I have always rode with 1.6 inch fins, but I took them off a couple of weeks ago to ride the cable park. Even though I regularly ride at a lake, I still haven't put them back on, partly because we have a slider, kicker, and ramp at our lake, and partly because I can do more tricks without them. I think you have to have fins to cut harder to do bigger tricks, but for me that ain't too much of a problem. I would advise molded fins or no fins, personally.