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Mini bike #520 chain is a non-standard series roller chain that is in stock at OMB Warehouse. This highly lubricated and durable chain is good for race and dirt tracks. What sets this mini bike #520 chain apart from the others is that it is manufactured with solid rollers, and uses heat-treated components for better performance and higher strength. This #520 roller chain also is supplied with a high-quality lubricant for additional working life. We stock this chain in boxes and cut to length strands upon request. Besides the #520 chain, we also have a full line of sprockets, bearings, motors, reducers, sensors, and more. All #520 chains at OMB Warehouse have a high wear resistance and significantly higher fatigue strength than the standard requirement and are pre-tensioned and treated with special additive chain oil. This has the added advantage of improved running characteristics and also provides better corrosion protection. Chains elongate due to wear. Knowing when to replace a chain is a judgment call for the average rider. It’s best to monitor the sprocket teeth and grooves and replace chain and sprocket components simultaneously. Fresh drive train components have significantly different dimensions from worn-out ones. When they don’t mate properly, they wear their companion parts very quickly.