FRONT WHEEL BEARING SET (ALSO FITS ALL BOLT UP REAR WHEELS)

FRONT WHEEL BEARING SET.

A SEALED SINGLE ROW BEARING AND A NON SEALED DOUBLE ROW BEARING.  THE SINGLE ROW BEARING IS A SKF BEARING 6203 2RS NOMINALLY 40MM - 12MM - 17MM BORE.  NORTON PART NUMBERS 17719, A2/435, 040100, 065542 AMONG OTHERS APPLY TO THIS BEARING.  IT WILL BE FOUND ON ALL NORTONS, SOME VERY EARLY BIKES FROM THE TWENTIES AND SOME COMPETITION HUBS MAY DIFFER BUT TYPICALLY THIS BEARING WOULD BE FOUND IN ALL FRONT HUBS ON THE NON BRAKE SIDE AND ALL REAR HUBS ON THE SPROCKET SIDE EXCEPT FOR THE CUSH DRIVE HUB INTRODUCED IN 1972, THIS WOULD HAVE TWO OF THESE BEARINGS IN THE HUB AND THE DOUBLE ROW BEARING IN THE SPROCKET.  (NON CUSH DRIVE SPROCKETS DO NOT HAVE A BEARING).  THE MK3 DISC REAR HUB WOULD HAVE ONE OF THESE BEARINGS IN THE HUB PLUS A LARGER 065541 BEARING AND 067688 IN SPROCKET.  THE OTHER BEARING INCLUDED IN THIS KIT IS AN SKF DOUBLE ROW BEARING NUMBER 4203 - THIS IS NOT A SEALED BEARING.