4:1 or 4" inside, 1" outside will overall make your bike thinner (great for keeping your bike under 50" for say LT setups)
3:2 or 3" inside, 2" outside is a little bit wider than the 4:1 (and I BELIEVE - not 100% sure), about what the stock LTR rims are.
It's where the rim is folded to fit your hubs, with 4:1 you have everything tucked further into the rim
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