I've run the gar-aero, the original old "air streaks" and the new ak bush wheels. By FAR the Bush Wheels are the BEST tire every made for off airport work!
Keep in mind that some folks buy big tires because they like the look, and I agree that they look cool. However in a real world application for landing in soft/rough stuff the Bush Wheels are by far a superior tire to anything ever built, period! Plus, Bill, Whup, and the rest of the crew at Bush Wheels are very nice folks to do business with.
The 29" tires begs the questions why not buy the real thing, 31" tires?
The 31" tires have the side wall to take-up all the bumbs. If the plane is set-up right, and you're confident to land in the rough stuff, the bush wheels are the best insurance you can buy.
What you're really getting when you put on bigger tires are more sidewall. The sidewall height, couple w/ the soft durometer of the rubber thier made from, give you a big shock absober. On pavement, espesially on a hot day, they are a little grabby, be quick on your rudders. I generally touch one tire, then rock it over on the other, and then let the tail down.
With the gar-areo you're getting a heavy old peice of junk that you could use on a farm tractor, not something I'd want on a fine machine like a Cub.
Good Flying...>Byron