Rox Speed FX built nerf bars for the
Ace that help protect it from trees and
rocks damaging it or getting caught
between the wheels.
ITP Baja Cross tires are mounted on
ITP Black OPS SD dual-beadlock rims.
The tires won’t spin on the rims and will
let you run on a flat tire until you can
An RVS Performance light bar is mounted on Rox Speed FX’s Ace roll cage to
brighten up the night.
shocks by Motowoz have a dual-rate
spring setup with crossover, rebound
and spring preload adjustments.
That is a first for the aftermarket Ace
front suspension that we know of.
The MacPherson struts don’t have
enough room in the design to allow
for all available shock adjustments, so
Motowoz could only include rebound
or compression adjustments. Since
they designed their suspension with
dual-rate springs, they went the route
of having an adjustable rebound control. The rear Motowoz suspension is
more adjustable with high- and low-speed compression adjustments built
into the coil-over shocks.
clamp the 28 x 10-14 Bajacross ITP
tires to the rims securely on the outside and inside tire beads, so there
is absolutely no tire spin on the rim.
Polaris has been using their
MacPherson-style front strut suspension setup in a lot of their machines
for a while now. A dual-A-arm setup
allows for more customization ability
to install wider arms and long-travel suspension, but the MacPherson
design keeps production costs down
and, in some cases, makes a machine
more stable. Motowoz designed an
adjustable reservoir suspension with
dual-rate springs for the front and
rear of the Ace that use stock parts.
The MacPherson front strut is still
utilized in their design, while the rear
shocks are stock replacements on
the dual-A-arm setup. The new front
In stock form the Ace 570 has
enough power to have a fun time, but
the addition of an RVS Performance
clutch kit helped propel the machine
just as quick with the 3-inch-taller ITP
tires. The kit boosts the bottom and
mid-end power of the 570 engine and
keep the rpm in a more usable range.
The new ITP wheels and tires provide
a lot more grip in all types of terrain
than the stock tires did. They don’t
have as much sidewall flex, they
grip hard in turns, and claw through
rock, mud and dirt. To help slow the
machine down, DP brake pads were
installed on all four corners of the
The Motowoz suspension made
the biggest difference in the handling of the Ace 570. The adjustable
suspension sucks up chop, whoops,
landings, reduces roll and more with
ease. The stock suspension made the
Ace feel bouncy and rough, while
the Motowoz setup is very smooth
and improved the feel of the machine
The Rox Ace was designed as a GNCC racing machine,
so protection is important. Rox Speed FX designed a front
bumper that holds a winch and front bash plate.
Rox Speed FX built a new rear bumper that ties into their roll
cage. It protects a large amount of the rear end of the Polaris