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Hello all. I bought a bike at the thrift the other day. Some people thought that it might be a Tom Kellogg / Spectrum, but he didn't claim it. Darn, so I am casting a wider web to you all. Serial number: CL90006. 17" frame, down tube cable routing, integrated seatpost clamp, no bridge between the chain stays, no hole for the spring on the brake bosses, and a rounded arch for the brake cable stop for cantilever brakes.
all thoughts and clues are appreciated
Charlie
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We need to see the drop outs. I'm going to go with first year issue Marin Team Titanium. Those welds though. Below you can see the similarities. on a later frame. Marin was using that rear cable stop at least back to 1989, and that year they had a U brake on the seat stays.

 

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A pic where you could actually see more than a little bit of the frame at a time might help.

Just as guess based on the serial number, a few frame details and the ugly welds, could be a Clark Kent?

 

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After the new pics, I'm definitely leaning toward 'not titanium'. The dropouts look forged and not machined, and the chatter marks from mounting the wheel wouldn't be present in properly alloyed titanium. I'm still thinking stainless. Either that, or some non-standard Ti alloy.
 

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Stainless would also fail the magnet test. I agree that it doesn't look Ti.
However there are virtually no stainless MTBs out there. It makes a Ti frame look like a Huffy.
 

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most stainless isn't magnetic, not a good test
There are three types of stainless steel, Ferritic, Austenitic and Martensitic. The alloying element mix determines they type along with intended use. Ferritic stainless is magnetic and will rust under the right conditions due to the iron as the main alloying element. It also has very low nickel content. It’s commonly used for automotive exhaust systems. I would think the frame would be heavy if it were made from stainless steel.
 

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Discussion Starter · #16 ·
Great info on stainless steel being non-ferrous. I remember a KHS comp that was steel and looking like Ti. I thought that I saw some reddish stuff (possible rust) in the head tube. I even knocked out the cups to see, but it was only tired old grease. I lean to the stainless idea when I hold the frame only, as it isn't the lightest, but go back to the Ti idea when I feel the stiffness of the rear triangle.
 
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