Originally Posted by
samuelstemarie
Hi guys,
Im redoing a Sekine (japanese bike made in Canada) and I wanted to change the old bottom bracket system with a sealed one. However, its a 70 mm with an english thread. Those are impossible to find (70 are always intalian thread).
What is the best solution (I would like to avoid to have it faced) to fit a 68 mm or a 73 mm ? Have someone had try any of those and what was the results ?
Thanks
Maybe there's a threadless BB (as in repair one with angled lockrings) made for a 70mm shell out there. But since I have the facers it would take about as much time to search for said BB as to face down the current 70mm to 68mm. Then I would have a lot of options now and for years to come.
If you try a 73mm one just make sure that the tread engagement is enough. Some modern BBs don't have a lot of thread on the fixed side.
BTW the Sekines were manufactured in Japan and only assembled in Canada (to skirt tariffs). Andy