EK's 520 MX chain is a proven non-sealed roller chain built for riders who want minimal drag and maximum power transfer over ultimate longevity. It's a popular swap for Surron Ultra Bee and other 520-chain e-moto or MX builds where every bit of efficiency counts. Racers in particular favor a non-sealed chain like this one because it runs lighter and freer than an O-ring chain, even though it demands a bit more frequent lubrication to stay protected between motos. Compatible With: Surron Ultra Bee Other 520-chain e-moto and MX builds (cut to length for your gearing) Features: 520 x 120 link count — cut to length for your setup Non-sealed standard roller chain for minimal drag Gold outer plates, black inner pivot links Quad stake riveting for a secure, race-ready connection Includes clip-style master link for easy installation Favored by racers for lower rotating drag versus O-ring chains Keep the correct link count on hand as a spare — chain failures are rare but they end a ride day fast when they happen. It's a proven choice among racers who value a light, fast-turning drivetrain. Whether you're lining up on the start gate or just putting in trail miles, having the correct chain spec on hand keeps you from being stuck improvising a fix. Ships fast from the USA, straight to your door. See Also: Warp 9 Surron Drive Chain | Warp 9 Ultra Bee Disk Guard | Warp 9 Ultra Bee Jack Shaft Sprocket | Warp 9 Frequently Asked Questions Will this fit my bike's stock link count?It ships at 520 x 120 links — cut it down to match your specific gearing and swingarm length during install. Is this an O-ring or non-sealed chain?It's a non-sealed standard roller chain, chosen for lower drag and maximum power transfer rather than long-interval sealed lubrication. What master link style does it use?It includes a clip-style master link for straightforward installation and future chain maintenance.
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