Using on a surf cart. They do have bearings which makes them better rolling than without. We'll see overtime if saltwater affects them much. They are wide enough, well constructed, priced well also.
No more sweating under the sun dragging my Kayak on the dry soft hot sand. plows over the sand with minimum effort using these wheels. Fits perfect on the wilderness kayak cart. I believe it's the same exact wheel.
Literally took less than 10 minutes to complete the wheel conversion on my existing cart. Have previously used these same type of wheels on another cart and it makes the use on sand SO much easier. We were going to get rid of the existing cart but decided to try this conversion kit.
I had a beach cart with narrow plastic wheels that was a pain in the soft sand. I swapped them out for these. HUGE difference immediately. This pulls much easier without digging into the sand.
Nir 
Robert Y 
