
(fits all
versions of the Baja 5B & 5T)
Two
months prior to the release of these rear A-arms for the HPI Baja 5B &
5T, we released our version of the front A-arms. In that short amount of
time, the durability of our Baja A-arms displayed their unbeatable nature!
That kind of performance can now be matched out back with our rear A-arms
for the 5B & 5T.
RPM
Baja rear A-arms start with the basic geometry of the stock arms so they
are direct replacement parts – no additional parts will be needed.
However, we’ve made a number of modifications to the arms from
there to improve performance and durability. Key durability features are
as follows:
-
The
shock mount on the lower A-arm has been moved forward by a full ¼”
to eliminate the severe rubbing issue of the wheel at the shock mount
that would cause stock arms to break.
-
By
moving the shock mount forward, we were able to increase the material
around the shock mount to protect the lower shock rod end, preventing
it from being the lowest hanging component of the A-arm assembly.
-
We’ve
incorporated a third inner hinge pin boss at the inside hinge pin of
the lower A-arm and tied in structural ribs that help disperse impact
energy and rotational forces from engine torque over all three hinge
pin bosses.
-
Similar
corner webs to those found on our front A-arms have been designed into
the rear upper and lower A-arms as well to help improve strength and
durability.
In
the performance department, we moved the rear hub carrier forward by
1/8” over stock geometry. While this does little to change the overall
wheelbase of the vehicle, what it does do is alter the angle of the drive
shaft as it exits the differential. This reduces the tendency of the Baja
to squat under acceleration. This happens when the torque of the motor is
opposed by the force of friction created by traction at the rear tires
causing chassis squat, consequently causing a loss of grip. By sliding the
rear hub carrier forward, we use the torque of the motor to effectively
“push” the rear wheels into the ground, using both the weight of the
Baja and the torque of the motor to improve acceleration performance. Up
top, RPM rear upper A-arms have had a shape change for added
lateral stability – the stock “Y” shape tends to allow the upper
pivot ball to move forward and backward while the RPM
“D” shape holds the upper pivot ball in place more solidly, providing
a more consistent feel to the performance of the Baja.
Just
like our front arms, we mold our Baja 5B / 5T rear A-arms in both a
stealthy black and a dyeable white version for those that like to
personalize their vehicles. A little Rit clothing dye, some hot water and
our dyeable A-arms can be dyed to any color you prefer!
Tech
Notes: RPM Rear A-arms for the Baja 5B & 5T
are sold in sets consisting of one upper and one lower A-arm. Two sets
will be needed to complete one vehicle.
| 82251 |
Rear Upper
& Lower A-arms - Dyeable White |
| 82252 |
Rear
Upper & Lower A-arms - Black |
Suggested Retail
$25.95 / set
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(fits all
versions of the Baja 5B & 5T)
RPM
front A-arms for the HPI Baja 5B & 5T are designed around the stock A-arm
geometry, which means they are direct fit replacements – no additional
parts or accessories are needed. The list of improvements from there is
extensive! To start, we’ve eliminated most of the hard rib angles in
favor of smoothly contoured curves that enhance survivability during
extreme impacts. Both the upper and lower A-arms incorporate much larger
and stronger corner webs than the stock A-arms while RPM
lower A-arms have a redesigned center brace structure
that helps the rigidity and strength considerably by spreading impact
energies over a much larger area. RPM A-arms will hold
their shape better and have less flex than the stock arms as well!
After
extensive in-house review of 5B & 5T A-arms in stock form and listening to Baja
owners, we found that the stock pivot ball socket tends to break out under
certain impact conditions. We addressed this problem by adding nearly 15%
more material around the diameter of the pivot ball socket and we
redesigned the shape of the socket to add more support and improve crash
survivability without creating any interference with suspension or
steering movement. While we were redesigning the pivot ball area, we
reduced the amount
of slop in the ball socket to help improve and maintain more consistent
camber and toe angles for smoother, more precise steering.
Another
problem we encountered with the stock A-arms is the lack of protection for
the very low-hanging front shocks. We’ve solved that problem in a couple
of ways. First, we elongated the lower shock mount, leaving no part of the
shock exposed. Next, we incorporated a unique lower A-arm skid plate that
completely covers & protects the lower shock mount. This skid plate
adds serious bulletproof RPM protection to the lower end of
those extremely expensive shocks while adding strength and support to the
whole lower A-arm. Additionally, these skid plates are reversible!
Since the A-arm is angled up, only the lowest part of
the skid plate (the rear area) will see the most wear. By making the skid
plates reversible, the 5B / 5T owner can run the skid plates until they wear
thin on the one end, swap them from one side to the other and they’re
good to go for more punishment!
We have found that a large
percentage of 5B & 5T owners like to personalize and customize their buggies.
That is why we offer these new arms in stealthy black and fully dyeable
white options. With a little Rit clothing dye and some creativity, our
white A-arms
can be dyed to any color imaginable! Please see our website FAQ
page for more information on the dye process.
Tech
Notes:
RPM A-arms are sold in sets consisting of one upper A-arm,
one lower A-arm, one lower a-arm skid plate, two shock spacers and two
skid plate mounting screws. Two kits will be needed to complete one
vehicle. RPM Replacement Shock Skid
Plates work with RPM Baja 5B / 5T front A-arms exclusively and
are sold in pairs with necessary mounting hardware.
| 82141 |
Front Upper
& Lower A-arms - Dyeable White |
| 82142 |
Front
Upper & Lower A-arms - Black |
| 82161 |
Replacement
Shock Skid Plates (2) - Dyeable White
|
| 82162 |
Replacement
Shock Skid Plates (2) - Black
|
Suggested Retail
$27.95 / set
$9.95 / Replacement Shock Skid Plates (2)
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|