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Search: Posts Made By: Duragrouch
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
05-26-24, 01:57 AM
Replies: 55
Views: 969
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: 10
Views: 161
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: 55
Views: 969
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: 10
Views: 161
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: 10
Views: 161
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: 32
Views: 1,257
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: 2,413
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: 10
Views: 161
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: 351
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: 76
Views: 2,335
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: 12
Views: 249
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: 26
Views: 634
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: 12
Views: 259
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: 32
Views: 1,257
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: 310
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: 12
Views: 259
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: 12
Views: 259
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: 1,302
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: 2,413
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: 27
Views: 566
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: 12
Views: 249
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: 26
Views: 634
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: 55
Views: 969
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: 15
Views: 329
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: 700
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: 55
Views: 969
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: 27
Views: 566
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: 2,413
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: 28
Views: 968
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: 28
Views: 968
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: 55
Views: 969
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: 117
Views: 4,539
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: 28
Views: 539
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: 11,339
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: 76
Views: 2,335
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: 462
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: 55
Views: 969
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: 55
Views: 969
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...
Forum: Folding Bikes
05-24-24, 04:48 AM
Replies: 42
Views: 3,243
Posted By Duragrouch

(above) Good looking repair! Thanks for the...

(above) Good looking repair! Thanks for the useful info!

Good price on the pin. Hard! Excellent choice, I'll have to remember that. EDIT: Uh, I hate to be the fly in the ointment on this, but the...
Forum: Classic & Vintage
05-23-24, 11:41 PM
Replies: 117
Views: 4,539
Posted By Duragrouch

Just read the long Eroica Japan thread. Any of...

Just read the long Eroica Japan thread. Any of the above bikes would qualify for any of the Eroica rides worldwide, even the Trek. (up thru 1987) The Eroica California is 22 SEP 2024 in Cambria on...
Forum: Classic & Vintage
05-23-24, 11:29 PM
Replies: 117
Views: 4,539
Posted By Duragrouch

RD definitely off, wrapped in sheet urethane...

RD definitely off, wrapped in sheet urethane foam, and taped to right chainstay. Rear dropouts, they make plastic things to go in there, but you could also use an old axle and quick release. Front...
Forum: General Cycling Discussion
05-23-24, 10:44 PM
Replies: 56
Views: 1,659
Posted By Duragrouch

Why go just a 12 or 13 tooth jump on the crank?...

Why go just a 12 or 13 tooth jump on the crank? 16T is the defacto standard now and shifts well, 50/34 is very common, as well as 52/36. Both are common on a 110mm BCD. Smaller than 34 and you'll...
Forum: Classic & Vintage
05-23-24, 10:36 PM
Replies: 90
Views: 3,854
Posted By Duragrouch

I'm not a frame builder, but retired from...

I'm not a frame builder, but retired from structural engineering. I'd be very questioning of this, but the 2022 date is recent enough, my bet is it's been FEA'd out to be sound. Doesn't look that...
Forum: Classic & Vintage
05-23-24, 10:26 PM
Replies: 90
Views: 3,854
Posted By Duragrouch

Why? I've heard that mini-velos are super hot in...

Why? I've heard that mini-velos are super hot in Japan, more agile in traffic and a bit more compact in parking space and into a car hatch, though still not as small as a folder. But some ride them...
Forum: Classic & Vintage
05-23-24, 09:44 PM
Replies: 90
Views: 3,854
Posted By Duragrouch

Does the Japanese flag mean Karate? Does the...

Does the Japanese flag mean Karate? Does the Yin-Yang mean Taekwondo?
Forum: Classic & Vintage
05-23-24, 08:27 PM
Replies: 90
Views: 3,854
Posted By Duragrouch

Food: Looks like miso soup and chirashi(?) bowl....

Food: Looks like miso soup and chirashi(?) bowl. Delish!

I'd LOVE an otter cafe!

Bullet train: *sigh-envy* I didn't even know about the mag-lev, that's awesome.

Mt Fuji: (Me showing pic of...
Forum: General Cycling Discussion
05-23-24, 04:29 AM
Replies: 33
Views: 700
Posted By Duragrouch

The Bike Friday travel bike, which is sold solo...

The Bike Friday travel bike, which is sold solo or with a travel suitcase for it that converts to a two wheel trailer at destination, uses a trailer connector which is a male quick-disconnect...
Forum: General Cycling Discussion
05-23-24, 03:32 AM
Replies: 40
Views: 1,302
Posted By Duragrouch

Small thing, just for clarity. Most cars have...

Small thing, just for clarity. Most cars have simply "suspension", or more accurately "passive suspension". "Active" suspension is where the engine or an electric motor drive a hydraulic pump that...
Forum: Bicycle Mechanics
05-23-24, 01:25 AM
Replies: 12
Views: 247
Posted By Duragrouch

+1. This is starting to make a whole lot more...

+1. This is starting to make a whole lot more sense to me now, both carrier, and difference between mountain and road.
Forum: Touring
05-23-24, 12:31 AM
Replies: 28
Views: 539
Posted By Duragrouch

Have you seen Platoon (1986)?

Have you seen Platoon (1986)?
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