That's what I figured. It's correctable and man there is VERY little space to play with!
When mocked up I came up with 48 3/4" When I did the math measuring the mounted wheels and tires and the frame rails etc I came up with 47 5/8". Being there is only an inch difference I figured i'd go with the small er dimention. Which in itself would leave me 1/2" between the tires and the frame.