Thread: ISO, JIS crown race compatibility
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Old 03-18-18 | 07:41 AM
  #11  
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JohnDThompson
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From: Appleton WI

Bikes: Several, mostly not name brands.

Originally Posted by Chombi1
Really surprised me when the crown race on my Gitane TdF turned out to be 27mm when I changed out the Stronglight B10 headset on the bike to an all aluminum A9, about a month ago..... which leads me to think that the 27mm crown race spec can occur on BSC threaded headsets too...
Yes, that can happen:


Source: Sutherland's 4th Edition

I had to switch crown races with another A9 headset I had in my stash to make things work out on the Gitane....
Or mill the crown race seat to more standard 26.4mm diameter.
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