FENRIR Bar End Mirror Adapter 801-0399 — CNC‑Machined Anodized Aluminium for Internally Threaded Handlebars, Secure Mount

This adapter converts standard original-threaded inside handlebar ends into a secure mounting point for FENRIR brand bar end mirrors. Machined from aluminum alloy and finished with an anodized surface, it’s designed for a clean fit, corrosion resistance, and consistent alignment with compatible mirrors. Note: it is only compatible with FENRIR bar end mirrors and not intended for other brands or aftermarket mirror stems.

How does the adapter attach to my handlebar?

The adapter threads into handlebars that already have internal threading at the end. Installation is straightforward: remove the existing end cap or plug, screw the adapter into the handlebar, and then fasten the FENRIR mirror onto the adapter. No complex cutting or drilling is required.

• Fits handlebars with existing internal threads
• Bolts in place — no welding or modification
• Compatible only with FENRIR bar end mirrors

What materials and processes ensure durability?

This adapter is manufactured from lightweight aluminum alloy and CNC-machined for consistent dimensions and a precise thread fit. After machining, an anodizing finish adds a protective, wear-resistant surface that helps resist oxidation and surface scratches during regular use.

• CNC machining for accurate tolerances
• Anodized coating for corrosion and wear resistance
• Aluminum alloy for strength with minimal weight

Will this affect mirror alignment or vibration?

When installed and tightened correctly, the adapter provides a stable mounting point that preserves mirror alignment. Because it’s a bolt-on solution designed for a matched mirror system, it helps maintain mirror position under normal riding conditions. Use proper torque and locking hardware supplied with your mirror for best results.

• Engineered fit reduces unwanted movement
• Works with matched FENRIR mirror geometry for stable sightlines
• Requires correct tightening to prevent looseness or drift

What do I need to check before ordering?

Confirm your handlebar ends have internal threads and that the mirror you plan to mount is a FENRIR bar end mirror model. This adapter will not fit handlebars without internal threading nor will it adapt non-FENRIR mirror stems. If in doubt, inspect the handlebar end or consult your motorcycle’s specifications.

• Verify internal threaded handlebar end exists
• Ensure mirror is a FENRIR bar end mirror model
• Check thread sizes on both handlebar and mirror if possible

This FENRIR adapter is ideal for riders who already own or plan to purchase FENRIR bar end mirrors and want a reliable, OEM-style mounting solution. It’s intended for mechanics, customizers, and motorcyclists who prefer a bolt-on installation using durable CNC-machined parts. If you need a universal adapter for multiple mirror brands or handlebars without internal threads, look for alternatives designed for wider compatibility.