You are reading a single comment by @jimmy_one-eyes and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@jimmy_one-eyes
Basically, JIS headsets came on Japanese and Taiwanese frames. There are a few exceptions, but a 1960s British bike is going to have a BSC (ISO) headset. If you want to be sure, just tap the crown race off and measure. Go gently and you won't damage anything.