Rear Shock Setup:

Because it is highly likely the original rear shocks on older models are repaired/replaced/upgraded throughout the lifetime of the frame, we offer some very basic tuning guidelines, and recommend using the original rear shock manufacturers manual for more detailed set-up for the specific rear shock you have. Contact the rear shock manufacturer for info if you do not have it.
 The key component for set-up with any rear shock here is sag. Once you have that set-up correctly, the rest of the shock settings are fine tuning adjustments (Rebound and Compression damping, etc.) set to rider preference.

Recommended sag is 20-23mm at the shock shaft - This equates to approximately 25-30% of the total rear wheel travel. Less sag = a firmer suspension feel.

For Coil rear shocks here is a rough spring size to weight guideline for average coil shocks.
This can vary based on rear shock model and manufacturer:
100-130lbs - 400#
140-160lbs - 450#
160-170lbs - 450#
180-200lbs - 500#
210-230lbs - 550#