SR Melt Forging Custom crankset
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SR Melt Forging Custom crankset
Just some pics of an early SR crankset I picked up recently. The crest on these is really neat. I want to build a frame around this stuff.
First time I've run into these chainring bolts - SR Silver Cotterless
First time I've run into these chainring bolts - SR Silver Cotterless
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I have the 3 arm version. They are purty. Mine has a chainguard 52/47
Last edited by juls; 01-30-18 at 04:30 AM. Reason: more info
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The three arm model with this crest was offered in a boxed luxury presentation format, similar to original Shimano DuraAce components.
Before putting it to service check carefully to see if it is made for two degree or for three degree taper. Many of the early Sakae Ringyo sets were done for three degree.
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The three arm model with this crest was offered in a boxed luxury presentation format, similar to original Shimano DuraAce components.
Before putting it to service check carefully to see if it is made for two degree or for three degree taper. Many of the early Sakae Ringyo sets were done for three degree.
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Last edited by juvela; 01-29-18 at 11:44 PM. Reason: claritude
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The odds are pretty strong it is two degree. In general, the ones with the three degree are variations of Silstar. Some of these were private labelled, IIRC. Do not know if anyone else made three degree cotterless chainsets...
One potential stumbling block to making use of the three degree sets is locating the correct spindles.
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The odds are pretty strong it is two degree. In general, the ones with the three degree are variations of Silstar. Some of these were private labelled, IIRC. Do not know if anyone else made three degree cotterless chainsets...
One potential stumbling block to making use of the three degree sets is locating the correct spindles.
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That is cool looking. Have seen the three arm but not that one. SR is seen lower range but did have some neat stuff and their quality increased with part of that being BMX in the 80s. Sheldon Brown does an explanation of countries beginning with a cheap offering for a decade or so, moving to quality for decade.... etc in stages that ends up being too expensive to continue or something to that effect. Just insert one of the old company names. It's interesting. Anywho, that's a nice looking set. And the chainring bolts as well.
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The three arm model with this image was offered in a boxed luxury presentation format, similar to original Shimano DuraAce components.
Before putting it to service check carefully to see if it is made for two degree or for three degree taper. Many of the early Sakae Ringyo sets were done for three degree.
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The three arm model with this image was offered in a boxed luxury presentation format, similar to original Shimano DuraAce components.
Before putting it to service check carefully to see if it is made for two degree or for three degree taper. Many of the early Sakae Ringyo sets were done for three degree.
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But I digress. Sorry for the off topic bump.
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Thanks rhm for this good point about interference/clearance.
Only encountered it once as a spanner twister. Ironically it was on a 1959 Cinelli fitted with Cinelli-Magistroni cranks and T.A. adaptor for Criterium chainwheels. Not a whole lotta residential space in thar...
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Came upon this fitting of a three-arm Custom the other day on a private-labelled Flandria frame from the '60's. Cycle domiciled in Poland.
As I remember it, launch was ~1974.
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Thanks rhm for this good point about interference/clearance.
Only encountered it once as a spanner twister. Ironically it was on a 1959 Cinelli fitted with Cinelli-Magistroni cranks and T.A. adaptor for Criterium chainwheels. Not a whole lotta residential space in thar...
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Came upon this fitting of a three-arm Custom the other day on a private-labelled Flandria frame from the '60's. Cycle domiciled in Poland.
As I remember it, launch was ~1974.
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Here's the 'compact double' version! As shown here, the 47t ring is placed so the teeth are on the outside. This allows the chain ring bolts to sit in the recess designed for them. But I've found it works better when the ring is reversed, with the teeth on the inside, so the heads of the chain ring bolts stand proud of the surface.
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Last edited by rhm; 01-30-18 at 06:00 AM.
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Thanks so much!
Looks like they were still copying Verot and Specta at this juncture in only cutting teeth from one side.
Later, top models joined the balance of the known universe and had their teeth cut from both sides of the stock.
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Thanks so much!
Looks like they were still copying Verot and Specta at this juncture in only cutting teeth from one side.
Later, top models joined the balance of the known universe and had their teeth cut from both sides of the stock.
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Whatever. I'm just happy we can get teeny tiny little chainrings that fit it!
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Last edited by rhm; 01-30-18 at 09:03 AM.
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Always much appreciate any and all notices regarding modern available spares which fit annuated componentry. An excellent resource to keep our vintage equipment in operation!
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Always much appreciate any and all notices regarding modern available spares which fit annuated componentry. An excellent resource to keep our vintage equipment in operation!
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Great pics! Feel free to hijack with modern chainring discussion
When were these cranks new? Early/Mid/Late 70s? Did the 3 arm come before or after the 5?
