Forum menu
Yep, hamfisted Dave has managed to damage the tread on the non-drive cup of my BSA XT BB.
Before anyone pipes up that I shouldn't be building bikes, leave it to the pro's etc; NO!, I can do it myself, I just made a mistake and got the spanner on it too soon, rather than putting it in hand tight and mullered it. It's a steel frame and nothing is damaged in the threads.
I know they're only £15-20, but it seems a proper waste when all I need is the cup itself.
Probably not, but I find one side tends to go grumbly before the other - so keep the undamaged one for future use.
I have a mix-and-match selection in my spares drawer from doing this over the years.
Have a look in SJS for BB spares.
I see they have the part you want in Hope flavour but then it costs £15 which can probably get a complete Shimano BB for.
Depending on how much you've mangled it, it might be fine once it's screwed all the way in.
Depending on how much you’ve mangled it, it might be fine once it’s screwed all the way in.
It's not damaged after the PTFE/Loctite that they fit, but I cant get it in that far as the thread is managled.
You could probably clean it up with a thread file but one would cost more than a replacement BB.
You could probably clean it up with a thread file but one would cost more than a replacement BB.
Any idea what the pitch is on a BSA thread?, where I do my classic cars is next to an engineering place, who'll probably lend me theirs.
Google leads me to a nice table...
https://en.wikipedia.org/wiki/Bottom_bracket#Shell_diameters_and_threading
Google leads me to a nice table…
https://en.wikipedia.org/wiki/Bottom_bracket#Shell_diameters_and_threading/blockquote >Thanks I did look earlier, couldn't find anything. Obviously using the wrong search terms. 🙂
Funny, was thinking of posting exactly the same. Have a bag full of right hand side shimano BB cups, happy to swap one for a left!