I have a square tapered BB that needs replacing it is a BB-UN40 110mm.
I have seen that CRC have either a UN26 or a UN54 but not a UN40. Does the number just denote the 'bling-ness' of the BB?
Any help would be appreciated.
Bike Forum
Difference Between bottom brackets
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Posted 8 months ago #
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There is also a 73 on the casing, which I assume to be the diameter of the casing.
Posted 8 months ago # -
73(mm) should be the BB width, as 68(mm) is the alternative
and yes I believe the bigger the number the better the quality in this case.
Shimano dropped a number of models a few years back. as HT II became more previlent.Posted 8 months ago # -
as above but 110 is the axle length in mm as well.
Posted 8 months ago # -
I've got one indoors brand new I think it's a 73/110 you can have it for postage - UN52 it is.
Posted 8 months ago # -
It's not really the blingness, it's more a reflection of the quality of the unit (bigger the number the better quality. Whether it lasts longer is always open to debate.)
73 will be the width of the bb shell the bottom bracket came out off. 110 (or 113 or whatever) will signify the length of the bb axle - always try to replace like with like unless you're fiddling with chainline.
Posted 8 months ago # -
Thanks for the info.
Joolsburger, if you could let me know that would be great, and what you are expecting for it.
e: stuart at me4pm co uk
Thanks
Posted 8 months ago # -
I'll check tonight I'm sure its a 73 110 - 2 quid to post I reckon.
Posted 8 months ago # -
The BB I have is a brand new 110 /73 so just what you need. £2.00 to cancer research and I'll stick it in the post.
J
Posted 8 months ago # -
I have sent an email to your hotmail account as listed in your profile.
many thanks.
Stuart
Posted 8 months ago # -
@joolsburger
You champion!
Posted 8 months ago # -
Should have arrived, let me know.
JPosted 8 months ago #
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