WHAT IS IT? The Ride JBI Pro Perch, designed by J.B.
Covington, is a high-performance replacement spring seat
for KYB, Showa and WP twin-chamber forks. It utilizes
shims to create a variable port area to provide plushness
in the initial part of the stroke and better bottoming
resistance than a stock spring seat.
WHAT’S IT COST? $350.00.
www.ridejbi.com or (480) 269-5585.
WHAT STANDS OUT? Here’s a list of things that
stand out with the Ride JBI Pro Perch.
(1) J.B. Covington. The MXA wrecking crew loves
testing products of ingenuity, particularly from creative
individuals who want to make a difference. Ride JBI’s
J.B. Covington is one such person. The 27-year-old
realized his calling when he began working on his own
bike. Covington dissected every facet of his suspension
and discovered that he could improve the parts. The Ride
JBI Pro Perch is the fruit of his labor.
( 2) Spring perch. The objective of a fork spring
seat is to flow oil at a specific rate through the fork leg.
The rate at which the oil flows depends on the spring
seat’s orifice sizes. Kayaba, Showa and WP twin-chamber
spring seats have different openings per each manufacturer’s wishes. For example, KTM’s WP spring seat (gray,
shown in photo above) has large ports in order to flow a
considerable amount of oil. Although great for bottoming
resistance, it fails to offer plushness in the initial part
of the stroke. A conventional fixed port shape performs
optimally at only one certain fork pressure. A spring seat
with small port openings is most effective when riding
at low speed over small chatter bumps. Once the rate of
speed quickens, more oil needs to be flowed through the
spring perch, but small port openings restrict oil and
prevent the fork from bottoming.
( 3) Design. Ride JBI developed a pressure-sensitive
spring seat. Covington accomplished a variable port
area by using shims that open and close based on oil
pressure caused by fork compression. At low speed, the
four shims open slowly to provide a plush feel at the
top of the fork stroke. During heavy impact, the oil forces
the shims to open excessively, which equates to better
bottoming resistance. The perch valving isn’t intended
to be adjusted, although Ride JBI can customize the
spring perch shims to your liking.
( 4) Installation. It will take a competent mechanic to
install the JBI Pro Perch. Are you up to the task? If you
can change your fork seals, then don’t be fearful of
installing the JBI Pro Perch. Their website provides
detailed installation instructions along with photographs.
Worst-case scenario, you’ll need to pay a licensed
mechanic at your local motorcycle dealer to get the job
( 5) Performance. J.B. Covington suggested that we
test the Ride JBI Pro Perch on a 2014 Honda CRF250.
In stock trim, the CRF250 Showa forks are too soft for
heavier and faster riders. The stock forks blow through
their stroke with ease. During testing, we had to raise
the oil height and crank in the clickers to alleviate the
problem. Those maladies were mostly alleviated once the
Pro Perch was installed. We were very pleased with the
performance. The forks were plush over small bumps,
held up better through the stroke, and managed to maintain excellent bottoming resistance during big impacts.
More impressive is that we didn’t need to run extra fork
oil, stiffer springs or max out the compression clickers.
Instead, we could run settings similar to what Honda
intended, yet the forks worked significantly better than
they did off the showroom floor. We would love to try the
Ride JBI Pro Perch on KTM WP forks, which are known
for having mid-stroke harshness.
WHAT’S THE SQUAWK? Installing the Ride JBI Pro
Perch is unnerving for an inexperienced mechanic. If that
means you, then have a professional install the Pro Perch.
The Ride JBI Pro Perch is an engineering mar-
RIDE JBI PRO PERCH
vel that actually works. It manages to provide
plushness through slow-speed sections and
bottoming resistance—a true double threat.
MXA TEAM TESTED