Both Fixie bike and a road bike has many relevant features in common like smooth & skinny wheels with less road resistance, more aerodynamic structure and lightweight frame. The maximum and average speed of a fixie bike depends upon its design and gear ratio (furnished by the measurement of chainring and the sprocket). Both a road bike and a fixie bike has similar gear ratios with same sized tires and cranks, which means a fixie bike can travel as fast as a road bike.