The short answer
If you removed the bar-end weight on your Moto Guzzi and found a solid, welded piece with a threaded hole instead of a hollow tube — congratulations, nothing is wrong with your bike.
That welded insert is the mounting point. It's an M6 threaded boss that Moto Guzzi welds into the factory handlebar to hold the bar-end weights. Our Moto Guzzi bar-end mirrors are designed to bolt directly into that same M6 thread. No drilling, no expander wedges, no handlebar swap.
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First confirm the mounting bolt is not bottoming out before the mirror base is secured—a bolt can feel fully tight while the mirror stays loose. This usually means the bolt is longer than the available threaded depth.
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Remove the original handlebar end weights from handlebar grips and see if your handlebar ends are as following:
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How do I know if this aftermarket mirror fits my sportsbike?
Measure it first. Here is how.
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These shiny tiny decorative caps can easily give your bike a clean look by covering Allen head bolts while protecting them from rust.
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The short answer
Remove your bar-end weight or cap and look inside the handlebar. What you see decides everything:
- Threads inside (a bolt hole, or a welded insert with a female thread) → choose bolt-on hardware that matches the thread size (M5, M6, M8, M10, M12, M16 or an OEM-specific bolt).
- Clean hollow tube → choose expander hardware that matches the tube's inner diameter.
- Completely solid, no opening → bar-end mirrors can't mount here without modification; consider our handlebar-mount mirrors instead.
Not sure which you have? The guide below shows how to identify and measure each type in about 30 seconds.
Remove the original handlebar end weights or caps from handlebar and see if your handlebar ends are as following:
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We sometimes have people asking the difference of Harley touring clutch lever between year 2016('14~'16) model to year 2017('17~) model.
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