Nimbus Hatchet - Which rim/tire size would you build?

I finally got my hatchet put together, I picked a Surly My Other Brother Darryl rim that’s been on clearance for a long time. I wanted to go tubeless, and at the last minute decided to use a studded tire meant for my bike. The Wrathchild 4.6 doesn’t exactly go on this rim easily and you can see I do not have the tire labels lined up with the valve stem and weld (I didn’t forget just couldn’t persist through the struggle). I didn’t measure this tire, but I’m pretty sure 4.6 isn’t accurate because it looks smaller than my Bud & Lou that are marketed as 4.8. This is my first ride on a fat unicycle so I can’t compare the tire to anything else, but it feels amazing on snow and ice. It’s a bit of an adjustment because this is a new form factor for me, and I’m a bit out of shape as I haven’t been unicycling much since Thanksgiving. I’m also somewhat new to unicycling, although I did put in some miles in 2020… I don’t measure pressure but the tires on there tight and I am not worried about it burping so it’s not set up bouncy. Not sure what auto-steer feels like on a unicycle but I don’t think there is any on this it’s more resistance to turning, especially on pavement, expected for a fat tire. This is kind of an extreme tire but its a hatchet right? I have other frames to put slicks on. For now I’m going downhill, maybe the 137 cranks are too short? Right now it’s -17F but maybe later today I’ll try again.

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