Rohloff Disc Brake Adapter for 203 mm Rotors

Dissipate torque with Rohloff support adapters

With all gear hubs, the axle tries to rotate while you're riding. When riding in a lower gear (1-10), the axle wants to turn backwards. When riding in a higher gear (12-14), the axle wants to turn forwards. The torque with which the axle tries to turn is called the support torque. The size of the support torque depends on the load and the engaged gear, and must be absorbed by an appropriate anti-rotation device on the frame. With the simple three-speed hub, a flat-milled axle in the dropouts is sufficient. With a high-performance gear hub such as the Rohloff Speedhub 500/14, the support must be much more stable because of the large gear range.
To transfer the torque of the Speedhub to the frame, support adapters and a matching axle plate are required.

Technical Information:

Adapter Material:

Aluminium

Bolt Material:

steel

Rotor Size:

203 mm

Models:

PM to PM:

• Frame Mount: post mount 7"
• Caliper Mount: post mount
• Installation Height: 23 mm
• Compatibility: 135 mm, 142 mm, 148 mm, 170 mm, 177 mm dimensions
• Type: PM Bone
• Manufacturer Number: 8555

Technology:

PM Bone
The Rohloff PM Axle Plate in combination with the PM Bone allows mounting on 135 mm, 142 mm, 148 mm, 170 mm or 177 mm frames with disc brake mount according to the post mount direct standard. Here the fixing points for the brake cylinder of post mount direct disc brake mount (either on the seatstay or chainstay) are used for torque support with the PM Bone. The Rohloff PM Bone must be mounted on the mounting points of the disc brake mount. This functions like an adapter and thus changes the required brake rotor size to a larger diameter. Mounting on 5" or 8" brake mounts is therefore not possible.

The following conditions must be met for the safe installation of the PM axle plate and PM Bone: the Rohloff PM axle plate must lie flat against the frame in the area of the axle plate (R20 / 40 mm) and must not collide with other frame parts (e.g. weld bead). Only then can the PM axle plate and PM Bone be installed without causing further issues.

It is also possible to mount it on frames with IS disc brake mounts on the chainstay. First, an IS-PM adapter is mounted to the mounting points of the IS disc brake mount. The Rohloff PM Bone can then be screwed onto this IS-PM adapter.

Caution:
The use of the PM Bone as well as the PM axle plate is not tested for tandem use and therefore not approved!

Contents:

• 1 x Rohloff 203 mm disc brake adapter
• 2 x bolts