Magura Disc Brake Adaptor - QM41
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Merlin CyclesMagura Black Disc Brake Adaptor - / Qm41 / 180Mm Is Rear
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eBayMagura Caliper Mount Adapter QM 41 IS 180-R. 2700516
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Product Information
Full details
The Magura QM41 disc brake adaptor is an essential component for mountain bikers looking to upgrade their rear braking power by transitioning to a larger 180mm rotor. Designed specifically for frames with an IS (International Standard) 6-inch rear mount, this adaptor ensures precise alignment and secure mounting, though users should confirm their specific frame architecture is compatible with IS-to-Post mount configurations before installation.
All features
| Series | QM41 |
|---|---|
| Model Part Number | 2700516 |
| Brand | Magura |
Extended Product Information
FAQs
Can I use this for a 160mm rotor?
No, the QM41 is specifically engineered to bridge the distance required for a 180mm rotor on an IS 6-inch mount.
Does this adaptor come with mounting bolts?
The adaptor is designed to use standard disc brake mounting hardware. Check your existing caliper hardware or obtain the necessary M6 bolts.
Is this for the front or rear of the bike?
The QM41 is designed specifically for IS 6-inch rear mounts.
Can I use this with non-Magura brakes?
The adaptor is designed for IS-to-Post mount configurations, which are generally standardized, but it is optimized for Magura brake system geometries.
Does the weight affect bike handling?
At only 37 grams, the impact on handling is negligible.
Troubleshooting
Caliper alignment seems off after installation
Ensure the adaptor is fully seated against the frame mount. If alignment persists, check if the frame mounts require facing by a professional mechanic.
Brakes rub against the rotor
Loosen the caliper mounting bolts slightly, squeeze the brake lever, and then tighten the bolts while holding the lever to auto-center the caliper over the rotor.
Pros and Cons
Pros
- Enables powerful 180mm rotor upgrades
- Lightweight at only 37 grams
- Reliable, high-quality Magura engineering
- Simple, direct installation process
Cons
- Compatible only with IS 6-inch mounts
- Requires specific rotor size (180mm)
- Not suitable for frames with Post-mount frame interfaces
Setup, Compatibility & Care
Installation of the QM41 requires basic bike maintenance tools, specifically hex keys. Ensure the mounting surfaces on your frame are clean and free of debris before bolting the adaptor on. Use a thread-locking compound on the bolts to prevent loosening due to trail vibration.
Compatibility Checklist:
- Ensure your frame has an IS (International Standard) 6-inch rear mount.
- Confirm you are using a 180mm disc brake rotor.
- Check that your disc brake caliper is of the Post-mount style.
For care, periodically inspect the bolts for tightness and check the adaptor for any signs of mechanical fatigue or corrosion after riding in muddy or wet conditions.