1. Color change: The color of light-colored non-marking tires has changed.
2. Welding joints fall off: the welding seam of the steel ring of the press-fit solid tire is unwelded, and the joint of the steel ring inside the inflatable solid tire is broken.
3. Cracks in the middle: cracks from the clamping seam after use, mostly in small-sized solid tires.
4. Skidding: the tire diameter is too large or the rim diameter is too small, causing the tire and rim to slip.
5. Inconsistent wear: The left and right sides of the running surface wear are inconsistent after use.
6. Blocking: The rubber surface is partially lumped off.
7. Radial cracking: rubber cracks along the diameter direction, mostly in press-fit tires.