Race-Driven Extreme MX Gold Non-O-Ring Chain. You will receive 1 - 520-120L MX Non-O-Ring chain. Please check fitment chart above for year, make and model. Our Extreme MX Non-O-Ring chain has a tensile strength of 8048 lbs. Race-Driven Extreme Chains are produced in the Czech Republic using the highest quality products available with German Engineering and Austrian steel. Rave-Driven Chain has minimal stretch due to KSJ bush production technology and ISO/TS Standards. Some chain may need to be cut to fit. Race-Driven is committed to bringing the highest quality products to all riders at an affordable price. Customer Driven – Quality Driven – Race-Driven.