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permanently joined together
It's not too taxing to drill the head off the rivet... Depends how much you want it!
Making a 9-speed 13-34 would be easy
Except you would need a 13T designed for a lockring (along with a lockring large enough).Apparently not.
hamrack-
It's not too taxing to drill the head off the rivet...
That's the easy bit. You then have to rivet the 30 back on and rebate the spider to bring the stack down to the desired width.
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you would need a 13T designed for a lockring (along with a lockring large enough
The lock ring is already large enough, and while serration is nice, it's not absolutely necessary.
gbj_tester
Shimano knows. Look up the EV for any cassette you're interested in by googling, e.g. "CS-HG500 EV PDF"
This shows the eight largest sprockets on the 11-34 are more or less permanently joined together. Making a 9-speed 13-34 would be easy, making an 11-30 would be particularly taxing in this instance because 30 and 34 are riveted to the same spider.