Tony, bearings have been supplied from European countries from year dot (SKF Sweden for instance) I think I'm right in saying that there is a mix of Imperial and Metric inside a Norton Gearbox. I also remember something odd about the OD and ID of the main gearbox bearing in my Matchless's. I guess these firms used the most readily available or cost effective at the time. Ron
Agreed Ron, I have worked on British bikes for years and some of the things they did defy logic at times. For instance my Triumph Daytona 500 (1970). I wanted to change the handlebar bolts. I had a BSA A50 the same year 1970, the forks were the same, in fact the whole front end was the same but the BSA had different threads for the handlebar bolts ???? explain that one.
Thanks for the offer but I am an engineer of 45 years and have access to machining facilities. I have all of the bearings now and just need to make the spacers.
