Te mortuo heres tibi sim?
Join Date: Aug 2004
Location: East coast
Bikes: hardtail, squishy, fixed roadie, fixed crosser
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No idea why your measurements are off, unless you've got something out of spec, or are measuring wrong.
Screw the measurements as suggested. If you're only running a single ring, space/move things however you can to get the chainline running from the front ring straight down the middle of the dingle cogs. That way you're only off a bit when running either one.
I ran a single ring/Dingle cog setup for a long time, and that worked very well. Stayed quiet, didn't wear any faster than other single cog setups I'd used, and never had any issues losing the chain.