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Search: Posts Made By: Kuromori
Showing results 1 to 50 of 528
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Forum: Framebuilders
04-05-20, 09:47 PM
Replies: 82
Views: 8,103
Posted By Kuromori

CCM which I think licensed the technology, at...

CCM which I think licensed the technology, at least for some joints, just used undersized ring preforms so they would just fall down the tubes without getting stuck. When the part of the ring...
03-30-20, 01:09 PM
Replies: 4
Views: 151
Posted By Kuromori

I'm pretty sure it's just a M5x0.8mm nut. You...

I'm pretty sure it's just a M5x0.8mm nut. You don't need anything but a ruler to measure thread pitch. Metric thread pitch is just mm per thread, so if you measure 8mm for 10 threads or such, it's...
03-29-20, 10:19 AM
Replies: 3
Views: 189
Posted By Kuromori

I've seen this article before. The...

I've seen this article before.

The interesting thing is that the history of 753 may stretch back to 30's and 40's in one form or another. Reynolds was offering quenched and tempered 531 in the...
03-18-20, 07:25 AM
Replies: 16
Views: 522
Posted By Kuromori

There are some higher end bronze welded ones made...

There are some higher end bronze welded ones made with butted 531 throughout, but they usually have other flourishes like wraparound seatstays and the obvious tubing decals. There were ones that...
03-17-20, 08:55 PM
Replies: 16
Views: 522
Posted By Kuromori

It's a $100 bike with a Brooks in decent...

It's a $100 bike with a Brooks in decent condition. It's hard to go wrong. Even if it's a low end one, you could do a lot worse for $100.
Forum: Framebuilders
03-17-20, 08:34 PM
Replies: 82
Views: 8,103
Posted By Kuromori

Might have been those very pictures I was looking...

Might have been those very pictures I was looking at. Looking again, it seems like it's probably gas welded after all. There's a little difference in color, but that could just be the lighting and...
Forum: Framebuilders
03-17-20, 06:52 PM
Replies: 82
Views: 8,103
Posted By Kuromori

Yeah, I've heard about gas welding too, but it's...

Yeah, I've heard about gas welding too, but it's difficult to translate technical articles both because they use lots of jargon and even worse, historical jargon. I've run across it in some older...
Forum: Framebuilders
03-17-20, 10:57 AM
Replies: 82
Views: 8,103
Posted By Kuromori

It's not really right to say any of the...

It's not really right to say any of the traditional construction techniques cause failure. All the traditional construction techniques when used conservatively can produce frames that last a...
03-16-20, 11:04 PM
Replies: 16
Views: 522
Posted By Kuromori

No, the lowest end ones did not. Less lower end...

No, the lowest end ones did not. Less lower end ones used straight gauge 531 or A&P. Higher end ones could be built with either 531 or A&P.
Forum: Framebuilders
03-16-20, 10:48 PM
Replies: 82
Views: 8,103
Posted By Kuromori

I think 631 is one of the only steels still being...

I think 631 is one of the only steels still being made in 1/7/1 but I don't think they're all stocked here and the 25.4 top tube is limited to 8/5/8.

Even though big fillets are mostly for...
Forum: Framebuilders
03-16-20, 10:23 PM
Replies: 34
Views: 2,060
Posted By Kuromori

Yes, if you look at spec sheets, most cycle tube...

Yes, if you look at spec sheets, most cycle tube manufacturers list a higher UTS than typical of 4130. Maybe some of it is due to faster rates of cooling when normalizing something so thin, but...
03-15-20, 11:46 AM
Replies: 13
Views: 377
Posted By Kuromori

The same could be said about most other bikes...

The same could be said about most other bikes then. Fatigue doesn't necessarily come from normal pedaling, which if it's in the 10,000,000 cycle range, is probably below the fatigue limit. Frames are...
03-15-20, 11:28 AM
Replies: 13
Views: 377
Posted By Kuromori

Sorry but this has to be corrected on multiple...

Sorry but this has to be corrected on multiple counts.


Reynolds soon released 753R which was made in 531SL gauges, with centers of 0.56mm, which later just became 753 as the original metric...
Forum: Framebuilders
03-15-20, 10:56 AM
Replies: 82
Views: 8,103
Posted By Kuromori

Good abrasives can make short of any steel if you...

Good abrasives can make short of any steel if you try, that's not really the point. The point was that air hardening steels are particularly well suited for dealing with undercutting issues, dynafile...
03-15-20, 07:57 AM
Replies: 13
Views: 377
Posted By Kuromori

That really sounds more like rock hard tires than...

That really sounds more like rock hard tires than too stiff a frame to me.
03-15-20, 03:36 AM
Replies: 13
Views: 377
Posted By Kuromori

I've never really been satisfied by the argument...

I've never really been satisfied by the argument of either "side." There's clearly a point where additional stiffness doesn't matter, and there's clearly a point where lack of stiffness feels unsafe....
Forum: Framebuilders
03-15-20, 12:27 AM
Replies: 34
Views: 2,060
Posted By Kuromori

Results don't seem that surprising to me. If...

