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Search: Posts Made By: Kuromori
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03-29-20, 10:19 AM
Replies: 3
Views: 242
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: 636
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...
Forum: Framebuilders
03-09-20, 04:52 AM
Replies: 46
Views: 4,550
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...
03-01-20, 04:30 PM
Replies: 61
Views: 3,038
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...
02-23-20, 07:50 AM
Replies: 24
Views: 938
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.
02-15-20, 05:27 PM
Replies: 37
Views: 1,609
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...
02-14-20, 06:56 PM
Replies: 50
Views: 2,438
Posted By Kuromori

Phase diagrams don't show the effects of...

Phase diagrams don't show the effects of tempering. Silver brazing occurs right in the range of subcritical annealing (extreme tempering), which drops strength right at the joint compared to strength...
02-12-20, 07:32 AM
Replies: 11
Views: 732
Posted By Kuromori

A great read that touches on nascent...

A great read that touches on nascent technological trends of the time, and explains why classic designs stuck around for so long.

Even Berto, the man who said Campy shifts poorly but exactly as...
Forum: Framebuilders
02-12-20, 03:56 AM
Replies: 10
Views: 1,068
Posted By Kuromori

You can buy an endoscope camera for about $15...

You can buy an endoscope camera for about $15 nowadays, which will tell you if there was penetration in the ever important tube to tube miter area. It's possible to non-destructively see if you got...
Forum: Framebuilders
02-02-20, 09:54 PM
Replies: 6
Views: 847
Posted By Kuromori

I've seen a bunch of tall bikes and what not made...

I've seen a bunch of tall bikes and what not made with stick welders, so as pointed out before, it's apparently not unworkable when working with thick heavy tubing.

Most industrial literature...
01-30-20, 11:19 PM
Replies: 21
Views: 908
Posted By Kuromori

Dave is a great framebuilder, but clearly other...

Dave is a great framebuilder, but clearly other qualified master frame builders disagree with him, if only qualified master frame builders are qualified to disagree with him. It's not like Dave...
01-30-20, 03:06 AM
Replies: 21
Views: 908
Posted By Kuromori

Yes, quill stems are awful on small bikes, I've...

Yes, quill stems are awful on small bikes, I've cut many a quill stem to length, but that's just the nature of the vintage beast. 5ft is short for 700c, doable, but short.

8cm of BB drop doesn't...
01-29-20, 10:16 PM
Replies: 21
Views: 908
Posted By Kuromori

I pretty much think the opposite of this, and I...

I pretty much think the opposite of this, and I usually ride frames on the smaller side, so it bothers me when frames are designed this way.

Steep seat tubes are bad, in the modern school of bike...
Forum: Framebuilders
01-29-20, 09:21 PM
Replies: 9
Views: 872
Posted By Kuromori

Sliders/rockers are mostly for the ability to...

Sliders/rockers are mostly for the ability to have single speed tensioning ability with vertical dropouts or discs, or to minimize wheelbase. Some people use it to minimize the wheelbase when they...
01-22-20, 08:21 PM
Replies: 36
Views: 2,333
Posted By Kuromori

The emphasis on rigidity, down to round...

The emphasis on rigidity, down to round track-like fork blades, and use of 700c on earlier randonneuses is interesting because it goes against several modern platitudes about randonneuses.

For...
01-22-20, 04:46 PM
Replies: 36
Views: 2,333
Posted By Kuromori

www.flickr.com/photos/41420640@N07/49381147657/in/...

www.flickr.com/photos/41420640@N07/49381147657/in/album-72157712640884851/ (Herse Catalogs)
www.rennrad-news.de/forum/threads/der-rebour-thread.147478/post-4633286 (PDF of text)...
Forum: Framebuilders
01-19-20, 03:42 PM
Replies: 37
Views: 2,735
Posted By Kuromori

Butted tubes are annealed several times in the...

Butted tubes are annealed several times in the butting process, there's a limit to how much cold working a tube can take, as cold work results in work hardening, so Reynolds selects particularly...
Forum: Framebuilders
01-16-20, 04:27 AM
Replies: 17
Views: 1,626
Posted By Kuromori

Reynolds traditionally used inverted triangle...

Reynolds traditionally used inverted triangle decals for their fork blades. They've since switched to modern decals.

Yes, brazing was typical when 531 was developed, which is why it was developed...
Forum: Framebuilders
01-15-20, 04:13 PM
Replies: 17
Views: 1,626
Posted By Kuromori

No strict need for 853 for MAX blades, Columbus...

