BOLD MAGENTA part numbers are new for 2025 BELTS, CHAINS & SPROCKETS PARTS-UNLIMITED.COM ATV/UTV | 2025 717 SIZE AND TYPE WEAR LIFE INDEX AVERAGE TENSILE STRENGTH (LBS.) MAXIMUM ENGINE CC STREET/DIRT 520 Std. 100 6,800 250/250 530 Std. 100 6,800 400/NA GB 420 MXZ 200 5,000 150/150 GB 428 MXZ1 200 6,070 125/125 SIZE AND TYPE WEAR LIFE INDEX AVERAGE TENSILE STRENGTH (LBS.) MAXIMUM ENGINE CC STREET/DIRT GB 520 MXZ5 300 8,500 NA/500 GB 520 MXU 600 8,000 NA/500 520 EXW, GB 520 EXW 1,000 7,700 NA/750 FEATURES All RK chains are pre-stressed and pre-stretched to ensure equal load distribution and minimal maintenance.They’re made of the highest-grade medium carbon alloy steel available, with all components shot peened and heat treated. HOW TO ORDER RK chain is available cut-to-length or in bulk. Precut lengths are individually boxed with a clip-type connecting link, and all bulk rolls include clip-type connecting links.When ordering precut lengths, the number of links is indicated at the end of the PART # (example: PART #RKM52082 for a 520 Standard chain with 82 links). 520 EXW CONNECTING LINK DESCRIPTION PART # Clip connecting link R18-520EXW 520EXW – CUT-TO-LENGTH NO. OF LINKS PART # 100 RK520EXW-100 110 RK520EXW-110 NO. OF LINKS PART # 120 RK520EXW-120 GB 520 EXW (GOLD COLOR) – CUT-TO-LENGTH NO. OF LINKS PART # 100 GB520EXW-100 110 GB520EXW-110 NO. OF LINKS PART # 120 GB520EXW-120 GB420MXZ (GOLD COLOR) - CUT-TO-LENGTH NO. OF LINKS PART # 82 RK420MXZ82 100 RK420MXZ100 104 RK420MXZ104 110 RK420MXZ110 NO. OF LINKS PART # 114 RK420MXZ114 118 RK420MXZ118 120 RK420MXZ120 124 RK420MXZ124 NO. OF LINKS PART # 126 RK420MXZ126 130 RK420MXZ130 132 RK420MXZ132 GB420MXZ CONNECTING LINK DESCRIPTION PART # Gold clip connecting link R18422MXZ GB520 EXW CONNECTING LINK DESCRIPTION PART # Gold clip connecting link R18-GB520EXW DESCRIPTION PART # Gold rivet connecting link R18-GB521EXW M520 – CUT-TO-LENGTH OR BULK NO. OF LINKS PART # 82 RKM52082 84 RKM52084 86 RKM52086 NO. OF LINKS PART # 90 RKM52090 92 RKM52092 98 RKM52098 NO. OF LINKS PART # 130 RKM520130 25’ roll (cut-to-length) R18-M521 M530 – CUT-TO-LENGTH NO. OF LINKS PART # 118 RKM530118 STANDARD (M) •Heat-treated medium carbon alloy steel construction •All components heat-treated and shot-peened for maximum strength •Four-point pin riveting and solid rollers •Chains include clip connecting link HEAVY DUTY (MXZ/4) •These lightweight chains are developed from advanced alloy materials and manufacturing technology • Feature chromoly steel construction with seamless rollers and bushings, and all components are heat-treated using RK’s exclusive HIT (Heat Induction Transfer) process • Moderately priced, 420 MXZ chains are the strongest in their class, giving you the best value-performance rating of any MX chain in the world today •Up to 150cc applications •Chains include clip connecting link XW-RING (EXW) • High-speed, extreme heat performance chains that can handle large cc motors •Suitable for up to 750cc off-road motorcycles •Chains include clip connecting link GB520MXU (GOLD COLOR) NO. OF LINKS PART # 110 links 1222-0190 114 links 1222-0192 NO. OF LINKS PART # 116 links 1222-0193 120 links 1222-0194 NO. OF LINKS PART # Clip connecting link 1225-0144 SEALED UW-RING (MXU) •The lightest sealed-ring MX chain on the market •Designed for the professional motocross racer •Designed to deliver consistent power delivery with an extended chain life •Ideal for race applications between 125 to 500cc •Chain includes clip connecting link
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