You are reading a single comment by @coventry_eagle and its replies.
Click here to read the full conversation.
coventry_eagle-
Don't think that's 55, which comes with aluminium cup? 52 maybe?
Ah ok, that’s good, the ali cups I have put with the 55s might actually be ‘theirs’ then. I’ll need to look through again and see if I have any 52s. I don’t think I do now but probably have at some point in the past.
-
52 maybe?
BB-UN54 is the plastic NDS cupped contempory of BB-UN55. BB-UN52 seems to have been issued with either plastic or metal, not sure if that's a change over time or a difference between OEM and aftermarket.
M_V
gbj_tester
This plastic nds cup is from a Shimano bb right? A lower end one so a un55 most likely?
In my jumble of square taper bottom bracket I have quite a few un55s and two of these plastic cups, neither of the plastic cups will fit on any of the un55s I
havetried them on. It’ll fit on a un72 but that would defo have had a metal cup right?I notice that these plastic cups say on them ‘BC 1.37 x 24 73” so should these go with 73mm un55s and would 68mm ones have metal cups? My jumble contains mostly 68mm bottom brackets and only a couple of 73s so it’s possible I only tried it on 68s. I managed to find a few metal cups that are a good fit on the 68mm un55 main bodies.
Also, I noticed that the main body of Shimano bbs marked 68mm and 73mm are the same length. The axle is offset and I presume the nds cup would take care of the extra width in the shell. I always thought they’d be totally different.