What tires do you have can I see a picture of the setup with the tires?
Damn that’s crazy
I forgot to post back here – but I figured it out, at least I think. Swapped out my motor pinion on the loud side for a spare I had, and the gnarly noise is gone.
Still hearing some small noises, I think it’s coming from the opposite side. These are new-to-me drives and came with a bunch of stuff, I must have installed a (very) used set of pinion gears I had without realizing. The one I swapped in had way better looking teeth.
I’ve got the SNR anniversary ride this weekend so I’m probably going to just ride this as-is for now, will swap the other pinion next time we have a rainy few days.
That was one of the most frustrating things I’ve dealt with… didn’t want to have to redo the pinions, so I tried literally everything else before I finally whipped out the torch. 
Oh, just swapped to Kendas. Kinda wish I’d gone CST instead based on what I’ve been hearing.
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Tires wear, just carve hard and you’ll need a new set in no time 
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For me I had a soft sound but it was the rubber strands sticking off the tires hitting the gear drive lol.
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