Ok, I checked my measurements, and I have a 3.33" pulley (edge to edge since the ribs come up to same level), and 130mm crank pulley.
I think my hydraulic belt tensioner is tight enough, but my belt should be 5-10mm shorter to that there's less slack. Am I correct in assuming that a 2315 belt is exactly 5mm longer than a 2310 belt?
Either way, I'm ordering a 141mm Jaws crank pulley soon
, so I'll need a different belt