Super Slim Lite Wheels

I bought these wheels to go on my new Apprentice STS 1.5 to replace the smaller ones that come on it. The reason I'm putting these 3" wheels on it instead of the stock wheels that came on the Apprentice is because of some of the things I've seen on You Tube. It showed the smaller wheels on the Apprentice at times on landings on smooth grass on a bounce or rough grass would result in scuffing the prop. Some of the pilots went to a larger wheel (bigger than a 3") (3.25 - 3.50), but had to use tubing to make it work on the axle and I think this would add more weight to the plane's center of gravity. These wheels fit the axle perfectly because they are 3mm and so is the axle on the Apprentice. Also, they are light weight too.