Mock Up Of Back Wheels....

[Swamp Rat]

I picked these wheel barrow wheels up yesterday for the back of my cart, 16" tall, kinda look too big, i slide the straight bar through and done a mock up somewhat of how the back will look, still might slide it back an inch or 2 more back, i got figure up how far back my cylinder is gonna sit then im gonna weld in place the axle right in the center of where the cylinder will sit, so do you all think these tires for the back are too big? I want em big enough incase it needs wheeled out into the grass and also over objects..

http://i139.photobucket.com/albums/q306/FastBu79/d569cbcb.jpg

[Hotfoot]

You'll appreciate those big tires in the rough stuff, because that cart will be heavy, and top-heavy to boot. I'd step them each out another two or three inches for stability. Be sure to get the front wheels placed in such a way that the cart sits level...and the front casters should be fairly large as well. Make good push/pull handles, which will serve as cable storage, as well.
I've had small wheeled, medium and large wheeled carts. When it comes to rolling over grass, rocks, and obstacles, the bigger the better! My gas cart has 20" bicycle wheels on it, and its great outdoors!:)

[smyrna5]

I am building a cart that looks remarkably similar to that one, except mine will have the HH 140 on top and my Thunderbolt on the bottom. If you don't want to put swivel castors or wheels on the front, I would move the wheels up between the cylinders and the welder. That way it will easier to tilt it back to turn it.

[Swamp Rat]

Oh it will sit level, the tires are 16"s, and bout every swivel caster ive looked at that had a 6" wheel measured overall 8"s so that will equal it out and make it level... Also i have some 1x1 square tubing that this piece of 3/4" axle fits quite snug inside of, i was thinking on welding a piece of the square tubing to both sides, slide the axle through and leave it that way where the axle can rotate if its needs to along with if anything ever happens to it i can just slide it out and replace it?, should i do that instead of welding the axle all together where it wont move?