Results don't seem that surprising to me. If there's a small gap, the strength of the braze joint can exceed that of the base material, something that can't be said for a big fillet laid on top....
Forum: Framebuilders
03-15-20, 12:20 AM
Replies: 82
Views: 8,103
Posted By Kuromori

It's also good reason to dish out a few extra...

It's also good reason to dish out a few extra bucks on 631 (or 853 etc) tubes, expert or not, when making big fillets. It's not just that the steel is stronger against breakage, but that the steel is...
03-14-20, 11:47 PM
Replies: 13
Views: 377
Posted By Kuromori

This made me think some about buckling failures...

This made me think some about buckling failures in bicycle frames. This guy has a doctorate in this, so I really wish he explained his methodology more. I'm sure he's a smart guy, maybe he's right,...
Forum: Framebuilders
03-09-20, 03:42 PM
Replies: 46
Views: 3,587
Posted By Kuromori

Of course it is possible to have an entirely...

Of course it is possible to have an entirely inadequate lug for pure lugged construction without any butt brazing, and with a well mitered joint, it doesn't matter, as the lug has largely been made...
Forum: Framebuilders
03-09-20, 04:52 AM
Replies: 46
Views: 3,587
Posted By Kuromori

I think the custom frame builder world places too...

I think the custom frame builder world places too much importance on tube-to-tube contact. It's clearly best practice, and every builder of high end frames should aim to do so as it is the superior...
03-08-20, 03:19 PM
Replies: 23
Views: 1,397
Posted By Kuromori

Yes, I meant to say exactly that, especially...

Yes, I meant to say exactly that, especially silver brazed cold-drawn (non-heat-treated) tubes.

Silver brazing is done at subcritical temperatures and causes cold-worked grain structure to...
03-08-20, 01:44 PM
Replies: 29
Views: 1,193
Posted By Kuromori

34crmo4 is is a higher carbon version of 25crmo4,...

34crmo4 is is a higher carbon version of 25crmo4, and equivalent to 4135 instead of 4130, but basically it's a relative of 4130. It's probably not what SLX was made of since Columbus tended to use...
03-08-20, 01:14 PM
Replies: 23
Views: 1,397
Posted By Kuromori

Braze-ons do in fact weaken steel cycle tubing,...

Braze-ons do in fact weaken steel cycle tubing, especially silver brazing, and especially silver brazing on cold-worked tubes.

That being said, you can obviously make a durable frame with...
03-01-20, 04:52 PM
Replies: 17
Views: 681
Posted By Kuromori

Even Berto admitted in an article where he tested...

Even Berto admitted in an article where he tested top end groups that Campy shifted just as well as Suntour on racing corncobs, in some ways better. Berto's gripe with Campy is that he wanted good...
03-01-20, 04:30 PM
Replies: 61
Views: 2,613
Posted By Kuromori

The point of the word/concept isn't to capture as...

The point of the word/concept isn't to capture as much as possible under a large umbrella. Chindogu are in fact, usually gags, much like a Rube Goldberg machine, except Rube Goldberg machines...
02-29-20, 11:35 PM
Replies: 61
Views: 2,613
Posted By Kuromori

Calling PMP cranks chindogu is missing the point....

Calling PMP cranks chindogu is missing the point. The invention actually has to work and do the thing it was designed to do. It doesn't mean invention that doesn't work. It means an invention that...
02-29-20, 06:04 PM
Replies: 61
Views: 2,613
Posted By Kuromori

Unuseless in this sense means not useless but...

Unuseless in this sense means not useless but also not useful, so a pointless less invention that actually does something, just not anything useful. The PMP cranks are actually useless as an...
02-29-20, 03:39 PM
Replies: 15
Views: 727
Posted By Kuromori

To be fair Herse didn't invent the 3 arm...

To be fair Herse didn't invent the 3 arm crankset, and they were actually fairly common when it was first introduced. Not even the big circular chainring cutouts can be attributed to Herse, although...
02-28-20, 09:52 PM
Replies: 15
Views: 727
Posted By Kuromori

These sorts of stems also tend to be considerably...

These sorts of stems also tend to be considerably lighter and flexier than the plain looking stems due to often having a hollow extension. Even though a solid center shouldn't do much, there seems to...
02-28-20, 06:26 PM
Replies: 7
Views: 357
Posted By Kuromori

That's just an eBay search. Supposedly, that...

That's just an eBay search. Supposedly, that shop's site got hacked, then got turned into a site that just displays eBay links in some sort of money making scheme.
02-27-20, 10:58 PM
Replies: 18
Views: 1,088
Posted By Kuromori

Late 70's or early 80's based on the Reynolds...

Late 70's or early 80's based on the Reynolds decal
02-27-20, 08:34 PM
Replies: 31
Views: 1,205
Posted By Kuromori

More pedantry, a cog is a tooth on a cogwheel...

