The PM Bone is mounted between the frame and brake caliper and thus acts like a + 20mm adapter, which requires the use of each 20mm larger disc.
Examples of possible combinations:
- Frames with PM direct support for 160mm disc = PM Bone with 180mm 4-hole Rohloff brake disc.
- Frames with PM direct support for 180mm disc = PM Bone with 203mm 4-hole Rohloff brake disc.
- Frames with PM direct support for 140mm or 203mm disc = not compatible!
Included in delivery: 1 PM Bone











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