No strict need for 853 for MAX blades, Columbus makes them, so does NOVA's supplier. You can make fork blades from 0.9/0.6 blanks, Reynolds just doesn't like to make blades that thin. However, if you...
01-13-20, 12:29 AM
Replies: 31
Views: 955
Posted By Kuromori

It depends what you consider "vintage" ...

It depends what you consider "vintage"

Saddles: There are a lot of saddles that aren't ass hatchets with domed rear ends and are lighter and cheaper than a Brooks now and don't need breaking in....
01-07-20, 08:28 PM
Replies: 45
Views: 1,739
Posted By Kuromori

Le Cyclo started off as a French company, but...

Le Cyclo started off as a French company, but when the Great Depression caused high import duties in the UK, Cyclo and the importer started up production in Birmingham for the UK market. Eventually...
01-07-20, 05:17 PM
Replies: 21
Views: 1,280
Posted By Kuromori

I found a better picture of the decal and the...

I found a better picture of the decal and the "mang-moly" under 753 is in very small font, about a quarter of the height of REYNOLDS 753 or TITANIUM

Forks say 531

Tubing decal says:
COMPOSITE...
12-23-19, 03:33 PM
Replies: 113
Views: 7,197
Posted By Kuromori

This could have been avoided if you started with...

This could have been avoided if you started with a Konno Specialized Allez
12-22-19, 07:40 PM
Replies: 19
Views: 1,223
Posted By Kuromori

I'm guessing '70 Gran Sport or thereabouts. Since...

I'm guessing '70 Gran Sport or thereabouts. Since it's chromed you might be able to make out any Reynolds stampings on the tubes.
12-19-19, 09:58 AM
Replies: 16
Views: 1,406
Posted By Kuromori

This is a bit of a myth. Many steel frames do...

This is a bit of a myth. Many steel frames do fail by fatigue, and the development of newer steels has generally sought not just higher strength, but also greater fatigue life. Reynolds H.M. tubing...
12-19-19, 06:55 AM
Replies: 34
Views: 2,377
Posted By Kuromori

I agree, and I guess I didn't state it clearly...

I agree, and I guess I didn't state it clearly enough, I would only assume it applies for the era, and may or may not apply for earlier Paramounts. The book is targeted to people considering...
12-19-19, 05:04 AM
Replies: 34
Views: 2,377
Posted By Kuromori

For '85 555T seem to be double butted, but found...

For '85 555T seem to be double butted, but found on their touring frames, and 555SL on their racier bikes. '86 shows both double and triple butted variants of 555T, but it could just be someone...
12-09-19, 04:48 AM
Replies: 21
Views: 582
Posted By Kuromori

The bolt is free? Have you tried pulling on the...

The bolt is free? Have you tried pulling on the wedge from the bottom of the steerer? You can make a puller from a piece of wood with a hole, some appropriately sized fender washers, and a bolt. If...
12-08-19, 11:21 PM
Replies: 43
Views: 2,898
Posted By Kuromori

I reread it 3 times over, maybe I'm fuzzy on what...

I reread it 3 times over, maybe I'm fuzzy on what exactly you mean, but I can't read it any other way but to say continue spacing out the granny ring until it works, while keeping the triplizer in...
12-07-19, 09:20 PM
Replies: 43
Views: 2,898
Posted By Kuromori

There's enough of a gap between the teeth of the...

There's enough of a gap between the teeth of the granny and the outer tabs/bolts for the chain to sit? Or is the spacing basically equivalent to running a triple outer and granny with no middle,...
12-07-19, 01:10 PM
Replies: 20
Views: 750
Posted By Kuromori

Are you sure that's not just a uniglide cassette?

Are you sure that's not just a uniglide cassette?
12-07-19, 10:07 AM
Replies: 43
Views: 2,898
Posted By Kuromori

You might be able to mount it, but I'm pretty...

You might be able to mount it, but I'm pretty sure the teeth of the small ring are going to be pretty much up against the spider tabs, leaving no room for the chain to actually sit on the chainring,...
11-30-19, 02:27 AM
Replies: 176
Views: 16,742
Posted By Kuromori

Looks like I managed to download the relevant...

Looks like I managed to download the relevant document from VCC before the paywall went up, although I'm missing a few. I've put the relevant page up on my Reynolds page (...
11-29-19, 08:12 PM
Replies: 13
Views: 927
Posted By Kuromori

Single speed ones are the safest bet.If you have...

