On the return trip to Dallas from Pennsylvania on my Norton Commando, the final drive chain broke right throught the side plates at 70mph 40 miles west of Memphis, Tennessee. Wiped out the tail light and chain guard, busted the inner primary case, dropping a large chunk into the primary, which ruined the primary chain and sprockets. Using a rope, my brother towed me into Memphis, where we rented a U-Haul and got it home. Fortunately, I had a parts bike in the shed at home. Never bought another Diamond brand chain.