got one of these apart the other day, thought it might be of use to others.


Brant previously suggested that the only way to get 'em apart would be with a blind bearing puller. my mate Blggs and i used a bit of ally tubing just shy of 20mm diameter, and 2-3mm thick. we hammered a tapered gas fitting into the top of the tube, when the tube end was lined up with the inner ring ( second piece in from the end ). this gave enough purchase to drive out both the inner and outer rings – the outer ring is a push fit.
did the same on the other side, but had to use another bit of tube, obviously.
then heated the hub up with a hot air gun. hairdryer or hot water would probably do. i did get it bastid hot – i could feel it radiating back at me when i put the 9mm adaptor into the bearing and wiggled it about. by angling this over a bit i got a bit of purchase on the bearing and it came out pretty easy.
bearings are '6904 rs1'. 37mm OD, 20mm ID, 9mm W. i ordered 6904 2RS from the good folk at smb bearings ( very nice to talk to, and ordered early afternoon, received following morning ), for 5.50 each ( or thereabouts. )
when re-assembling i did the disc side first, then i could put the disc mounting face down onto the vice jaws to tw4t the other side bits in.
it's actually not a bad design. very well sealed.