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Artikel veröffentlicht unter:
July 11, 2026
Darimo Nexum integrated bars use two M4×16 bolts at the stem faceplate — steel from the factory, in plain view every time you look down. Titanium replacements weigh 1.4g each (2.8g per pair). Here is what you need to know.
On a cockpit already among the lightest in road cycling, the remaining grams are at the margins. The visual payoff — matching titanium hardware across every exposed bolt head — is the bigger reason.
Frequently Asked Questions
What bolt size does a Darimo stem use?
M4×16 — two bolts total, one on each side of the steerer clamp. Both Nexum and Nexum Drag use identical hardware. Grade 5 Ti-6Al-4V replacements match thread pitch and length, weighing 1.4g each vs roughly 1.5–2g each for steel.
Is titanium safe in a stem faceplate?
Stem bolts see constant vibration and braking loads. Grade 5 titanium provides roughly 900–950 MPa tensile strength — comparable to the high-strength steel used in bicycle fasteners. The limiting factor is the aluminum threads in the stem body, not the bolt material itself. Torque to Darimo's specification (typically 4–5 Nm for M4), apply a light dab of grease to prevent galling, and clamp force is identical.
How much weight does it save?
Two M4×16 steel bolts on a high-end stem weigh roughly 3–4g per pair. Titanium equivalents at 2.8g per pair save roughly 1–2g. On a 150g bar-and-stem combo, that's margin territory — but cockpit weight is feel-weight, not scale-weight.
Does bolt head appearance matter?
On an integrated cockpit, stem faceplate bolts sit fully exposed — no covers, no caps. CNC-machined titanium bolt heads with consistent hex geometry and eight anodized color options create a unified look with every other titanium fastener across the bike. The visual consistency across all exposed hardware is the upgrade's strongest argument.
Install tips?
Remove one bolt at a time to keep the faceplate aligned. Apply a thin film of grease on titanium threads. Torque evenly to Darimo spec. Check both bolts are at equal tension after the first ride.
