Thanks for the reply and answers. One more, probably silly, question: does this mean that there is no lube required for cartridge bearings? I assume it is already in the sealed unit and no more can be added so there is no maintenance until the bearings need replacing? What are the signs of worn bearings on a cartridge headset? Do they develop the same indexing problem with wear as cup and cone ones?
As to spares. The two I am considering are the cane creek s2 and the M
art pro
http://www.sjscycles.co.uk/product-C...lack-18390.htm
http://www.sjscycles.co.uk/product-M...lack-17447.htm
The M
art is cheaper and sounds ok but none of the places I have seen it for sale list replacement bearings despite replaceable bearings being listed as a feature. Could I use cane creek bearings in the M
art for example?