Rotor S1 Stem, 100mm

In a conventional bold design, the head fulfills two different purposes on a stem: (1) it pushes against the face of the stem (creating stress) and (2) it provides a surface to tighten the face against (also causing stress to the face of the stem); because of the added stress created by the head of the bolt, excess material is added to the stem and the face of the stem in order to provide a sturdy and reliable stem.

In Rotor’s DTT bolts, the main threads engage onto the body of the stem and the secondary threads engage the face of the stem. When tightening, the different pitch threads evenly distribute the tightening load between the face and the body of the stem. The different pitch threads also allow for a lower tightening force while also producing a high torque value. This added torque value stiffens up the unit and the elimination of material helps minimize the weight and aids in the aesthetics of the stem design. The results: lighter weight, stronger clamping, better looks, increased reliability and a scant 99g total weight (90mm length).

The S1 stem has passed the most demanding European standard fatigue test (EFBe-Standard 7520), completed by the EFBe Institute in Germany, and the awarded “Top Performance” result for the single model offering, ensures that S1 is suited for both road and MTB riding alike. Road or MTB, the Rotor S1 stem will stand to the test of the most demanding riders.

100mm
34mm stack height
7.5 +/-
106g