Originally Posted by
Craptacular8
There are tons of fat bikes out there with 80-90mm rims and 4" tires. Surly's rims for their 3.8" Nates stock were on 82mm rims. I see on 45NRTH's website for the Dillinger 4's, they specify that they are for rims of 64-94. If you want new rims in the 65-70 size to shed weight, that's a whole other ball game.
Well my thought was that a 90mm rim with a 4” tire will cause it to be more “square” and affect the riding characteristics from what I read. I’m not 100% on how it would play out but what I thought was that a more rounded profile would help with cornering and also leave the sidewalks/rims less exposed.