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Can some one tell me what size the ball bearings are and how many go in each side?
Cheers
it'll be on the shimano website, in the technical documents section
yes in here:
http://techdocs.shimano.com/techdocs/index.jsp
make sure you pick front or rear and the correct hub
anhow likley to be 1/4" for rears and 3/16" for fronts. SJS sell good quality balls
All Deore have 18 x 1/4 inch bearings in the rear hub and 20 x 3/16 inch bearings in the front hub.
Simplybearings do a good range online too.
Buy this, [url= http://www.chainreactioncycles.com/Models.aspx?ModelID=16786 ]Park Tool Ruler.[/url] [img] 
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£8.99 Drop any bike bearing into it and it'll tell you the size, also measures spoke lengths with easy to follow guide.