I had something in my mind about the aluminum (or steel) teeth elongating, causing the chain to wear. Can't actually recall why now.
10 years ago I had a dirt bike that came with a non o-ring chain. That only lasted a few rides over the muddy winter before it was junk. Woops.
Maybe that was it. On another bike (20 years back), I had a chain / sprocket set that BARELY made it from Phoenix to Durango and back. It stretched so fast that I was adjusting it every day. Likely another non o-ring.
#slow-learner
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Non o-ring chains have short life spans, as there is nothing to keep out dirt and moisture, which quickly eats away at the rollers.
And, chain technology has come a long way since then.
I am suprised and impressed that after a couple thousand miles on the EK chain on the '18 gsxr1k...that I have not needed to adjust it at all.
I set it when I put it on, and have only checked it since, I havn't had to touch it.
It's also a 520, down from the stock 525
It has a much higher tensile strength, and even with less mass, is yet to show any signs of wearing fast, let alone any visible wear at all.
It has a Vortex hardcut aluminun rear sprocket, and Vortex steel front, with stock gearing.
I swapped my '03 gsxr1k from the stock 530 to a 520, same kind of sprockets, D.I.D chain.
Both bikes dropped close to 2.5 lbs of weight, rotating mass...on parts that wear out anyway, so basically a free upgrade.
I would not be concerned about modern chains, even stock chains, in terms of strength or durability, and lasting alot of miles.