Well Spring has sprug in these parts and here I'm building and not at the field going to have to change my R/C activities, I just know the smart members of my club would be at the field- Well, I see nearly two years later(there have been other projects...)we have retracts but this time the 85 degree Spring Air units and again they are well engineered and built-] now I need 2-1/2" wheels any suggestions for this application thanks-