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it's a 6-bolt sprocket that fits on a disk-hub; there seems to be only Hope and "Gusset" whoever they are that make them
Velosolo make 6-bolt sprockets, lovely ones at that. Phil Wood does too, but I get the impression that you won't like the idea of $75 sprockets :)
gbj_tester
I also ideally don't want to buy a new sprocket. And if I do have to, I'd much rather buy a 16t or 20t as those are cheaper (it's a 6-bolt sprocket that fits on a disk-hub; there seems to be only Hope and "Gusset" whoever they are that make them. The Gusset ones are a lot cheaper but only in even numbers).
According to your calculator above if 50/18 fits with 1% stretch then my chainstays are 41.7 cm plus or minus n chain links. Which means that 53/18 is pretty bang on at 41.66 cm or so. I'm assuming that everything is modular so that if my chainstays are 1 inch longer and I have two extra links the results are the same? This is not technically accurate because the chain isn't going perfectly horizontal, it's at an angle.
Re. chain stretch; what's the proper term? It's not 1% chain wear because really the chain is 100% worn. "A 1% increase in chain length due to wear" is a bit wordy