I originally had a cart with the skinny tires. It worked okay until they did a beach renourishment project out at Boca. The tires just dug right into the sand, especially if I had the boat loaded with gear. So, I looked into just buying the tires & adapting the cart frame that I already had. Well it didn't take long to discover that the major part of the cost was the tires! For less than $20.00 more, I went ahead & got the frame that was made for the tires. Being of the female persuasion & therfore, not being very handy with construction projects, it was worth it for me.