Galfer Post Mount Caliper Adapter

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)