Rotor S1 stem | Cyclingnews

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Rotor expands into the lightweight component market with its new S1 stem. — Rotor expands into the lightweight component market with its new S1 stem. (Image credit: James Huang)

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Rotor's DTT bolts make it all possible. — Rotor's DTT bolts make it all possible. (Image credit: James Huang)

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The two-bolt faceplate is particularly sleek — The two-bolt faceplate is particularly sleek (Image credit: James Huang)

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The S1's beefy extension makes for a stiff feel. — The S1's beefy extension makes for a stiff feel. (Image credit: James Huang)

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DTT bolts are also used for the steerer clamp. — DTT bolts are also used for the steerer clamp. (Image credit: James Huang)

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Red or black: your choice. — Red or black: your choice. (Image credit: Rotor)

Rotor made a name for itself with its eponymous cranks and elliptical

The DTT bolts resemble basic set screws except that each end uses

One thing is for certain: our Rotor S1 sample stem is seriously

Inexperienced mechanics will want to take some care during installation,

Otherwise, Rotor's new S1 has emerged as one of our favorite ultralight

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