Ti Koga-Miyata

Phil B. said:

I was looking at a photo the other day of a Koga Miyata road frame
built with titanium. The method of joining the tubes wasn't exactly
lugs, but rather what looked like alloy (?) sockets. The seat-stays
had been bolted as well at top and bottom.
Is anyone aquainted with these bikes? Can anyone tell me about this
method for joining ti tubes?

By coincidence I spoke today to a former Ti Koga-Miyata owner, who at my LBS
was admiring his new Seven, that he had equipped with King Ti headset, D-A
10 S, carbon Easton handlebar etc etc.

He told me he had a lugged Ti K-M frame before and also told me that this
frame had too much flex. According to him it was a Ti frame with lugs.

Greets, Derk

Phil B. said:

Hi All -

I was looking at a photo the other day of a Koga Miyata road frame
built with titanium. The method of joining the tubes wasn't exactly
lugs, but rather what looked like alloy (?) sockets. The seat-stays
had been bolted as well at top and bottom.

Is anyone aquainted with these bikes? Can anyone tell me about this
method for joining ti tubes?

I believe the Ti tubes on those bikes were glued together under the
lugs. They were made before the technology of Ti welding became mature
and inexpensive.
GH

On Tue, 19 Oct 2004 17:52:53 -0400, "G. Huang"

gang@removethis_bell-labs.com said:

Phil B. said:

Hi All -

I was looking at a photo the other day of a Koga Miyata road frame
built with titanium. The method of joining the tubes wasn't exactly
lugs, but rather what looked like alloy (?) sockets. The seat-stays
had been bolted as well at top and bottom.

Is anyone aquainted with these bikes? Can anyone tell me about this
method for joining ti tubes?

I believe the Ti tubes on those bikes were glued together under the
lugs. They were made before the technology of Ti welding became mature
and inexpensive.

Titanium welding has been a mature and not very expensive tech for a
long time. It's more likely that Miyata was simply using the same
type of construction features employed on some of their other bikes
when they produced the titanium frames as a way to preserve apparent
feature continuity. I have a Miyata Elevation 1000 here, and its
steel tubes are joined in the manner that is described. It's as stiff
as I could ask for, and it was apparently ridden hard for quite a
while by its previous owner.

--
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Phil B. said:

Hi All -

I was looking at a photo the other day of a Koga Miyata road frame
built with titanium. The method of joining the tubes wasn't exactly
lugs, but rather what looked like alloy (?) sockets. The seat-stays
had been bolted as well at top and bottom.

Is anyone aquainted with these bikes? Can anyone tell me about this
method for joining ti tubes?

TIA
Phil

I have an older alloy Miyata Quickcross bike.
Made in Japan.
Like a road bike with flat bars (now) and V brakes and braze ons.
It is "Aluminum Pressurised Adhesive".
There is a little info around on this.
The seat stays are bolted at the top by the seat post bolt.
They seem to have perfected this frame joining technique using really
thin and light lugs.
Maybe they continued this with the ti frame.
There are advantages of no welding stresses and no heat treating
required.
There is not a sign of any crack in any of the the joints.
My favorite ride.

Rob

Pastor Eyesed said:

I have an older alloy Miyata Quickcross bike.
Made in Japan.

Koga is the name of the Dutch importer: Andries Koga. He imports Miyata
frames and they're marketed by him as Koga-Miyata.

Greets, Derk

Thanks for the info on the frame. It can be seen here:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=7298&item=7108056469&rd=1&ssPageName=WDVW
or
http://tech-geeks.org/tiny.php?url=1309

Phil