Need help with a mystery Rossin frame please

[codydaniels]

I just picked up this Rossin Quattro frame and it is a mystery to me. Every Quattro frame I have seen with crimped tubing is white and red. This one seems to have been originally green and yellow. I have searched everywhere for anything on a Quattro frame in green and yellow and have found nothing. Can anyone shed some light on this one? When I purchased it the story I was told was that the seller used to purchase parts from the Rossin factory and this frame came with others he had purchased in this condition. Apparently Rossin sandblasted it then let it sit until sold. I can only assume they painted it the green yellow then decided they didn't like it or that they were not going to offer that color combination. It still has traces of green and yellow on various places and pink at the head tube. Also would you think it should have the Quattro fork? There are no serial numbers on this one only 58 stamped on the B/B. I have two other Rossins and none of them have serial numbers. I included a picture of a green and yellow frame and a Quattro for reference. Please note that although it is a Quattro frame the remaining decal on the chain stay is not Quattro. The overall weight as it sits is 3.5lbs.

I am trying to figure out it's original configuration so it can be put back to original. I have searched the internet and found nothing. Any help would be appreciated. Thank you.

 

[codydaniels]

Re: More pics

Some more pictures of frame

 

[codydaniels]

Re: Last pictures

Last ones and two reference photos

 

[jfarren]

I have one of those frames, I believe from the same seller and purchased in 2020.
Mine is almost identical to yours with exception of the paint. Mine just had a little blue left on it.
Every other detail that I can see including the size is identical.
I put a carbon 1 inch fork on it and used as many other light weight carbon parts as II could find.
I used a Campy Super Record 11-speed groupset on it and the weight was about 18.5 lbs.
Rode it for a few years without painting it because I was having too much fun on it to strip it back down and paint it.
It is now in the process of being painted. I will share when I am done.

 

[YourroyalHEINniss]

Hi y'all,

Relatively new on the road bike section.
Searching for retro-ish cyclocross bikes, I've come across this Rossin wannabe.
Since I do not seem to find an ongoing thread about identifying frames, I thought I'll give it a go on this one.

Does anyone have an idea, based on the framenumber, canti studs an visible details, what the origin of the frame was?
My only clue could be be a 7 digit number starting with an J could possibly be a TREK TX900.

Any help or forwarding this message would be much appreiated.

 

[non-fixie]

Hi y'all,

Relatively new on the road bike section.
Searching for retro-ish cyclocross bikes, I've come across this Rossin wannabe.
Since I do not seem to find an ongoing thread about identifying frames, I thought I'll give it a go on this one.

Does anyone have an idea, based on the framenumber, canti studs an visible details, what the origin of the frame was?
My only clue could be be a 7 digit number starting with an J could possibly be a TREK TX900.

Any help or forwarding this message would be much appreiated.

View attachment 900555

1981 Miyata, would be my bet. With a replacement fork.

 

[jfarren]

In my experience, Italian bikes of this vintage normally have an Italian threaded bottom bracket. I would check that first. This holds true for my 1983 Rossin. I believe the fork is a replacement. My Miyata built Univega of 1981 has an M cutout on the bottom bracket shell. Hope this helps.

 

[non-fixie]

I've looked at the Miyata and Koga-Miyata 1981 catalogues, and didn't find a match in either one. So it could indeed be a frame Miyata built for a third party, such as Univega, Mikado or Specialized.

Or, the cantilever bosses were a later addition to the frame. This could explain the absence of a brazed-on brake cable hanger, which the Miyata bikes with cantilever brakes had.

Bridgestone used a similar serial number format, but that would make this a 1974 or 1984 bike. Neither feels quite right.