KJGCT1

I am finishing my scratch built Extra 300 and its funny, there are no specs for wheel size! It shows the plane on the plan with gear but no wheels.. It gave gear dimensions but no info on wheels! Never saw anything like it! So it is a 55 CC plane with a 88" wingspan, I am thinking 3 1/2 to 4", what are your thoughts? How about a spinner, a fellow club member thought a 4" would be good, seems a bit large to me? This is my first time posting a question, make my day guys!