From our experience.  If the rim itself is defective, you will find the problem within 3 months of use.
2 major reasons for the deformation of the MTB rim:
  • It is the tire pressure is too high when I pump air.
  • heat damage (typically caused by the wheel sitting too close to vehicle exhaust) 

The following are the way to solve this kind of problem.
1. Control air pressure.
2. Keep away from high temperatures, such as near the automobile exhaust pipe.
3. Drill a water hole for air pressure Relief. You can look at the article on our website