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Old 07-18-21, 10:11 AM
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ThermionicScott 
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I believe this is the right techdoc for your cassette: https://si.shimano.com/api/publish/s...00-8Q-1206.pdf

The Sheldon tables imply that cassettes have uniform spacing, but as you're finding out, Shimano and others were willing to make things slightly uneven for better shifting. My 7-speed cassettes exhibit the same thing -- slightly wider spacing as you get to the small end of the cassette. Shimano hoped that by riveting a bunch of it together and making the remaining cogs and spacers unique, there would be less chance of spoiling this arrangement.
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