Folding Bikes
05-26-24, 02:55 AM
Replies: 45
Views: 3,342
Posted By Duragrouch

[b]I hate to be the fly in the ointment on this,...

[b]I hate to be the fly in the ointment on this, but the pin specs say hardness Rc62-65; This is *excellent* hardness, we're talking quality knife hardness. It's also very difficult to get that hard...
Forum: Bicycle Mechanics
05-26-24, 01:57 AM
Replies: 75
Views: 1,333
Posted By Duragrouch

I get that. If everyone is saying it's standard...

I get that. If everyone is saying it's standard practice to grease the post, and there's not widespread slipping of them, there must be enough friction force. I'm just wondering how much margin there...
Forum: Road Cycling
05-26-24, 12:57 AM
Replies: 38
Views: 490
Posted By Duragrouch

First of all, I have Brandt's book, bought same...

First of all, I have Brandt's book, bought same time as my first quality road bike. Nevertheless, after a career in engineering, I've come to realize some of the things he said are dead wrong,...
Forum: Bicycle Mechanics
05-26-24, 12:13 AM
Replies: 75
Views: 1,333
Posted By Duragrouch

I just checked engineering tables for static...

I just checked engineering tables for static coefficients of friction.

Dry aluminum against aluminum, 1.05

Dry aluminum on mild steel, 0.61

Dry Mild steel on mild steel, 0.74

"Greasy",...
Forum: Road Cycling
05-25-24, 10:29 PM
Replies: 38
Views: 490
Posted By Duragrouch

Maybe, but at a certain minimum thickness of...

Maybe, but at a certain minimum thickness of standing water and certain minimum speed, the two related, it could aquaplane. I just no longer have access to a fluid dynamics simulation package, to...
Forum: Road Cycling
05-25-24, 10:01 PM
Replies: 38
Views: 490
Posted By Duragrouch

HAH! And I pulled those numbers out of thin air...

HAH! And I pulled those numbers out of thin air based on my engineering intuition. I still got it. I was always careful, but my wipeout happened in the wet while switching lanes on an ave with...
Forum: Folding Bikes
05-25-24, 09:42 PM
Replies: 40
Views: 1,564
Posted By Duragrouch

IIRC(?) I think he has a Bike Friday All-Packa...

IIRC(?) I think he has a Bike Friday All-Packa with similar large tires (what it was designed for*), so not a surprise. I think my Dahon Speed could fit 2.0s, I have some to try out after current...
Forum: Framebuilders
05-25-24, 08:08 PM
Replies: 59
Views: 2,482
Posted By Duragrouch

Sounds like you know what you are talking about....

Sounds like you know what you are talking about. Thanks.

I may have to try baking those screwdriver bits on the off-chance it's hydrogen embrittlement. I've never seen brittle this bad. Maybe they...
Forum: Road Cycling
05-25-24, 06:41 PM
Replies: 38
Views: 490
Posted By Duragrouch

I've had training in the engineering details of...

I've had training in the engineering details of hydroplaning of auto and truck tires, where tread depth is critical. I think this is less of a factor on bicycle tires which have a long and slender...
Forum: Folding Bikes
05-25-24, 06:28 PM
Replies: 7
Views: 367
Posted By Duragrouch

The Curl D9 looks pretty good on paper, though I...

The Curl D9 looks pretty good on paper, though I would need a 9T high cog for high enough top gear. I think there is at least one freehub and cassette that will do that (Capreo?) but may be out of...
Forum: Touring
05-25-24, 06:04 PM
Replies: 79
Views: 2,472
Posted By Duragrouch

So is the CS-RK3 (IGH) direct drive in high gear,...

So is the CS-RK3 (IGH) direct drive in high gear, so low and middle are both reductions, or is middle gear direct drive? If the latter, you only get one additional low gear. Either way though, if you...
Forum: Cyclocross and Gravelbiking (Recreational)
05-25-24, 05:51 PM
Replies: 15
Views: 368
Posted By Duragrouch

Yes I grasped that, from the Sheldon Brown...

Yes I grasped that, from the Sheldon Brown article. Even though they said a 650B conversion requires longer reach brakes, I grasped that with discs, you could easily have a bike that fits both 700C...
Forum: Classic & Vintage
05-25-24, 05:39 PM
Replies: 27
Views: 720
Posted By Duragrouch

Check if the tubes are butted, easy on the seat...

