David Caulfield· Registered
Supermag Xtra come with all magnets already fitted.the new supermags are supposed to be a little slower especially if you add the extra magnets .
but.. if you put thicker oil in the bearings you wont need to add them and you,ll have ample breaking.
you might find it a bit too fast straight from the box
Mag Xtra comes with extra magents & bearings in the box