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Help identifying mystery frame

Old 01-03-24, 11:53 AM
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Help identifying mystery frame

I recently acquired this project, but cannot figure out what this frame is. It has some interesting details and many layers of paint. No decals or headbadge remain.

Details:
26.8 seat post
Fork is drilled and threaded only on the back
Serial number SL527577
Suntour gt III dropouts
Ishiwata fork, stamped 5 I

Some parts include Bronzed anodized dia compe levers and cantis, sugino GP cranks (bronze anodized rings?), suntour thumb shifters and suntour xc sport derailleurs. strong seatpost, anodized Araya rims on suzue hubs.

Bought in ontario, canada if that helps.
any ideas?

Last edited by Craigorock; 01-03-24 at 12:29 PM.
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Old 01-03-24, 12:08 PM
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Sorry, but your pictures stay postage stamp size, won't enlarge.
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Old 01-03-24, 12:15 PM
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Fixed pictures, I think.
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Old 01-03-24, 02:36 PM
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interesting and have no help BUT the guy who knows most about serial numbers, especially if this bike hailed from Canada, is T-Mar so the fact you include the serial number is a big clue.
You don't see many MTBs with lugs and these look like BCM headlugs (but probably copies from Asia since IDK if Bocama ever made lugs for MTBs), also the SunTour DOs with double eyelets also a bit unusual (regular GT model had single eyelets) ditto an Ishiwata unicrown fork and the stem with cable hanger
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Old 01-03-24, 03:26 PM
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I don't have any help with the frame ID, but I can say without much doubt that those "bronze anodized" parts are not bronze, but UV faded black. I have a bunch of parts in the bins with the same look, and they are all cheap Chinese black anodizing that suffer from UV fading. I never saw anyone doing bronze anodizing on quality parts back in the era from this bike. Any part that has turned that bronze color is probably a low end component.

I do think that rear brake bridge will probably be the part that will eventually let us know what the bike is.
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Old 01-03-24, 10:35 PM
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Originally Posted by purpurite
I...they are all cheap Chinese black anodizing that suffer from UV fading. I never saw anyone doing bronze anodizing on quality parts back in the era from this bike. Any part that has turned that bronze color is probably a low end component.
In my experience it's ANY black anodizing (from China or USA, Germany...any) that will fade to become something "bronze-y" or "purple-ish", or even "green".
Because it's the dyes used to color Aluminum Oxide (AKA "anodizing") which are never 100% light-fast and will eventually fade to reveal what extra-dark shade of (brown, purple, green) dye was used to achieve "black".
All colors in anodizing are due to dyes, and nearly all dyes used are "fugitive" to some degree.
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Old 01-04-24, 09:03 PM
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You might find some information by perusing the Asian Serial Number data compiled by @T-Mar
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Old 01-04-24, 10:46 PM
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Originally Posted by obrentharris
You might find some information by perusing the Asian Serial Number data compiled by @T-Mar
Brent
So you night think, but my tiny brain just cannot decipher the code that T-Mar (obviously) spent so much time concocting...I try to put something like the OP's serial number (SL527577) into the blender and have NO idea what "SL XXXXXX" tracks to either "F M Y mm y yy" let alone what difference it means when the letter codes are boldfaced or not...

So you tell me: what do you think "SL527577" means and for extra points how did you figure it out based on T-Mar's guide?
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Old 01-04-24, 11:40 PM
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Originally Posted by unworthy1
So you night think, but my tiny brain just cannot decipher the code that T-Mar (obviously) spent so much time concocting...I try to put something like the OP's serial number (SL527577) into the blender and have NO idea what "SL XXXXXX" tracks to either "F M Y mm y yy" let alone what difference it means when the letter codes are boldfaced or not...

So you tell me: what do you think "SL527577" means and for extra points how did you figure it out based on T-Mar's guide?
Bold font = coded alpha or numeral. Caps = alpha. Lower case = numeral. S/n format of subject bike resembles built-in-85 Fuji, although T-Mar's guide does not explicitly list S code.

Wild guess: 86 model year Fuji Blvd XC with some parts changed out. Would have been all black originally.
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Last edited by Insidious C.; 01-04-24 at 11:53 PM.
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Old 01-05-24, 07:56 AM
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I struggled with decyphering the serial number as well.
After looking at many, many pictures online, I now believe it is a norco sasquatch from 1986-87 based on the braze ons and ishiwata tubing. Many of the components are dated '85.
it would be cool if it was built in '86 as I was born that year. Anyone willing to decoded that SN to confirm?
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Old 01-05-24, 10:39 AM
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T-Mar sent me this information via private message:
"Based on the serial number and fork's date code the subject bicycle is a 1986 model manufactured in very late 1985. This serial number format has been seen on Norco from this period but it is not a Sasquatch, which used Tange tubing, the tri-pulley version of the SunTour XC Sport rear derailleur, a Shimano B-124 crankset and separate bars and stem. The Ishiwata, standard XC Sport, Sugino GP crankset with bronze chainrings and the bull-moose handlebars are indicative of the 1986 Norco Pinnacle, which was one step below the Sasquatch."

Also this photo:
"I forgot to include this with my previous PM. From the 1986 Norco catalogue:


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Old 01-05-24, 12:07 PM
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Very cool, thanks for the information everyone!

Last edited by Craigorock; 01-05-24 at 12:47 PM.
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Old 01-05-24, 12:21 PM
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happy that this ID mystery was solved, and thanks for what MIGHT be a step up for me in trying to grasp the mystery of the Asian Serial number decoder ring (but wouldn't bet on that just yet).
So to satisfy one minor detail, since this Norco was an Ishiwata frame and made in Asia, those headlugs must be Asian too, any clue as to who made those (Long Shen or...)?
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Old 01-05-24, 12:49 PM
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only difference from the catalogue pic I can see is that my rear drop outs have 2 braze ons, one for fenders and one for a rear rack. It doesn't look like there is 2 in the catalogue pic posted above.
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