MT ZOOM Ultralight steerer top cap with integrated stem bolt. A weight weenie delight … the ultimate ultra lightweight integrated aluminium top cap and bolt. In total weighing less than 5g.

Available in black, red & gold (note: the gold also has Montane Kielder 100 branding)

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The bolt hole is sensibly big. Deep at 8mm and takes a 5mm allen key.

When you are setting this up, don't over tighten as the bolt hole is aluminium and less resilient than steel.  If you need to rachet/compression down a headset use a steel top cap first and then replace with the Mt Zoom one.