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CNC-machined aluminum adapters designed for securely upgrading to oversize brake rotors on post mount systems.
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The GALFER Post Mount Adapter Series allows you to adapt your brake calipers to larger disc rotors on bikes using radial/post-mount (PM) systems. Whether you’re upgrading from 160mm to 180mm, 203mm, or even 223mm rotors, these CNC-machined aluminum adapters ensure precision alignment, reliable braking, and rigid support under high torque.
Each adapter is made from anodized aluminum, ensuring light weight and corrosion resistance. This system uses four bolts during installation — two for securing the brake caliper and two for fixing to the fork (front) or frame (rear). Two bolts are included in the package.
⚠️ Important Safety Notice:
Installation should be carried out by a professional. GALFER does not recommend using IS (axial) adapters for brake rotors over Ø180mm. GALFER is not responsible for any damage caused by improper installation or incompatible components.
PRODUCT FEATURES
CNC-machined aluminum adapter with black anodized finish
Post mount to post mount (PM-PM) compatibility
Designed for rotor upgrades from 160mm up to 223mm
Uses 4 bolts (2 caliper + 2 frame/fork); 2 bolts included
Compatible with MTB, e-MTB, enduro, downhill setups
Lightweight, rigid, and corrosion resistant
Available in +20 / +23 / +43 / +63 / +83mm offset variants
SPECIFICATIONS
Material: CNC aluminum adapter with steel mounting bolts
Color: Black
Mount Standard: Post Mount (fork/frame/caliper)
Intended Use: Front or rear brake rotor upgrade
Installation: 4-bolt system (2 bolts included)
RECOMMENDED ROTOR SIZES (BASED ON FORK/FRAME WITH NO ORIGINAL ADAPTER):
SB001 (+43mm):
From 160mm → 203mm
From 180mm → 223mm
Weight: 21g (without bolts)
SB002 (+20mm):
From 160mm → 180mm
From 180mm → 200mm
From 203mm → 223mm
Weight: 23g (without bolts)
SB003 (+63mm):
From 160mm → 223mm
Weight: 38g (without bolts)
SB004 (+23mm):
From 180mm → 203mm
From 200mm → 223mm
Weight: 36g (with bolts)