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@A_EF
Thanks guys. I think your Koga frame is a bit nicer than the 50 year old Dawes (salvaged from scrap) I'm trying to sort out and probably more worthwhile spending the money on the Dura Ace for your bike. Aren't the Koga frames Alloy? I was hoping someone would chip in and say I'd be fine with the extra 0.2mm on an old worn steel frame.
Might be cheaper to get the head tube reamed in the long run. Then use 27mm crown race with ISO headset.. which I'm still assuming will sit ok?
Read lots of mixed opinions in the last few days. Some people saying they've fitted ISO into JIS and been fine (mostly steel frames) and other stories of cracked head tubes (on alloy frames).