In this weeks post, we will examine the differences between the train wheels and mainspring in a Rolex 3135 and an Omega Co-Axial movement. There are quite a few differences in this part of the comparison. Rolex Train Wheels First the train wheels.    On the Rolex, you will notice that the 4 train wheels are rather large and quite sturdy.  The teeth are of normal size, not too big.. Read More