There are many chain manufacturers in the motorcycle industry but most (including some Japanese manufacturers) only offer a single type of sealing ring, using a "one type fits all approach" which is used on all their drive chains.

This can be inefficient depending on the intended use. .

Different types of seals for different applications maximises efficiency and performance

RK currently has FIVE types of sealed-ring chains. Each has its own features and benefits.

• O ring and RX Rings came first. Each a great product in their own right and broadly similar to the competition's current offerings.
• After several years of development, RK added the XW range of sealed chains to radically improve chain life and performance.
• As racing expanded into several different genres, RK also added the ultra thin U-Ring and UW-Ring sealed chains.
• Each seal type is specifically designed for a particular use to provide the ultimate in rotating efficiency with minimum friction, while providing a longer chain life.
• Do not compromise: Maximise the motorcycle's performance by fitting RK chain. Mark Marquez does and he does pretty well...

Affordable, long lasting performance RX sealed chain. The XSO series offers less torsional friction and increased performance.

XSO chains provide up to 7 times longer wearlife compared to standard chains.

Fitment Summary
Compatible with 250 models (yearly).

• Aprilia: Pegaso 650, Pegaso 650 Factory, Pegaso 650ie, Pegaso 650 Tundra, RS 125 Replica, RS 250 Replica LD
• BMW: F650 650, F650 650 Funduro, F650 650ST
• Honda: FMX650 RD12, NX650 M, NX650 N, NX650 P, NX650 R, NX650 R1, NX650 R2, NX650 R3, NX650 R4, NX650 SC, NX650 T, NX650 V, NX650 W, NX650 X, NX650 Y, SLR650 X, SLR650 Y, XL125 V
• Kawasaki: EN 500C10, EN 500c2, EN 500C3, EN 500C4, EN 500C5, EN 500C6, EN 500C6F, EN 500C7, EN 500C7F, EN 500C8, EN 500C8F, EN 500C9, EN 500C9F, KLE 500A10, KLE 500A11, KLE 500A12, KLE 500A13, KLE 500A14, KLE 500A7, KLE 500A8, KLE 500A9, KLE 500B1, KLE 500B2, KLE 500B3, ZX6RR 600N, ZXR 250A1, ZXR 250B1, ZXR 250B2, ZXR 250C1, ZXR 250C2, ZXR 250D1, ZXR 400R, ZXR 400 R-RR
• KTM: Duke 200
• Suzuki: DR 350 SE-R, DR 350 SE-S, GS 500E, GS 500EY, GS 500EZ, GS 500F
• Yamaha: FZ 400 Fazer, SRX 600 single, SZR 6604SU, TT 660R, TZR 2501KT, TZR 250 2MA 2XW, XJ 600N, XJ 600 SD SR, XJR 400 4HM1, XJR 400 4HM2, XJR 400 4HM3 Brembo Caliper, XJR 400 4HM4, XJR 400 4HM6 Brembo Caliper, XJR 400 4HM7, XJR 400 4HM8 Brembo Caliper, XJR 400 4HM9 Brembo Caliper, XJR 400 4HMA Brembo Caliper, XJR 400R, XT 660R, XT 660 X 1D2 10S, XTZ 660 Tenere