EBMX Rear Shock for E-Ride ProSo, you've tried every mountain bike shock under the sun and they just aren't cutting it, why is that? Our EBMX YSS collaboration shock has been tuned specifically for the eRide Pro kinematics by the best in the business. The fact is, it's all in the oil.. the physical size of a shock and how much oil it holds matters! As soon as things get hot, oil changes viscosity and cavitation occurs, this has a dramatic effect on both compression and rebound.