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Another rare Japanese frameset - Help ID this Zunow?

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Another rare Japanese frameset - Help ID this Zunow?

Old 10-12-15, 11:41 AM
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Another rare Japanese frameset - Help ID this Zunow?

After mistakenly assuming a previous owner had shaved down the lugs, the folks over at /framebuilders helped me figure out that this Zunow actually has some nice fillet brazing. It also has the beautiful hummingbird logos throughout.

Here's the previous thread:

https://www.bikeforums.net/framebuild...rame-safe.html

And here's the frame I picked up:



And I think it looked something like this, once upon a time:



The rear end looks different, obviously.

And here's the fillet brazing revealed after a light sanding:



So, how would I go about finding the model name or more history about this frame? Zunow catalogs are had to source, and I haven't yet found any pictures on the interwebs that show other Zunow frames exactly like this.

Any help appreciated.
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Old 10-12-15, 12:17 PM
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That's an interesting Zunow. The fillet brazed frame with the wishbone seat stay and the monostay low on the seat tube and carried to the top tube as a third triangle is different from any I've previously seen.
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Old 10-12-15, 12:17 PM
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What's the seat tube & head tube size on this? That looks like my size

I don't know how how you would identify that. I would suggest getting in touch Mr. Ooyama:Zunow on CR

One of the members here, I believe has talked with him. If I remember who, I will repost.

EDIT: Perhaps @Dawes-man knows how something (?).

Last edited by TimmyT; 10-12-15 at 12:22 PM.
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Old 10-12-15, 12:29 PM
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Here's a lugged version in the same configuration. It has the wishbone seat stays an the monostay carried through the seat tube to the top tube to form a triple triangle frame.

The wheels look like they may be 26" (650c).

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Old 10-12-15, 12:34 PM
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Oh, yeah. I saw a similar triple triangle in 26" or 650c. I bet that's what the OP's is.
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Old 10-12-15, 12:45 PM
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Cool! Thanks for the info.

Originally Posted by TimmyT View Post
What's the seat tube & head tube size on this? That looks like my size
Top tube is ~21.5" and seat tube is ~22.25" (c-to-c) which is somewhere around a 56-57cm. I have two other frame-up projects right now, so won't be keeping this one

Here's a better profile shot:



The head tube looks long, but that's not crazy considering the overall geometry of it. It also has internal cable routing, which I haven't seen one many (any?) other Zunows.

Thanks for any other info...
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Old 10-12-15, 12:49 PM
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Yeah, that's the side shot we needed. I ride a 24-25" seat tube, and if it was that size, we could probably work something out The 650c wheel size threw me off. 650c has an ERD of 571mm, so you can measure 285.5 mm from the axle location (or put a hub in the rear dropouts, and measure from the center) along the chain stays. At that point, measure across the stays. It should measure about 30mm, maybe a little less, but likely more than 25mm. That will give you an idea of the tire size this frame takes.
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Old 10-12-15, 12:51 PM
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Originally Posted by billytwosheds View Post
Cool! Thanks for the info.

Top tube is ~21.5" and seat tube is ~22.25" (c-to-c) which is somewhere around a 56-57cm. I have two other frame-up projects right now, so won't be keeping this one

Here's a better profile shot:

[IMAGE]

The head tube looks long, but that's not crazy considering the overall geometry of it. It also has internal cable routing, which I haven't seen one many (any?) other Zunows.

Thanks for any other info...
With that long head tube and the very low wishbone on the seat stays, I'll bet it's built for 650c (or possibly even smaller) wheels.

Did you get a fork with the frame? If so, what's the crown-to-axle measurement?
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Old 10-12-15, 12:54 PM
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Originally Posted by TimmyT View Post

I don't know how how you would identify that. I would suggest getting in touch Mr. Ooyama:Zunow on CR
Unfortunately, the Zunow website seems to be down, and I can't find an email contact for Mr. Ooyama.

Originally Posted by Scooper View Post
Here's a lugged version in the same configuration. It has the wishbone seat stays an the monostay carried through the seat tube to the top tube to form a triple triangle frame.

The wheels look like they may be 26" (650c).

Oh, that's so helpful. Thanks Scooper.
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Old 10-12-15, 01:00 PM
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Catnap:

https://www.bikeforums.net/classic-vi...ast-japan.html

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Old 10-12-15, 01:05 PM
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Originally Posted by Scooper View Post
Did you get a fork with the frame? If so, what's the crown-to-axle measurement?
Yep, fork came with the frame, and looks like original black paint on it. Will post an image after work.

I measured ~340mm from the base of the fork crown to the axle. Tried dropping it onto a 700c wheel, and the fork is too short (obviously).
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Old 10-16-15, 01:38 PM
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@billytwosheds - got your message. looks like this might be their "Trionic" model, which was made for 650C wheels. The style of rear triangle was called "Pierce WR" referring to the way the wishbone monostay goes through the seat tube to create a triple-triangle style bike. If you look at the picture Scooper posted, that's what the decal near the seat cluster says.

See this pic from Bikeforums user DawesMan:


given that it's fillet-brased, i'd assume that your frame was probably a one-off custom. Zunows are well-known for their unique lugs and i've never seen a fillet-brased steel Zunow before. I don't know where you got your frame, but in the late 80's - early 1990's Zunow was focused on the triathlon market in Canada & the USA. This frame may have been custom made for a customer during that time period.

It may also be a 24" wheel version:
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Old 10-17-15, 04:15 AM
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P
Originally Posted by Scooper View Post
Here's a lugged version in the same configuration. It has the wishbone seat stays an the monostay carried through the seat tube to the top tube to form a triple triangle frame.

The wheels look like they may be 26" (650c).

Is it just me or does that chainring look huge?
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Old 10-19-15, 01:30 PM
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Originally Posted by Catnap View Post
given that it's fillet-brased, i'd assume that your frame was probably a one-off custom. Zunows are well-known for their unique lugs and i've never seen a fillet-brased steel Zunow before. I don't know where you got your frame, but in the late 80's - early 1990's Zunow was focused on the triathlon market in Canada & the USA. This frame may have been custom made for a customer during that time period.
Thanks for following up, Catnap. The frame came over from Japan as far as I know, which is somewhat common for multi-generational families here in Hawaii. Probably came over and ridden, then left for a family member to sell off. Kind of neat to hear that it's likely a one-off custom, too.

The frame has remnants of a botched paint removal, which I'll probably have to perform again, then an oxalic acid bath. Too much sanding for me

Thanks for the followup! Will ping back on this thread if I find out anything more.
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