wesnewell said:
Neither of those are well suited for a wide tire. You want a 32mm ID rim minimum imo for any tire over 2.125". I don't know where you will find complete wheels for disc brakes with wider rims. You may have to build them yourself by buying the hubs, spokes and rims. In the end it will be worth it.
If you had told anybody that in the early 1990s (the period when 2.5-2.6" tires showed up), they would have laughed at you. There were no rims more than 32mm
outside width, let alone inside width, and most of those were singlewalled cruiser crap.
2.125" tires were first implemented on "heavyweights"-- balloon tire cruisers that predated mountain bikes by many decades. Very few of those bikes had rims as wide as 32mm inside. And those cruiser rims looked silly wide to mountain bikers after about 1988, until the downhill fad broke through to the mainstream.
We put 2.1", 2.2", 2.3", and 2.5" tires on the 13-20mm inside width rims we had available, and they worked. The tradeoff was we could not run them at the very low pressures they really excel for, or we'd risk rolling them off the rim in hard turns. But one advantage was that compared to being mounted on a wide rim, they had a cushier ride at the same pressure.
Here's a picture of an ultra-premium MTB from 1990, sporting a 2.5" tire. Note the width of the rim on this cost-no-object bike:
My 29er had a 60mm tire on a 19mm (inside) front rim for years, and it worked fine that way. I'm happier with the roughly 32mm (inside) rim it has now, because I can use pressure as low as 18psi without issues.