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 324 models (yearly).

• Beta: Evo 250 Trial, Evo 290 Trial, Evo 300 Trial Factory, Rev 3 250 Trials, Rev 3 270 Trials, Techno 250 Trial
• Derbi: Mulhacen 659
• Ducati: Monster 620 ie DD, Monster 620 ie MD, Monster 620 S ie, Paso 906 Sport
• GasGas: Trial 125, TXT 125Pro, TXT 200 Trials, TXT 250 Contact, TXT 250LE, TXT 250 ltd Edition, TXT 250Pro, TXT 250 Pro Racing, TXT 250 Racing, TXT 250 Replica Raga, TXT 250 Trials, TXT 280 Contact, TXT 280LE, TXT 280 ltd Edition, TXT 280Pro, TXT 280 Pro Racing, TXT 280 Racing, TXT 280 Replica Raga, TXT 280 Trials, TXT 300Pro, TXT 300 Pro Racing, TXT 300 Racing Formula Caliper, TXT 300 Replica Raga, TXT 300 Trials
• Honda: CBF250 Single, XL600 L, XL600 LM-F, XL600 LM-G
• Kawasaki: BX 250 Ninja R 250, BX 250 Ninja R 250 KRT Edition, BX 250 Ninja R KRT Edition, ER 500A1, ER 500A2, ER 500A3, ER 500A4, ER 500C1, ER 500C3, ER 500C4, ER 500C5, ER 500C6, ER 500C7, EX 250J, EX 250K8F, EX 250K9F, EX 250KAF, EX 250KBF, EX 250KCF, EX 250KDF, EX 250KEF, EX 300 Ninja, EX 300 Ninja Anniversary, EX 300 Ninja KRT Edition, EX 300 Ninja KRT Winter Test Edition, GPX 250R, KLR 650A10, KLR 650A11, KLR 650A12, KLR 650A13, KLR 650A14, KLR 650A15, KLR 650A16, KLR 650A17, KLR 650A3, KLR 650A4, KLR 650A5, KLR 650A6, KLR 650A7, KLR 650B2, KLR 650B3, KLR 650B4, KLR 650C1, KLR 650C2, KLR 650C3, KLR 650C4, KLR 650C5, KLR 650C6, KLR 650C7, KLR 650C8, KLR 650C9, KLX 250 S T9F, KLX 250 S TAF, KLX 250 S TBF, KLX 250 S TCF, KLX 250 S TDF, KLX 250 S TEF, KLX 250 S TFF, KLX 250 S TGF, KLX 250 S THF, KLX 250 S TJF, KLX 250 S TKF, KR1 250B1, KR1 250B2, Z 300 ER300, Z 400F, ZR 550B1, ZR 550B10, ZR 550B11, ZR 550B12, ZR 550B2, ZR 550B3, ZR 550B4, ZR 550B5, ZR 550B6, ZR 550B7, ZR 550B8, ZR 550B9, ZX4 400G
• KTM: Duke II 640
• Montesa: Cota 311 260, Cota 314 260R, Cota 315 250, Cota 4RT 260
• Scorpa: SY 250 Trials, Trials 250
• Sherco: ST 200 Trials, Trial 125125, Trial 200, Trial 250250, Trial 290290
• Yamaha: RD 350F, RD 350F2, RD 350LC2, RD 350N, RD 350R, RZ 250R, RZ 250SE, RZ 350F1, RZ 350 F2 N2, RZ 350R, SRX 600 single, XT 600Z