[David Caulfield]

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

Supermag Xtra come with all magnets already fitted.
Mag Xtra comes with extra magents & bearings in the box