On Monday, June 11, 2018 at 3:39:00 PM UTC-7, AMuzi wrote:
On 6/11/2018 2:20 PM, Hank wrote:
(Wow, 5 years since I last posted here? Time flies.)

I just bought an '88 Miyata 712 frame and fork, which should be arriving later this week. As I assemble parts, the big question left is whether that vintage of Miyata would have used an ISO/26.4 or JIS/27.0 crown race. Obviously, I can throw a caliper on it when it arrives, but I'm curious if anyone knows offhand.

TIA


Yes original spec is JIS format 27.0/ 30.0, a very standard
thing. Nice ones start at $20.

That said, yes measure it as the system is designed such
that to use a more expensive (i.e. Campagnolo) headset one
cuts to the 26.4/ 30.2 format and someone may have done that.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

Got the frame in the mail and measured, and it's ISO. There's still overspray on the crown race seat and inside the head tube, so no sign of milling. I found an '86 catalog and it lists the specs for the Team, Pro, and 912 framesets as being English BB, Italian headset, so they made the switch at or around that time. I have a Tange Falcon 250 on order.

Thanks for the reply!

-Hank