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Search: Posts Made By: Kuromori
Showing results 1 to 50 of 494
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Forum: Framebuilders
02-24-20, 11:44 PM
Replies: 11
Views: 290
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: 8
Views: 172
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: 11
Views: 297
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: 22
Views: 409
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: 800
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: 8
Views: 172
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: 22
Views: 409
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: 22
Views: 409
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: 23
Views: 319
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: 1,267
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: 1,267
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: 1,267
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: 1,267
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: 487
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.
02-14-20, 07:49 PM
Replies: 50
Views: 1,914
Posted By Kuromori

Just look up tempering graphs that start from "as...

Just look up tempering graphs that start from "as quenched" as 0 for any hardenable steel. Some graphs will skip the lower temperatures because these temperatures are basically useless in practice as...
02-14-20, 07:07 PM
Replies: 7
Views: 770
Posted By Kuromori

These are auto generated websites that steal...

These are auto generated websites that steal images and descriptions off the internet. Prices are usually determined by offering a discount compared to whatever listing they're ripping off, ideally...
02-14-20, 06:56 PM
Replies: 50
Views: 1,914
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...
02-13-20, 12:54 PM
Replies: 50
Views: 1,914
Posted By Kuromori

Bicycle frames inevitably end up with stress...

Bicycle frames inevitably end up with stress risers, which is almost always where fatigue failures occur. It's not the entire frame that's fatiguing, it's spots with high localized stresses. It...
02-12-20, 02:12 PM
Replies: 50
Views: 1,914
Posted By Kuromori

I'm not even sure how you could tell there was...

I'm not even sure how you could tell there was frame flex on that. Especially with the bungee instead of kickstand-like chainstay clamp ones.
02-12-20, 12:25 PM
Replies: 50
Views: 1,914
Posted By Kuromori

To be pedantic, steel frames do fatigue, so they...

To be pedantic, steel frames do fatigue, so they do "wear out" in a sense. People often don't get this because steel frames can often last a lifetime or two without any failure, and they often die...
02-12-20, 08:53 AM
Replies: 29
Views: 458
Posted By Kuromori

You should in general avoid a bottom bracket (BB)...

You should in general avoid a bottom bracket (BB) marked ISO unless you know you actually need ISO. Most modern things use JIS, especially Japanese things. ISO continues to be made mostly as legacy...
02-12-20, 08:51 AM
Replies: 29
Views: 458
Posted By Kuromori

Golden Arrow parts has 105 for the numerical part...

Golden Arrow parts has 105 for the numerical part of the part number and had the shimano part prefix. Later 105 has the form 105X, and even later 105 had the form 5XXX, and current is R7000. RD for...
02-12-20, 08:33 AM
Replies: 29
Views: 458
Posted By Kuromori

It's probably worth noting that BBs labeled "ISO"...

It's probably worth noting that BBs labeled "ISO" usually mean "ISO" taper and not threading, and should generally not be paired with JIS taper which is the current norm.
02-12-20, 07:32 AM
Replies: 11
Views: 460
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: 408
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
02-04-20, 12:06 AM
Replies: 7
Views: 317
Posted By Kuromori

The traditional way to deal with fenders on bikes...

The traditional way to deal with fenders on bikes with adjustable CS length is just to suffer poor fender line and hope it doesn't look too offensive. Personally not a fan on adjustable CS length on...
02-03-20, 11:45 PM
Replies: 7
Views: 184
Posted By Kuromori

If you're just trying to get to the wheel...

If you're just trying to get to the wheel bearings, you just pull out the dust cover. There's generally little need to service freehubs except flushing them out if they're gummy and oiling them when...
Forum: Framebuilders
02-02-20, 09:54 PM
Replies: 6
Views: 394
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...
02-01-20, 08:32 PM
Replies: 67
Views: 3,063
Posted By Kuromori

Well Shimano was in Japan making anodized...

Well Shimano was in Japan making anodized aluminum parts and still mostly chroming their low end stuff except for the rare black skylark, and making Black DA in 1975 or so, as an alternative option...
Forum: Framebuilders
01-31-20, 05:35 PM
Replies: 7
Views: 317
Posted By Kuromori

If the brake is tucked inside the rear triangle,...

If the brake is tucked inside the rear triangle, you shouldn't have any problems due to discs. If it's SS mounted, it might give you problems with the stays.

First thing to consider is if you have...
01-31-20, 05:02 PM
Replies: 67
Views: 3,063
Posted By Kuromori

Seems to me the ideal finish is Rustoleum rattle...

Seems to me the ideal finish is Rustoleum rattle can silver. Unlike polished aluminum, it's weather resistant. Unlike black if it gets scuffed, it's still silver on silver. Unlike clear anodizied...
01-31-20, 04:24 PM
Replies: 67
Views: 3,063
Posted By Kuromori

It does explain why all those top shelf black...

