Hi just wondering if anybody knows the size of taper roller bearings that will be required to fit an Ossa Mar 1977 ish ? thanks

I've just put a set in a TR77, I used 30204...... same for all the 'classic' ossa frames I believe

Edited December 12, 201312 yr by amo

Yes, they all use 30204

Thanks guys i'll make a note of it and nip down the local suppliers

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.