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forum
Bottom Bracket Thread
Am currently build up a 1974 Mercian as a Single Speed "about town" bike, new BB has landed but is really, really tight should my LBS have a tool to "ream"?
(Have tried Muckoff + Toothbrush + grease)
Si
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
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7 comments
I guess it could be a good excuse to visit Grant at Mercian, although we have a newish LBS new me so might try him first.
Oh, Fringe, will post pic when complete.
si
The thread on your Mercian will be a 1.37x24tpi.
Which is the standard british frame thread.
Raleigh used to use a totally different thread.
Your Mercian will not use that thread.
We would charge about £15 to Tap & Face a frame.
So unless you are in the centre of London.
You may find a comparable price at your LBS.
They will definately have the tools & knowledge.
Cheers guys
si
shouldn't cost you much to get your LBS to chase the threads and ream the ends. if the threads have rusted at all – not uncommon if the frame hasn't had a BB in for a while – then it'll need doing. don't force it!
Actually, you would only get this behaviour if the frame has a Raleigh bottom bracket shell and you're trying to fit a British/ISO BB. So it is unlikely that you have the wrong BB.
Are you sure your new BB has the correct sized threads?
I'd find a local frame builder if i were you, they will have the know-how as well as the tools..
post a pic. when yer done sounds like a nice retro town bike. ta.