A lot of people assume that a z71 suspension is tuned stiffer for off road but in reality when off road a little softer suspension tune is advantageous to prevent bouncing around on uneven surfaces giving you a more positive traction. The z71 suspension is tuned for this so on bumpy roads it is likely to have a better ride. On the twins the z71 parts are all in the front end. Rear suspensions are identical on z71 and non z71 configurations.