1- Purchase or find black electrical tape (of approx. 1 inch width) and a hobby knife. Clean and clear the front wheel of any dirt/grime/hair as shown here:
2- Cut the electrical tape in half for a length of aprox. 4 3/4 in. (this will provide about 1/4 in. overlap) :
3- Apply the cut electrical tape on the front wheel while pulling it (this will make the elect. tape 'hug' the wheel surface evenly and tightly), you can use two hands (I used one because I was holding the camera) :
4- When you finish, press with your fingers all along the applied elect. tape in order to take out any ripples/air bubbles and to make sure that it is applied well. Depending on your hard surface floor this will protect your front wheel from premature wear for at least 1 - 3 months! Repeat the process every time you need to prevent wear and tear on the fixed front wheel of your Roomba.