Bottom Bracket Thread

by canyonsi   January 11, 2010  

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

7 user comments

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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.

Fringe's picture

posted by Fringe [1081 posts]
11th January 2010 - 17:19

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Are you sure your new BB has the correct sized threads?

two wheels good; four wheels bad

posted by cat1commuter [1300 posts]
11th January 2010 - 17:46

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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.

two wheels good; four wheels bad

posted by cat1commuter [1300 posts]
11th January 2010 - 17:55

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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!

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posted by Dave Atkinson [7028 posts]
11th January 2010 - 18:23

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Cheers guys

si

http://sinaicycle.blogspot.com

2010 - Cheshire Cat / Dragon Ride

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posted by canyonsi [42 posts]
12th January 2010 - 13:54

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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.

DrugsAreBad.!!

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posted by bicycleworld [26 posts]
12th January 2010 - 15:48

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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

http://sinaicycle.blogspot.com

2010 - Cheshire Cat / Dragon Ride

canyonsi's picture

posted by canyonsi [42 posts]
13th January 2010 - 9:22

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