Check if the tubes are butted, easy on the seat tube. If butted, it's worth salvaging.
Forum: Touring
05-25-24, 05:32 PM
Replies: 15
Views: 317
Posted By Duragrouch

Yeah, my rims look exactly like that, after 10...

Yeah, my rims look exactly like that, after 10 years, keeping mostly out of rain, frequent pad cleaning, but the hills here take their toll. At first it was mostly the front rim, which was why I was...
Forum: Folding Bikes
05-25-24, 05:07 PM
Replies: 40
Views: 1,564
Posted By Duragrouch

You are so right. Double head tube mount would...

You are so right. Double head tube mount would both divide the vertical shear load between the two points, and also reduce the bending stress by an order of magnitude.

Old '60s Moulton "shoppers"...
Forum: Folding Bikes
05-25-24, 02:06 AM
Replies: 9
Views: 336
Posted By Duragrouch

I won't buy a new bike unless it had discs....

I won't buy a new bike unless it had discs. Needed for my terrain.

The PC22 looks nice. Wary about carbon durability against dings, but in high stress areas like top front of seat tube, carbon...
Forum: Touring
05-25-24, 01:21 AM
Replies: 15
Views: 317
Posted By Duragrouch

Link: Permission denied. 26" wheels used to...

Link: Permission denied.

26" wheels used to be the most versatile rim size in terms of tire selection, had everything from baldies to knobbies. Now, 700c same (29'ers is just oversize 700c), but...
Forum: Touring
05-25-24, 01:18 AM
Replies: 15
Views: 317
Posted By Duragrouch

Yeah I also want to convert from rim to disc...

Yeah I also want to convert from rim to disc brakes, and my downhills are not that long. Just 80 meters of descent in half km can cause rear drive side spoke break, with all braking on rear (20 inch...
Forum: General Cycling Discussion
05-25-24, 12:41 AM
Replies: 40
Views: 1,337
Posted By Duragrouch

Oh no worries. I was a specialist in the area. I...

Oh no worries. I was a specialist in the area. I was asked about the above in my job interview fresh out of university, aced it. No other candidates. Was not taught in school. I picked up from...
Forum: Framebuilders
05-25-24, 12:30 AM
Replies: 59
Views: 2,482
Posted By Duragrouch

Hmm. I have a screwdriver and security bit set...

Hmm. I have a screwdriver and security bit set from harbor freight where the bits fracture if you sneeze at them. Can nitrogen embrittlement be baked out at home-oven temps? When I derusted some...
Forum: Bicycle Mechanics
05-25-24, 12:23 AM
Replies: 29
Views: 620
Posted By Duragrouch

I did now, thank you. I hadn't recalled seeing...

I did now, thank you. I hadn't recalled seeing that term on amazon a couple years ago when I was perusing parts deep for my bike rebuild, though did see cassettes colored like that.
Forum: Cyclocross and Gravelbiking (Recreational)
05-24-24, 11:55 PM
Replies: 15
Views: 368
Posted By Duragrouch

It's on a trail, so you don't need serious...

It's on a trail, so you don't need serious mountain bike chops. No suspension at either end is necessary. You could modify hard-tail, hard-fork mountain bike easy. Keys are:
+ The frame fits you...
Forum: Classic & Vintage
05-24-24, 10:51 PM
Replies: 27
Views: 720
Posted By Duragrouch

That was before Walmart got big. Before that, I...

That was before Walmart got big. Before that, I think he did a christmas movie. Daughter was a reporter of some sort.
Forum: Bicycle Mechanics
05-24-24, 10:19 PM
Replies: 75
Views: 1,333
Posted By Duragrouch

Excellent point! The bolt had partially cracked...

Excellent point! The bolt had partially cracked through, which reduced stiffness and clamp force, allowing more movement, and squeak. Good warning sign for anything on the bike.
Forum: Advocacy & Safety
05-24-24, 10:15 PM
Replies: 24
Views: 516
Posted By Duragrouch

Her fault, but always try to ride and drive...

Her fault, but always try to ride and drive defensively. You also could have run into something that was supposed to be there, like a car about to back up to parallel park.
Forum: General Cycling Discussion
05-24-24, 10:13 PM
Replies: 33
Views: 727
Posted By Duragrouch

I think the two-kid trailer I have in storage,...

