the Ride: Rides like air suspension, installs like
leaf suspension plus a Ride-Rite™ kit. Air springs
and foundation suspension are re-engineered to improve ride
across all conditions, especially unloaded. The shocks included
in the kit automatically adjust to the load to further optimize
the Load: Big-rig suspension components, big-rig
durability. The vehicle will maintain the same height under
Driver Fatigue: Air spring suspension reduces cab
noise and road vibrations. The harsh and choppy ride of
the factory leaf suspension is largely eliminated.
The tuned dampers and air springs, as well as the constant
vehicle height, greatly improve the handling characteristics.
Drivers will also get less wheel hop during braking and
less shudder during acceleration.
The suspension shaves over 140 pounds off of some 1-ton
trucks. This helps at the gas pump.
Installs in the same space, using the same holes as the
OEM leaf suspension.
trucks use air suspension for a reason. Airide™ suspensions
ride better than steel spring suspensions, and reduce the
wear and tear on your equipment. They protect both the driver
and cargo, regardless of the load.
R4Tech is a patented, hybrid air-over-leaf suspension that
provides the ride quality of a full-air suspension with the
ease of installation of a standard leaf spring and Ride-Rite™
The foundation of the R4Tech suspension is designed and manufactured
by SANLUIS Rassini, the preeminent supplier of springs to
the North American light truck industry. When combined with
Firestone Airide™ air springs and Ride-Rite™ air
accessories, the result is a suspension kit that is unmatched
in terms of durability, reliability, and ride quality.
is a patented, hybrid, air-over-leaf suspension system. By
adding an air spring in conjunction with lower-rated leaf
springs, unloaded ride is greatly improved. The air springs’
adjustability keeps the vehicle capable of the same load capacity
at GVW. You get the advantages of being Airide™ equipped
without the difficulty or expense of a full air suspension
suspension is designed and manufactured by SANLUIS Rassini,
the largest automotive steel spring manufacturer in the world.
Rassini relies on Firestone’s expertise with air springs
and accessories to complete the package.
does R4Tech do?
allows most of the advantages of a full air suspension to
be realized without requiring significant modifications to
the vehicle. The suspension fits into the existing leaf spring
hangers, and is all bolt-on. With the R4Tech suspension installed,
the operator can expect greatly improved ride, improved handling,
and the ability to kneel the suspension for easier trailer
hookup or loading. It is also about 140 pounds lighter than
the original leaf stack on a 1-ton truck, so it will save
some money at the gas pump.
does it work?
de-rating a leaf stack does not work because fewer leaf springs
do not control the axle very well. R4Tech adds the trailing
control link under the main leaf stack to control windup,
similar to a 4-bar. Additionally, the "J" spring
prevents hop and windup under braking. Fewer leaf springs
mean less inter-leaf friction, smoother axle motion, and a
softer ride. The vehicle load is mainly handled by the air
is included in the kit?
includes everything you need to complete the installation
and make it equipped with Firestone Airide™ springs
as part of the R4Tech suspension. This includes the lower-rated
leaf springs, the trailing control link, spring and link mounting
brackets, leaf spring perches, air spring and air spring mounting
bracket, tuned shock absorbers, air compressor and pressure
switch, 3 gallon air tank, mechanical leveling valves with
kneel feature, and a pneumatic switch to activate the kneel