1. The polyurethane tire is a perfect alternative component to all kind of carts like hand trucks. It is filled with small air bubbles inside so there will be less bumps than using a solid tire. And it's flat free compare to pneumatic tires. It is puncture proof so you will probably use it for life time.

2. You could choose steel rim or plastic rim, and color as well.

3. If you need specified bearing, leave a message please.