- by Christopher Jones
- Published: 27 May 2009
A win for Sastre and also a success for ROTOR and the new 3D crank, which has now racked up an impressive 2 stage wins just 1 week after its launch!
These results, along with the confirmation we are getting from the team members about the excellent weight to stifness ratio and perfect performance of the 3D cranks, makes us confident we’ve got a real winner on our hands (not just Carlos… the cranks too!).
The Giro is the fourth and last testing phase for the cranks before starting production. Of course, all tests are going perfectly.
3D crank uses a new variant of DTT Evo technology in the left crank.
3D crank has evolved the Agilis Evo design in fixing the axle to the right crank. The left crank is now used to assemble or disassemble the crankset with a low torque axle end bolt and the new DTT Evo clamping bolt. The opposite paired bolt system (the most common in the market) is no longer needed. Please see the enclosed a picture which explains the update design.
Instead of the opposite paired bolts, an oversized DTT Evo bolt distributes the load forces along the thread. 3D cranks installation is completely conventional but with improvements in both the efficiency and stiffness of the axle-crank interface. See the attached picture.
In order to avoid overtightening, ROTOR 3D cranks include a replaceable threaded bushing between the crank and the bolt.
In case of bolt failure due to overtightening, the crank is not affected and is easily repaired.
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