I think the two-kid trailer I have in storage, has a rubber-lined clamp that clamps around the left chainstay, and a u-joint between it and the trailer tongue. Early trailers aimed for a simple...
Forum: Bicycle Mechanics
05-24-24, 09:45 PM
Replies: 75
Views: 1,333
Posted By Duragrouch

Regular bikes with seatposts clamped in place for...

Regular bikes with seatposts clamped in place for years at a time and not moving up and down frequently, grease or anti-seize makes complete sense, to keep them from seizing in the seat tube.

But...
Forum: Bicycle Mechanics
05-24-24, 09:25 PM
Replies: 29
Views: 620
Posted By Duragrouch

I just enjoy your referring to the multi-colored...

I just enjoy your referring to the multi-colored one as oil slick. It fits. I'll have to remember that reference when referring to similar colored parts. I just looked for the term on OED as an...
Forum: Framebuilders
05-24-24, 09:15 PM
Replies: 59
Views: 2,482
Posted By Duragrouch

Just for my own knowledge sake... I'm a little...

Just for my own knowledge sake... I'm a little confused. Why would there need to be a *post*-weld purge? I know little about welding, but I imagine if there needed to be displacement of any gas, it...
Forum: Folding Bikes
05-24-24, 08:49 PM
Replies: 31
Views: 1,074
Posted By Duragrouch

That's really good news, I had thought I missed...

That's really good news, I had thought I missed the thudbuster boat when I passed on a used long 33.9 one on craigslist. Now if I can get the front handlepost re-engineered to used a suspension...
Forum: Folding Bikes
05-24-24, 08:47 PM
Replies: 31
Views: 1,074
Posted By Duragrouch

And ridiculously cheap for the capability I now...

And ridiculously cheap for the capability I now have. Original cracked frame was swapped for cheap used one, this time with improved seatpost bushing. Saved wheels and handlepost and handlebar....
Forum: Bicycle Mechanics
05-24-24, 08:34 PM
Replies: 75
Views: 1,333
Posted By Duragrouch

Dahon crack at tube slit: - Plastic bushing so...

Dahon crack at tube slit:
- Plastic bushing so clamping would deform tube more, adding stress. Redesigned with aluminum bushing which both doesn't compress, and reinforces joint. I'd like it even...
Forum: Classic & Vintage
05-24-24, 07:08 PM
Replies: 141
Views: 5,494
Posted By Duragrouch

Mixed bag. To their credit, many young folks are...

Mixed bag. To their credit, many young folks are not eager to own a car, a big money suck, and they also seem to value experiences over accumulation of things. I know someone graduated in a top...
Forum: Touring
05-24-24, 06:06 PM
Replies: 31
Views: 623
Posted By Duragrouch

I was always inpressed with the Bosch Automotive...

I was always inpressed with the Bosch Automotive Handbook and its *very* thin pages to jam a lot of info into a small book that could fit in many blazer side pockets. And that was 30 years ago. Hmm,...
Forum: Touring
05-24-24, 04:47 PM
Replies: 182
Views: 11,384
Posted By Duragrouch

It forgot to mention, graffiti viewing without...

It forgot to mention, graffiti viewing without the tiring walking like in a museum. "It's a feature, not a bug."
Forum: Touring
05-24-24, 04:38 PM
Replies: 79
Views: 2,472
Posted By Duragrouch

That's what I'm saying.

That's what I'm saying.
Forum: Bicycle Mechanics
05-24-24, 04:06 PM
Replies: 22
Views: 486
Posted By Duragrouch

Hyperglide compatible: While the freehub spline...

Hyperglide compatible: While the freehub spline pattern was an invention of Shimano (asymmetric, one groove wider than the rest, to ensure all the cogs are "indexed" in rotation position the same),...
Forum: Bicycle Mechanics
05-24-24, 07:25 AM
Replies: 75
Views: 1,333
Posted By Duragrouch

I'm just gonna step back and put on helmet,...

I'm just gonna step back and put on helmet, ballistic vest, athletic cup, and dive for the blast shelter on that one. You'll see.
Forum: Bicycle Mechanics
05-24-24, 06:54 AM
Replies: 75
Views: 1,333
Posted By Duragrouch

None at all. But if greased at the seapost collar...

None at all. But if greased at the seapost collar or seat tube, when folded, the seatpost goes way down, contacting the grease, then up, then down, then up, etc. Very quickly I think, it will have a...
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