I purchased the megaexo version from another vendor. As frames change, 24mm spindle bottom brackets are becoming harder to find, especially in high end versions like this carbon fiber crankset. Indeed, the crank itself is a beautiful piece of carbon fiber to behold. In one's hand, one can easily discern the weight difference between this crank and the Shimano Ultegra crank it replaces.
However, one weakness in the design is the way the free crank arm (non-spider) attaches to the spindle. It comes with a self-releasing screw/bolt which is used to tighten as well. The compression (where the arm fits against the bearing) relies upon a spring washer. Depending on the health of this spring washer, binding of the bearing or distortion of the inner bearing race could occur if the screw is too tight or if it is too loose the crank arm could also come loose.
The two screw compression system found on Shimano cranks is a better design. It is much more secure and does not rely on the compression of the lateral forces (along the spindle) between the crank arms to secure them.
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