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I got 20,000 miles out of my stock Regina chain. I then went to an x-ring chain, can't remember the brand, but it broke 10,000 miles later at 90mph on I-95 in So. Florida. It damaged the sprocket cover. That was one time that I wished that I had one of the new Sprints with the simple plastic sprocket covers. As you know, the vintage Sprint sprocket cover carries the clutch slave cyl. and the oil dipstick and costs $100 to replace. I then went with OEM sprockets and OEM Regina chain. At about the same time I fit new tires, brakes, K&N air cleaner, synced the carbs, so, of course my riding went from very aggressive to very, very aggressive and I wore out that chain in a short 10,000 miles. I'm now on a some o-ring chain I bought at the local shop. I've slowed down a little so I'm looking for some better mileage out of this one. I'll keep you posted.
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