More pedantry, a cog is a tooth on a cogwheel (sometimes shortened to cog), which is a gearwheel consisting of cogs (teeth) that are historically separate pieces inserted into the wheel. The word...
02-25-20, 01:00 PM
Replies: 37
Views: 1,991
Posted By Kuromori

Chainstays look rapid taper to me, so I'd guess...

Chainstays look rapid taper to me, so I'd guess more 30's than 20's.
02-25-20, 12:50 PM
Replies: 18
Views: 409
Posted By Kuromori

As noted in some of the linked threads you can...

As noted in some of the linked threads you can use a coupling nut in the front.
02-25-20, 12:46 PM
Forum: Framebuilders
02-24-20, 11:44 PM
Replies: 46
Views: 3,587
Posted By Kuromori

Excell tubing from France. They also made a silly...

Excell tubing from France. They also made a silly steel tube with carbon fiber reinforcements that was no stiffer or lighter than their other steel tubes.
02-24-20, 12:18 PM
Replies: 9
Views: 399
Posted By Kuromori

You can't blame profits then claim there's no...

You can't blame profits then claim there's no additional costs. If there's no additional costs, how can it be eating into profits? Likewise, if there's additional costs that the consumer is unwilling...
02-23-20, 08:35 PM
Replies: 14
Views: 534
Posted By Kuromori

Springs get weaker with use over time, and dirty,...

Springs get weaker with use over time, and dirty, worn, or binding pivots can create additional friction. As others mentioned cables are also a concern.
02-23-20, 08:23 PM
Replies: 24
Views: 816
Posted By Kuromori

I'm pretty sure all shadow, all SRAM (from the...

I'm pretty sure all shadow, all SRAM (from the first SRAM derailer) and some Microshift lack sprung B pivots. Some have small offsets. Dual sprung pivots give more flexibility in gearing choices, but...
02-23-20, 08:04 PM
Replies: 34
Views: 1,153
Posted By Kuromori

Oddly enough, LFB/Sifbronze is actually brass if...

Oddly enough, LFB/Sifbronze is actually brass if you go by the tin/zinc distinction but it's called bronze by tradition.
02-23-20, 04:07 PM
Replies: 9
Views: 399
Posted By Kuromori

It's easy to blame profits, but if it costs more,...

It's easy to blame profits, but if it costs more, it's reasonable to expect the costs to be passed down to the consumer, a cost a consumer may not want to bear. These are things that bike companies...
02-23-20, 03:27 PM
Replies: 24
Views: 816
Posted By Kuromori

It was really only Shimano poised to jump on it...

It was really only Shimano poised to jump on it because they realized they could make an indexed system that worked well using their tooth profiles and chain. Everyone else was mostly following...
02-23-20, 07:50 AM
Replies: 24
Views: 816
Posted By Kuromori

Shimano slant parallelograms started with SIS, so...

Shimano slant parallelograms started with SIS, so 7400. RD-7300 was the weird AX thing. RD-7200 is merely a dual sprung dropped parallelogram that was an evolution of the Crane.
02-16-20, 05:01 PM
Replies: 24
Views: 506
Posted By Kuromori

26.2mm seatposts are a thing but usually for...

26.2mm seatposts are a thing but usually for something like French straight gauge Vitus 888. It is very unusual to need it on a Imperial dimentioned frame, especially one with quality tubes.
02-16-20, 04:45 PM
Replies: 37
Views: 1,480
Posted By Kuromori

The problem is a lot of the features you're...

The problem is a lot of the features you're looking at on the frame are more correlated with era than any particular builder. The fender tabs, lack of brake holes, what looks to me like 3/4"...
02-16-20, 02:56 PM
Replies: 37
Views: 1,480
Posted By Kuromori

The attachment points on the blades and stays are...

The attachment points on the blades and stays are fender eyelets. I believe the idea was to make the fenders easily removable with wingnuts. It very much looks the part of a British lightweight.
02-15-20, 05:56 PM
Replies: 37
Views: 1,480
Posted By Kuromori

Lack of a through hole in the crown indicates it...

Lack of a through hole in the crown indicates it probably would have been used with something like Resilion brakes.


It's hard to tell from the photos, but it looks like it could be a headclip...
02-15-20, 05:27 PM
Replies: 37
Views: 1,480
Posted By Kuromori

That sure looks like a Ernest Russ "super...

That sure looks like a Ernest Russ "super resilient" extra strong fork, which would probably date it around the 30's. I believe these forks were sold to other frame builders, so a Russ fork doesn't...
02-15-20, 05:23 PM
Replies: 20
Views: 657
Posted By Kuromori

CLB2s are self energizing and therefore different...

CLB2s are self energizing and therefore different from most center pulls. Whether or not this is a good thing may vary on rider preferences.
Showing results 1 to 50 of 528
 


 
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