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Measuring Rear Shock Sag

In general, sag on a rear shock should be set to 15 - 25% of shock travel, depending on riding conditions and/or personal preferences.

To Measure Sag On A Rear Shock

Measurement #1
  1. Before sitting on the bicycle, measure and record the distance from the center of one shock mounting bolt to the center of the other shock mounting bolt. This is known as the "eye-to-eye" measurement.
    Air shocks have an o-ring on the shock body. The o-ring should be pushed up against the scraper lip of the air sleeve without the rider on the bike. If there is no o-ring, use the "eye-to-eye" method.
Measurement #2
  1. Sit on the bicycle in a normal riding position. Weight should be evenly distributed on the saddle, handlebars and pedals. Being properly outfitted in your typical riding gear is also highly recommended, as even a slight deviation in total weight can make a difference. It may be necessary to hold yourself up against a wall or post to steady yourself. Do not bounce on the pedals or saddle.
  2. Have an assistant measure and record the eye-to-eye distance. For an air shock, dismount the bicycle and measure from the scraper lip to the o-ring.
  3. Subtract Measurement #2 from Measurement #1. The difference is the measurement called Sag.

Measurement #1Measurement #2 = Sag
(e.g.,
7.8757.275 = 0.600)

  1. Consult the air or coil springs settings table in the shock's respective section in the owner's manual. If the sag specification is not in compliance, follow the instructions in Setting Sag in the shock's respective section in the owner's manual.


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