Technical & Reference Section > Tech and Restoration

bearings, cups and sizes - needing some help !

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BENDYCAT ELEVENTEEN:
Right just doing up some bearing cups for my redline cranks
I think these came from a late 80's/90's set

cups are slight dome and have the redline decals (half over style) each side on the face of the cups

the bearing that are in there at the mo are gone - but they are 6904 DU

I'm trying to clean them up and polish the cups and stick them with a new set of '09 redline 180 cranks

the Old axle and the new axle are finding it difficult to go into the old bearing just to check it, as it's fricking tight  ???

my question is - can some one help me find some new bearing for the old cups that will fit - as I have seen some 6904 but they have a different code at the end of the number ? is this a different diameter on the inside ?

please can any one help ?

cheers B  :angel:

Oldboyburner:
Ge in touch with retrorich78 his mate makes bearings billy

BENDYCAT ELEVENTEEN:
Right think I have worked it out  :crazy2:

6904 is 20x37x9mm

which means that I need shims like the one's already stuck in one bearing and the other is well stuck on the axle  :2gunsfiring_v1:

so please does any one have the two little shims that sit inside of the bearing to fill out on the 19mm axle - please  :angel:

BENDYCAT ELEVENTEEN:

rodriguez:


There's no sign of those shims on the redline site

http://www.redlinebicycles.com/components/bottom-brackets

This might be a cheap way to go if you can't find any

http://www.ebay.co.uk/itm/BMX-Bottom-Bracket-Counterfitt-Spanish-BB-19MM-Black-/400570674600?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item5d43df6da8

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