So treat the wheel as a circle that will open up into a line, hence a perimeter of the wheel = distance travelled for 1 turn of the wheel. 
58m = 29turns
58m=29x (perimeter of wheel) = 29 x (πx diameter) 
2 = 3.14 x (diameter)
diameter = 0.6369 = 0.64(nearest tenth) 
__brainliest if helped!