The term “rims” is often misunderstood and sometimes used interchangeably with the word, “wheels.” In truth, rims are the outer portion of the wheel that pushes up against the tire. Rims serve an important function to provide support to the wheel and ensure the tires remain full of air by maintaining a good seal. Advertisement
The rim is also the area of the wheel that endures the most impact force from backcountry hazards like loose rocks and sharp berms….

Check out the original article: [Slashgear] What Type Of Rims Are Best For Off-Roading (And Which Are The Worst?)