The new BZ Master pulleys showed up on my doorstep today and I was surprised to see that this wasn’t just the one from the aluminum BZ5 diff in a different color. Atomic has in fact made two major changes:
- The new pulley uses 10 balls instead of 8
- The new pulley is about 1mm wider
In addition to there being two more holes, the balls fit in them much tighter. The fit is very similar to the updated ball diff that comes with the MRV.
Here you can see the width of the new pulley when compared to the one from the BZ5.
I was a bit concerned about alignment issues with the BZ5 pulley but that’s not the case with this new one. The alignment is very close to that of the stock plastic pulley.
