For grass runways I would not recommend ANY wheels less than 2 1/2" diameter (3"+ is better ). That said, as long as your wheel pants are PROPERLY secured you should have no problems.

I fly from a grass field with wheelpants all the time. However I do have them properly secured. How I secure my wheelpants is as follows:

1. I use a wheelpant bracket (SIG and others make some good ones ).

2. Once I have determined the angle of the pants I grind a flat spot on the axle for the set/lock bolt (SIG does not have the set/lock bolt contact the axle. For them I use a SMALL DROP of 5 minute epoxyto secure the bracket to the axle).

3. I use a drop of blue locktite on the set/lock screw.

4. I also use DuBro nylon landing gear brackets (the nylon ones with the "hump" in them ) to secure the leg of the landing gear to the wheelpants.

5. If the wheelpants you are using do not have a ply backing inside the pants, add a 1/8" lite ply backing to the inside. Make sure the backing is wide enough AND high enough to bolt the wheelpant bracket to and fasten the landing gear strap to.