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Mystery frame with oversized headtube and downtube

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Mystery frame with oversized headtube and downtube

Old 01-06-13, 09:44 AM
  #1  
thenomad
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Mystery frame with oversized headtube and downtube

I picked this up a while back and just threw some old parts on it that were laying around. Sort of a "borrow me" bike for kids.
It's been repainted (maybe more than once?) but the details on this frame really made me wonder what it is.

Details:

It's very light as a frame (didn't weigh but i'd say 3lb, max 4) LARGE downtube, Square chainstays, Wishbone seatstay, Hydraulic guides only, gussetted headtubes, large seat post size and 34.8 seat tube clamp size, serial number on the disc tab, and the kicker is the oversized 1.5 headtube (not tapered).

Sort of seemd like it could be a higher end frame? Or maybe it is just a random offbrand that was made with odd spec?
(It had a Giant seat post clamp but not sure it that's original)
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Old 01-06-13, 10:51 AM
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That old fork has a 1.5" steerer?

Have no clue on it. Might want to get that rear hub fully seated in the dropouts though.
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Old 01-06-13, 12:50 PM
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No, the headset is a reducer to 1 1/8
Yes, the wheel is cocked, I'll fix it when I get to putting a chain on it.
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Old 01-07-13, 09:53 AM
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Are you sure it's a 1.5" headtube and not an internal 1-1/8"? If you pop the cups out, the internal diameter would be 44mm for an internal 1-1/8". A 1.5" headtube would measure 49mm.

Edit: My money is on it being 1-1/8". There doesn't look to be a whole lot more room inside the headtube- the steerer seems to be filling it out nicely.
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Old 01-07-13, 01:19 PM
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I'll look again, it did not have the internal beveling though. Just a straight walled head tube as you see it. The steer tube is 1 1/8 and has fat spacers around it, then the headset ring to space it down as you see it. I'll try to measure.
Maybe i'll take a nother pic as well.
Seems like some odd specs to be a simple bottom barrel frame, but also may just have had those due to marketing timing.
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Old 01-07-13, 04:11 PM
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I would put my money on giant or another Asian manufacture. The mediocre welds and reinforcements in the joints are similar to a giant frame that I have. If it were US made I think there would be more attention in these details. I would also bet the steerer is 1 1/8. There are not many suspension forks for 1.5 steerers. the only thing I can think of is a cannondale lefty. or pre disk brake old school stuff. bike looks solid enough though.
But my guess is that it came out of the Giant factory.
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Old 01-07-13, 04:34 PM
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Originally Posted by thenomad View Post
I'll look again, it did not have the internal beveling though. Just a straight walled head tube as you see it. The steer tube is 1 1/8 and has fat spacers around it, then the headset ring to space it down as you see it.
44mm semi-integrated zero-stack setup is straight-walled, since there are still cups to press in. Not like full-on integrated.

http://www.bikemongrel.com/site/uplo...pecs_rev_d.pdf


The wishbone seatstays, headtube gusset plates and top-of-toptube cable guides all look very Trek to me but I can't figure out which one it might be.
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Old 01-07-13, 08:28 PM
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yep. looked up the 1 1/8 zerostack, I was thinking it was not "integrated" but I just hadn't seen the zerostack closeup.

I'm thinking Giant too. That downtube is big, it used to be yellow.
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Old 01-07-13, 08:44 PM
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Think I found it
Giant ATX870, just with disc only.

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