old trials fanatic Posted December 12, 2013 Report Share Posted December 12, 2013 Hi just wondering if anybody knows the size of taper roller bearings that will be required to fit an Ossa Mar 1977 ish ? thanks Quote Link to comment Share on other sites More sharing options...
amo Posted December 12, 2013 Report Share Posted December 12, 2013 (edited) I've just put a set in a TR77, I used 30204...... same for all the 'classic' ossa frames I believe Edited December 12, 2013 by amo Quote Link to comment Share on other sites More sharing options...
woody Posted December 13, 2013 Report Share Posted December 13, 2013 Yes, they all use 30204 Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted December 13, 2013 Author Report Share Posted December 13, 2013 Thanks guys i'll make a note of it and nip down the local suppliers Quote Link to comment Share on other sites More sharing options...
trialsrfun Posted December 13, 2013 Report Share Posted December 13, 2013 30204 taper roller bearings are correct for your OSSA & a direct replacement for the angular contact type that may have been fitted when the bike was new. Have you removed the old bearing outer races yet? There is little or nothing much of a shoulder on the bearing outer ring to tap against using a hammer & punch. One way to remove the old outer rings that I am told works very well indeed is to run some arc weld onto the inner bearing face of the bearing outer, this shrinks the outer race causing it to almost fall out of the headstock. 2 Quote Link to comment Share on other sites More sharing options...
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