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Search: Posts Made By: Duragrouch
Showing results 1 to 50 of 1000
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Forum: Cyclocross and Gravelbiking (Recreational)
05-27-24, 10:25 PM
Replies: 19
Views: 469
Posted By Duragrouch

(above) I'm seeing pretty darned good options for...

(above) I'm seeing pretty darned good options for new at that price point. Way less than only a couple years back. And switchable between 700C and 650B (with discs), I have to admit, that's the...
Forum: Folding Bikes
05-27-24, 10:19 PM
Replies: 159
Views: 11,914
Posted By Duragrouch

Shirley you cannibal be serious.

Shirley you cannibal be serious.
Forum: Touring
05-27-24, 09:43 PM
Replies: 84
Views: 2,664
Posted By Duragrouch

I have personal history with one of the entities....

I have personal history with one of the entities. I also had brief ownership of a 3x7. And SAs and Shimanos in my youth and serviced both. But that doesn't bias me for or against either in terms of...
Forum: Road Cycling
05-27-24, 09:30 PM
Replies: 53
Views: 867
Posted By Duragrouch

OK. Sorry I didn't see your comment until now.

OK. Sorry I didn't see your comment until now.
Forum: Road Cycling
05-27-24, 08:33 PM
Replies: 53
Views: 867
Posted By Duragrouch

OK so I yield. Generally, skinny tires on road...

OK so I yield. Generally, skinny tires on road race bikes do not aquaplane at speeds that are achieved under normal human power, I have not been able to find empirical evidence to the contrary. I...
Forum: Bicycle Mechanics
05-27-24, 08:30 PM
Replies: 81
Views: 1,651
Posted By Duragrouch

OK, I'll buy that. I just... like to learn. Like...

OK, I'll buy that. I just... like to learn. Like to know reasons for things, if for no other reason than I find it interesting.
Forum: Cyclocross and Gravelbiking (Recreational)
05-27-24, 08:25 PM
Replies: 19
Views: 469
Posted By Duragrouch

And from what I hear, "non-1X" goes cheap these...

And from what I hear, "non-1X" goes cheap these days. :)

Given the all-new everything on the REI, I'd say, a well-used but quality bike, and replacement of all needed items such as tires and...
Forum: Road Cycling
05-27-24, 05:17 AM
Replies: 53
Views: 867
Posted By Duragrouch

The same thing I advise all that I teach about...

The same thing I advise all that I teach about hydroplaning: Slow down. That gives time for the water to flow around. It's the difference between diving into the water from height of 5 feet and...
Forum: Road Cycling
05-27-24, 04:18 AM
Replies: 53
Views: 867
Posted By Duragrouch

All I'm saying, and this is all I'm saying, is...

All I'm saying, and this is all I'm saying, is that you can't have a generalized hydroplaning formula that does not take into account tire contact patch width versus contact patch length, as well as...
Forum: Touring
05-27-24, 02:55 AM
Replies: 84
Views: 2,664
Posted By Duragrouch

Depends. I'm not an expert. Sturmey-Archer and...

Depends. I'm not an expert. Sturmey-Archer and Sachs/SRAM both made 3-speed IGHs (among many others), and the SRAM Dual Drive also has external derailleur gears, but I've also heard in recent months...
Forum: Bicycle Mechanics
05-27-24, 01:52 AM
Replies: 81
Views: 1,651
Posted By Duragrouch

OK, good info... I'm a little confused, but not...

OK, good info... I'm a little confused, but not in a bad way... I said previously that I wondered whether the grease was being squeezed out to the point of metal to metal, and it sounded like you...
Forum: Folding Bikes
05-27-24, 12:58 AM
Replies: 43
Views: 1,696
Posted By Duragrouch

No rant worries, thanks for the info. Looked good...

No rant worries, thanks for the info. Looked good at first glance, but I see your points. Wow, I would have thought the latter versus the former of my guesses, but yeah, tilting the high racks down...
Forum: Touring
05-26-24, 11:27 PM
Replies: 34
Views: 744
Posted By Duragrouch

Yeah I figured it had to be something along those...

Yeah I figured it had to be something along those lines, but didn't know exactly, so looked it up before I posted. Pretty amazing. Until now I had thought that e-paper displays were just more legible...
Forum: Touring
05-26-24, 08:41 PM
Replies: 34
Views: 744
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: 81
Views: 1,651
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: 43
Views: 1,696
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: 43
Views: 1,696
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: 53
Views: 867
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: 3,378
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: 53
Views: 867
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: 81
Views: 1,651
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: 53
Views: 867
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: 53
Views: 867
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: 43
Views: 1,696
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: 3,378
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: 81
Views: 1,651
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: 53
Views: 867
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: 81
Views: 1,651
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: 53
Views: 867
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: 53
Views: 867
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: 43
Views: 1,696
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: 2,541
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: 53
Views: 867
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: 384
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: 84
Views: 2,664
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: 19
Views: 469
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: 29
Views: 890
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: 360
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: 43
Views: 1,696
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: 357
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: 360
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: 360
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: 1,381
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: 2,541
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: 668
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: 19
Views: 469
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: 29
Views: 890
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: 81
Views: 1,651
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: 23
Views: 611
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: 775
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...
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