FILES T E C H
When replacing a suspension component, it’s important to know
how to measure the size. For shocks, sizing is determined by two
key measurements. The first is the eye-to-eye length, which is
the distance from the center of the front-shock mount bolt to the
center of the rear-shock mount bolt. This shock measures 7.875
inches (200 millimeters) “from eye to eye.”
The second measurement is the stroke, which is essentially how
much the shock compresses. This is not as simple as measuring
the length of the body (the slider part of the shock), since some
shocks may not compress all the way into the air sleeve. Typically,
it’s easiest to let the air out of the shock and compress fully to
bottom out, and then measure the distance from the dust wiper to
the O-ring. Once you have the eye-to-eye measurement, you have
the size of the shock. This Yeti SB5c shock is 7.875 by 2 inches
(200 by 51 millimeters).
The final measurement
for sizing your shock
is the reducer hardware measurements.
This measurement is
distance of these pieces. This shock’s front
hardware measures 22
millimeters from outside to outside.
Use the digital caliper to check key measurements. This is particularly valuable when looking at buying a new bike or after a crash
to check for damage. The dropouts should measure either 135,
142 or 150 millimeters wide, inside to inside. A little variance is
okay here, but the measurement should be within 2–3 millimeters.