Single speed ones are the safest bet.If you have spare doubles, doubles will sometimes work depending on the thickness of the dropout and the length of the nut. Campagnolo dropouts are ~7mm between...
11-27-19, 10:43 PM
Replies: 36
Views: 2,870
Posted By Kuromori

I've seen chainring bolts used for the same...

I've seen chainring bolts used for the same purpose. The nut is flanged and low profile, and the OD is 10mm, same as a rear axle.
11-27-19, 09:17 PM
Replies: 12
Views: 1,432
Posted By Kuromori

It helps prevent chain jams from chainsuck since...

It helps prevent chain jams from chainsuck since there's no chainstay for it to jam into. It also helps with mud clearance as normal chainstays are lower to the ground, and there's a tight fit...
11-18-19, 05:32 AM
Replies: 35
Views: 2,992
Posted By Kuromori

Some notes: Reynolds was drawn to SWG...

Some notes:

Reynolds was drawn to SWG despite being in Birmingham.
See "Top Tubes" brochure:
Reynolds "Top Tubes" booklet (10-1977)...
11-09-19, 04:41 PM
Replies: 75
Views: 5,107
Posted By Kuromori

I don't think 753 was ever really drawn out to...

I don't think 753 was ever really drawn out to 0.3mm. 0.5mm and 0.3mm are misnomers when it comes to Reynolds, as they're actually ~0.56mm and ~0.38mm as the metric labels were just nominal and the...
08-29-19, 04:58 AM
Replies: 3,306
Views: 291,550
Posted By Kuromori

What reach do you need? A lot of brakes can be...

What reach do you need? A lot of brakes can be configured that way, they are usually the ones where the barrel adjust fitting looks bolted on and there's no quick release.
08-26-19, 09:51 AM
Replies: 13
Views: 763
Posted By Kuromori

I've made a few too, although it doesn't need to...

I've made a few too, although it doesn't need to be a full 1" wide. It's not necessary to have a slot, you can drill multiple sets of holes, but more importantly, you can just measure where you want...
08-10-19, 10:47 PM
Replies: 11
Views: 935
Posted By Kuromori

Someone told him his picture was bad because it...

Someone told him his picture was bad because it was from the left side.
07-30-19, 11:53 PM
Replies: 27
Views: 1,874
Posted By Kuromori

With Reynolds, you had various grades of hi-ten...

With Reynolds, you had various grades of hi-ten A, B and AA and H.M. (high manganese), the predecessor to 531. Butting was invented prior to 531, so you had plain gauge and butted versions. Other...
07-27-19, 03:31 PM
Replies: 26
Views: 1,187
Posted By Kuromori

I can only imagine he made the crank creaking...

I can only imagine he made the crank creaking worse by trying to reinstall the cotter.
07-23-19, 11:02 PM
Replies: 33
Views: 1,582
Posted By Kuromori

Those chrome lugs sure make the frame look like a...

Those chrome lugs sure make the frame look like a supercorsa or superlegera.
07-22-19, 11:36 PM
Replies: 31
Views: 1,946
Posted By Kuromori

Demosdromic is pseudo-latin. It's not about...

Demosdromic is pseudo-latin. It's not about xenophobia, it's about playing up Euro-flair, even without any obvious historical basis (say derailer vs derailleur), just like people who think Asian...
07-22-19, 09:41 AM
Replies: 31
Views: 1,946
Posted By Kuromori

Thatís really not how desmodromique is used in...

Thatís really not how desmodromique is used in historical patents. Itís not a thing or an invention, itís an adjective describing not having an excess of degrees of freedom in the system (exact...
07-13-19, 06:05 PM
Replies: 70
Views: 5,387
Posted By Kuromori

I think for the last several years, every last...

I think for the last several years, every last place finisher and DNF was on a carbon-frame bike too.
07-10-19, 06:00 PM
Replies: 12
Views: 1,823
Posted By Kuromori

Overheating 753 just turns it into 531.

Overheating 753 just turns it into 531.
07-05-19, 06:27 PM
Replies: 13
Views: 863
Posted By Kuromori

Most seat posts, sans cheap seat pillars with a...

Most seat posts, sans cheap seat pillars with a separate clamp, don't have an exposed hole like that. Most posts have flutes above the clamping area, or at least have an end point. I only recall...
06-30-19, 08:29 PM
Replies: 38
Views: 3,007
Posted By Kuromori

I don't want to be too harsh, but it seems like...

I don't want to be too harsh, but it seems like he's doing a bit of making up his own argument for wide rims, then acts a bit bewildered when that's not why wide rims are used, then continues along...
Showing results 1 to 50 of 59
 


 
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