All RK Heavy Duty & Sealed-ring Motocross
utilize special heat treated hi-carbon steel components
with solid rollers and bushings, then pre-stressed
and pre-stretched for maximum performance and
Hear testimonials from Factory and Privateer
Teams on RK Chains and Excel Rims.
and GB428MZX (& NON GOLD 420, 428MXZ)
Heavy duty Rated up to 125cc Applications:
These lightweight Gold mini-works racing
chains were developed from the same advanced
alloy material and manufacturing technology
as GB520MXZ. Both 420 and 428MXZ Racing
Chains are the strongest in their class
giving you the best Value-Performance rating
of any MX Racing Chain in the world today!
Available in Gold or Metal finishes.
428SO RK offers the best O-ring
chains in the industry. All RK O-ring chains
are constructed of hi-carbon alloy steel
for strength and durability. RK utilizes
Nitrile Butadiene O-rings to seal in lubrication
and deliver smooth power with no O-ring
drag or loss of horsepower.
GB520MXU SEALED MOTOCROSS
MXU is the lightest sealed-ring motocross chain available on the market today. Made for the professional motocross racer, GB520MXU is the next generation of motocross racing chains featuring RK's new UW-sealing rings. MXU chains are designed to provide the most consistent power delivery and increased chain life. All components are heat treated using Rk's exclusive HIT (Heat Induction Transfer) process. MXU has a maximum tensile strength rated at 9,000 foot pounds, weighs a mere 3.0 lbs for 100 links and can handle any MX race application from 125 to 500ccs.
( & NON GOLD 520MXZ)
Heavy duty Rated up to 500cc Applications:
Made for the serious Motocross racer, GB520MXZ
is available in our distinctive gold or
metal racing finish. MXZ chains feature
Chromoly steel construction with seamless
rollers and bushings, and oversized special
alloy pins for added strength. All components
are heat-treated using RK's exclusive HIT
(Heat Induction Transfer) process. With
a maximum tensile strength rated at 9000
foot pounds and weighing in at only 2.89
lbs., GB520MXZ4 is the lightest and strongest
Motocross chain available today! Ideal for
professional level 125cc to 500cc Open Class
racing. Now available in Neon Red, Neon Blue, Neon Green and Orange!
and Non-Gold 520EXW XW-Ring
Rated up to 750cc Applications: Dirt and
ATV GB520EXW is RK's premium quality 520
XW-Ring chain. XW-Ring chains are the best
high-speed, extreme heat performance chains
available today. So, If you've modified
your ride into an extreme high-speed machine,
you need the strength and performance of
GB520EXW. With a maximum tensile strength
rated at 8500 foot pounds and suitable up
to 750cc ATV/Quads and Off-Road bikes, GB520EXW
can handle anything you dish out!
Quickly and easily breaks 40 & 50 type
chain. Easily press-fits tight tolerance
40,50 & 60 O-ring chain sideplates to
the correct depth for clip or rivet link
installation. Flares RK's special pin hole
rivet links to the proper dimension to secure
sideplates in place. Works on most brands.
Lifetime warranty on tool body & Handle.
Replacement parts available.