JMT-chain set comprising a JMT-chain, a crown and a sprocket. JMT - X2 drive chain - series - JMT X2 chains feature a unique X-Ring technology. - by doubling the sealing surfaces there is a significant better seal against dirt and water and a doubled grease reservoir. - 25% more mileage against a unique JX-ring technology O-ring chain. - Made with one of the leading Japanese chain manufacturers. - Made in Japan.