Hello,
I bought a ZS44/28.6 ZS44/30 Headset for my bike. The parts were just loosely in a bag and unlabeled.
Now I dont know which one is the top and which one is the bottom cup. With a caliper I measured a inner diameter of 30mm on both.
Can anyone help me?
by Recorsi_
1 Comment
*General* rule of thumb, the lower bearing will either be A) larger, B) have a lower angle at the race contact area, or C) both. It looks like the zs44/30 is in the top of your pic (judging entirely by the contact angle and a rough estimate of inner race size off of bearing seal width), so that’s likely the guy to live at the bottom of your head tube.
That said, double check those measurements. If the other is actually measuring 30mm inner and not 28.6, it may have been a mispick when packing