It does explain why all those top shelf black quill stems were so cheap compared to their polished counterparts, and why they were so undesirable during the period and everyone hated those ugly super...
01-31-20, 04:13 PM
Replies: 10
Views: 279
Posted By Kuromori

I think it's part of the design of all these...

I think it's part of the design of all these one-way friction shifters. The screw creates friction on the inner bushing, but does not meaningfully compress it, it just sets the friction in the...
01-31-20, 03:58 PM
Replies: 25
Views: 809
Posted By Kuromori

I'm not really sure about the machine thing. I...

I'm not really sure about the machine thing. I haven't thought too hard about it, but many factory videos show wheels being laced partially by hand. It may have more to do about work flow and just...
01-31-20, 03:37 PM
Replies: 67
Views: 3,063
Posted By Kuromori

People think black looks cool just like in the...

People think black looks cool just like in the 80's, and black is even more of a status symbol now because carbon fiber is black. Aluminum can be painted or anodized black more easily than carbon can...
Forum: Framebuilders
01-30-20, 11:27 PM
Replies: 20
Views: 460
Posted By Kuromori

It has nothing to do with the stay. It just...

It has nothing to do with the stay. It just happens to kind of look like a stay. Completely ignore stays. Stays are a red herring.

As the label indicates, it's entirely about dropout thickness....
01-30-20, 11:19 PM
Replies: 21
Views: 643
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, 05:11 PM
Replies: 25
Views: 809
Posted By Kuromori

Sheldon has a page on whether or not the trailing...

Sheldon has a page on whether or not the trailing spokes should be heads in or heads out. I'm sure Jobst has his own opinions. Getting the hub/rim alignment right is about focusing on clusters of 4...
01-30-20, 03:11 PM
Replies: 35
Views: 980
Posted By Kuromori

Using a hook wrench is about 95% buying a decent...

Using a hook wrench is about 95% buying a decent hook wrench and about 5% common sense. Unfortunately most bicycle hook wrenches are pretty bad and you may very well do less damage with channel locks...
01-30-20, 02:42 PM
Replies: 21
Views: 643
Posted By Kuromori

15mm of FC change simply isn't big enough to deal...

15mm of FC change simply isn't big enough to deal with scaling of the top tube though. It's pretty common for wheelbase/FC to shorten with size since it's what happens if you shorten reach/TT length...
Forum: Framebuilders
01-30-20, 01:08 PM
Replies: 9
Views: 334
Posted By Kuromori

There's not much drawback to just having longer...

There's not much drawback to just having longer chainstays or room for bigger tires though unless the short wheelbase handing is really important though. Longer chainstays with wide tire clearance...
01-30-20, 03:13 AM
Replies: 35
Views: 980
Posted By Kuromori

It's just a lowly BSA lockring. It's not even the...

It's just a lowly BSA lockring. It's not even the BB cup. It's hardly the end of the world if it gets a bit marred, or a couple notches get screwed up. It's not some irreplaceable piece of history or...
01-30-20, 03:06 AM
Replies: 21
Views: 643
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: 643
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: 334
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...
01-29-20, 06:41 PM
Replies: 18
Views: 1,035
Posted By Kuromori

If you can get it to clear a 36, then it will be...

If you can get it to clear a 36, then it will be on a 1x with the chain just the right length to maximize clearance in the biggest cog. How many of those people tried to set it up as a double? To get...
01-29-20, 06:29 PM
Replies: 35
Views: 980
Posted By Kuromori

Channel locks are easier if you plan on mangling...

Channel locks are easier if you plan on mangling it anyways. You don't even really need the pin spanner to remove if the cup isn't seized. The pin spanner is more for holding it in proper adjustment...
Forum: Framebuilders
01-29-20, 05:46 PM
Replies: 20
Views: 460
Posted By Kuromori

The problem is that what Shimano is trying to...

The problem is that what Shimano is trying to convey can't be conveyed with a diagram of a "normal" looking steel dropout where the axle/hanger faces are in plane. It has to look unusual to...
01-29-20, 01:54 AM
Replies: 28
Views: 420
Posted By Kuromori

With the exception of Sapim D-lights, most spokes...

With the exception of Sapim D-lights, most spokes will run out of thread if they're too long. It's not a matter of them sticking out too much, taking a 12mm nipple and a spoke I had lying around, it...
01-29-20, 12:29 AM
Replies: 38
Views: 2,513
Posted By Kuromori

I have a super-plate that I'm too lazy to check...

I have a super-plate that I'm too lazy to check at the moment, but if I remember correctly, it's basically a duopar except with patent dodging and the tension spring tidily tucked away inside the...
Showing results 1 to 50 of 494
 


 
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