RE: Phoenix Extra 330S 60-90 Size
Yup, [link=http://www.rcuniverse.com/forum/fb.asp?m=8875957]here[/link] it is, with OS 1.20FS-E, with only 3 flights on it thus far. Pretty good in the grass with stock wheels, and as you can see the wheel pants are tipped up a bit.
Bigger wheels are always better in grass! On larger planes you can use the Kavan wheels (Hobby-Lobby has them) with the square shoulders. They seem to ride over the grass a bit better, with a wider contact area that lets them step up onto the grass and start rolling. I use these (the 3-1/2" ones) on my 50cc AW Yak and they are noticeably better than the skinny stock wheels.
Also helps to use a bigger tailwheel as well!