hazetguy 

I've been trying to find info or any pics about these 'unusual' Dura - Ace brake cable clamps, of which I have three.
They are stamped "DURA-ACE" and are chromed steel (magnetic). The thing, to me, that makes them unusual, is that instead of the "bulge" for the cable being on top, it is located on the side, down very low, on what would be the along almost the underside left side of the top tube when installed and being able to read "Dura-Ace" from the saddle, at the area for the securing hardware. I think it's an interesting area to run the cables.
Has anyone seen these before, or know what bike(s) or Dura Ace era or "group" they were part of? I haven't found any similar online.

T-Mar

The earliest reference that I have for them is 1977 as 'KA-0210 Outer Band' but there isn't a "NEW" designation, so they may go back to 1976. The 1975 catalogue shows the KA-210 as being a traditional style clamp. They go forward to at least 1980. They were likely discontinued some time in the early 1980s, as by that era brazed-on tunnels were pretty much standard on 600EX and Dura-Ace EX level bicycles. They would have been used on both 1st generation Dura-Ace and 2nd generation Dura-Ace EX. They are also shown for use on 600 and 600EX. Sorry no scans, as my printer/scanner is out of commission.

juvela

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no mention of size is made

bring it up as there are special oversize Dura Ace brake cable clips made for the Teledyne


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hazetguy 

Regarding size: I had presumed that they were for typical top tube diameter. Nope, they are way too small.
When I compress them by hand, and there is about a 2-3mm gap where the screw would pass through, the approximate inside diameter of the clamp is 24mm.
Does that help at all, or just add to the mystery?

PatTheSlat 

Possibly sized to go on the chainstay?

T-Mar

A 2-3mm gap at the screw mounting would be typical for a mounted and tightened brake cable clamp on an imperial (1"/25.4mm) top tube. If you could tighten them to where there was no gap, they wouldn't actually clamp to the top tube and would move around on the tube. To properly clamp to a 1" diameter tube, the unmounted, fully compressed diameter of the clamp would be slightly smaller by ~1mm. This would leave an ~3mm gap at the clamp ears. The catalogues specify 1" clamp diameter. (i.e. manufactured for a 1"/25.4mm imperial top tube). I'll got to the library or get a friend to scan the catalogue entries.

bikemig 

I have a set of cable guides like this with the cable running on the side that came on a Fuji Finest I picked up. I don't think they're dura ace but I'll check when I get home. I like the cable on top better but they're kind of cool.

T-Mar

Here's the entry in the 1977 catalogue. There's no change though 1980, except for the part number, which was changed to the new numbering ssytem.

juvela

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Screw type with opening for cable on the side are somewhat unusual in my experience.

Most of the ones which hold the casing in this position are spring type, often seen on three-speeds.

24mm would be an odd size. Smaller than 25.4mm/1" are manufactured but they are smaller than 24.

Thanks for the great information @T-Mar!

This has been an interesting thread to follow.

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bikemig 

I have a set of side cable guides that came to me on an early 70s Fuji Finest. They are not marked dura ace and they are obviously not original to the bike. The bike did come with first gen dura ace brakes. The first time I saw guides like this was on this bike; the second time was this thread.

juvela

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Thanks for this post and image Miguel!

These appear to hail from the same source as the ones which come on machines fitted with D-C arrestors.

Have never known if actually produced by D-C, or more likely a product done by a subber.

@T-Mar is sure to know.

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