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YOUR CURRENT MOUNTAIN BIKE RIM IS TOO NARROW.
If you look at nearly all other vehicles, the ratio of outer tire width to inner rim width is anywhere from 1.2:1 to 1.5:1.
Here are a few examples:
Road bike 1.2: 1
Mountain bike 3:1
So you can see that current mountain bike rims are the complete outlier, everyone else is going about this very differently.
Wide rims were present on the earliest mountain bikes. They rode well, really well in fact. Their downside was that they were heavy, and not strong enough. With recent advancements in carbon fiber and tubeless technologies, we’re now able to bring back the advantages of wide rims with none of the downsides.