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Discussion Starter #1
I have a Northrock XC00 Fat bike with 26x4" tires.
It has an oddball 120-121mm front fork dropout.
I measured 55-56mm from the outside rim edges. Take off a 1-2mm per side makes it 52mm or (50mm to make things even).

I want to be able to put on a smaller tire, from the rim to tire graphs it looks like you can go 1.5X the rim edge width to about 2 or 2.5X.

50mm x1.5 = 81mm(3.18") and 50x2=100mm(3.93")
Can I install a 3.00" tire on that 50mm rim and be alright?
 

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The trek stache 5 I had came with Mulefut 50 rims and a 29X3 Tire. Im not sure inner dimension of the rim but you could look it up and find it I'm sure.
 

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Discussion Starter #3
Thanks, all the charts I've seen havent showed wide rims, I am sure they are out there.

I just found this, interesting read.
https://bikerumor.com/2016/08/12/tech-story-match-bicycle-tire-width-rim-width-best-results/


Basically it states:
4.8"-5" is 90mm Inside Width rim
3.8-4" is 75-80mm for snow, and narrower as 50mm with high pressure for summer riding.

"a good starting point is likely using a rim with an inside width of 50-65% of your tire width."
 
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