This 4” Diameter Heavy Duty Wheel has a thick plastic center core and an outer band of rubber in order to provide excellent traction on smooth surfaces. The ½” center hole is surrounded by 8 holes on the Actobotics 0.77” pattern but it also possesses the 1.5” pattern used on larger parts.
Tech Tips:
Helpful Wheel Formulas:
X = Wheel Diameter Y = Motor RPM
inches / second = XY(3.14159) / 60 feet / second = XY(3.14159) / 720 miles per hour (MPH) = XY(3.14159) / 1056
Example: X= 4” Wheel Diameter Y = 20 RPM Motor
inches / second = 4 x 20 x 3.14159 / 60 = 4.19 in/sec feet / second = 4 x 20 x 3.14159 / 720 = 0.35 ft/sec miles per hour (MPH) = 4 x 20 x 3.14159 / 1056 = 0.238 MPH