You can call us here: 832.405.8209
RK Chains
RK Heavy Duty & Sealed-ring Motocross Chains.

All RK Heavy Duty & Sealed-ring Motocross chains utilize special heat treated hi-carbon steel components with solid rollers and bushings, then pre-stressed and pre-stretched for maximum performance and wearlife.

Pin Length MM Max. Wear Life Index Max. Tens. Lbs/Ft Wt. Lbs. per 100 Links Max. cc Price Range*
GB420MXZ 15.70 300 5,000 1.76 125 $28.00-38.00
GB428MXZ 17.60 300 5,800 2.13 125 $33.00-44.00
420SO 18.15 200 7,900 3.15 250 $54.00-63.00
428SO 17.50 300 9,000 2.99 150 / 125 $28.00-38.00
GB520MXU 15.70 300 5,000 1.76 500 $87.00-120.00
GB520MXZ4 18.00 600 9,000 3.10 500 $125.00
GB520EXW 20.80 1,000 8,500 3.36 750 $108.00-124.00

* Prices are suggested retail and rounded off to the nearest dollar. Please contact us for a quote. Prices subject to change without notice. Prices shown are for 120 links.

GB420MXZ (and 420MXZ non gold)
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. The 420 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.

GB428MXZ (and 428MXZ non gold)
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. The 428 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.

420SO
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.

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.
GB520MXZ4
( & 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!
GB520EXW 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!


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Contact Details
Company: JD CYCLE PARTS
Street: 15903 Ivy Bridge
(by appointment)
City/Zip: Houston, Texas 77095
Email: info@jdcpmx.com
Phone: 832.405.8209
Fax: 281.815.5992
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