When were these cranks new? Early/Mid/Late 70s? Did the 3 arm come before or after the 5?
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These are good questions!
From what I have seen and worked with the earliest SR chainsets were three-arm Silstar variants whose outer chainwheels are swaged to the right crank arm. These included alloy cottered models. Would think launch mid-to-late sixties but do not know a hard date. Other readers are sure to know more precisely.
Five-arm models seemed to appear later, beginning 1970-ish.
The many iterations of SR chainsets through time can be seen pretty well at VB.
https://velobase.com/ListComponents.aspx?Category=115
There is a relatively late Sakae Ringyo catalogue from 1980 housed here:
https://cyclespeugeot.web.fc2.com/rem...ce/sakae80.htm
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What is the difference between "Melt" and "Regular", as we know, aluminum forging?
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There was a thread on that once, many years ago:
https://www.bikeforums.net/classic-v...st-forged.html
What we learned, from the 1992 Bridgestone Catalog (https://sheldonbrown.com/bridgestone/1992/1992.pdf):
"MELT-FORGING is high-pressure casting, in which molten Ac4c-T6 aluminum (tensile strength
approx. 32,714 psi) is forced into a mold under roughly 11,378 .4 lbs. of pressure. This eliminates ,
bubbles much faster and more economically than in gravity-casting. The "forged" piece is then
cooled quickly with water. To compensate for the lower strength Of Ac4c-T6 (only 50 percent of
typical. crank cold-forging alloys and 75 percent of crank gravity-casting alloys), the parts tend to be
chunkier . Since Ac4c-T6 cannot be anodized, melt-forged parts never display the fine finishes
possible withhot-forgings, cold-forgings, or gravity-castings . Still, melt-forging has made relatively
lightweight, attractive, reliable components affordable to people who would otherwise ride steel."
https://www.bikeforums.net/classic-v...st-forged.html
What we learned, from the 1992 Bridgestone Catalog (https://sheldonbrown.com/bridgestone/1992/1992.pdf):
"MELT-FORGING is high-pressure casting, in which molten Ac4c-T6 aluminum (tensile strength
approx. 32,714 psi) is forced into a mold under roughly 11,378 .4 lbs. of pressure. This eliminates ,
bubbles much faster and more economically than in gravity-casting. The "forged" piece is then
cooled quickly with water. To compensate for the lower strength Of Ac4c-T6 (only 50 percent of
typical. crank cold-forging alloys and 75 percent of crank gravity-casting alloys), the parts tend to be
chunkier . Since Ac4c-T6 cannot be anodized, melt-forged parts never display the fine finishes
possible withhot-forgings, cold-forgings, or gravity-castings . Still, melt-forging has made relatively
lightweight, attractive, reliable components affordable to people who would otherwise ride steel."
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I've got a set of these on the way and I have a few questions. I found the FSA 27t chainrings. The come in steel and alloy. I was wondering if I should go with the steel chainring for durability?
The other technical issue is the chainring bolts which are not original and too long. Is there anything specific to the original bolts, or can I just file the replacements to leangth?
Third question is gearing. This is starting as a 52-40t and I'll be going down to a 40-27t. Any recommendations for 6-7 speed gearing. I'm generally riding in the flat lands, but hopefully will riding hilly areas next summer. Thanks
The other technical issue is the chainring bolts which are not original and too long. Is there anything specific to the original bolts, or can I just file the replacements to leangth?
Third question is gearing. This is starting as a 52-40t and I'll be going down to a 40-27t. Any recommendations for 6-7 speed gearing. I'm generally riding in the flat lands, but hopefully will riding hilly areas next summer. Thanks
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This is something I've wondered as well. My thinking is that steel chain-rings will last longer but would be harder on your chain and if not replaced regularly, a worn chain would wear the rear cogs faster. I have bikes with steel chain-rings, but I don't ride them hard.
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This is something I've wondered as well. My thinking is that steel chain-rings will last longer but would be harder on your chain and if not replaced regularly, a worn chain would wear the rear cogs faster. I have bikes with steel chain-rings, but I don't ride them hard.
And the fewer teeth the more this matters.
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When this set came packaged for retail sale it appeared in a presentation carton the interior of which was coated with a velvet look layer.
Can recall seeing one in the display case o' me local ~1973-74.
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When this set came packaged for retail sale it appeared in a presentation carton the interior of which was coated with a velvet look layer.
Can recall seeing one in the display case o' me local ~1973-74.
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Here's another one: Ebay listing
Last edited by bark_eater; 10-12-20 at 11:17 AM.