Phr System: Basics - DT SWISS CLASSIC Technical Manual

4.3 PHR SYSTEM: BASICS

Some of the DT Swiss wheels are equipped with the PHR system. The DT Swiss PHR (PRO HEAD
REINFORCEMENT) system consists of a washer and a specially shaped nipple. The shape of the washer (PHR
washer) acts as a ball joint and perfectly aligns the specially developed DT Squorx Pro Head® ball head nipple
in the direction of pull, minimizing the risk of spoke breakage.
MOUNTING OF THE PHR SYSTEM
1. Grease the contact surface of the PHR washer
and Squorx nipple with universal grease.
2. Slide the PHR washer onto the Squorx nipple.
See figure for orientation.
3. Push the spoke through hub and rim.
4. Screw the Squorx nipple onto the spoke.
5. Check the alignment of the PHR washer. The
bend of the PHR washer (2) must be within the
radius of the rim (1).
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