oddeffect

I would suggest that the Zoot Pro or Inspired Fourplay would be better than the Echo. But if you still want the Echo, it should be the Echo Mark 5.

For the Inspired Pro hub (old model with 10mm bolts), the bearing markings typically indicate the size and type of bearings used. Generally, you would find markings like "6902" or "61902," which refer to the dimensions of the bearings boxing random