| Body Material | Aluminum | Upper Bearing Size | |
| Lower Bearing Size | | Crown Race Size | ISO (26.4mm) |
| Upper Cup Markings | | Lower Cup Markings | |
Available Threading  | English/ISO/Italian (25.4mm x 24TPI);
French (25mm x 1mm) | Stack Height | |
JPR was the brand of Jean-Paul Routens. Jean-Paul Routens is the son of the famous french constructeur Jo Routens. He took over his fathers shop based in Grenoble (F) in 1975. He retired in 2014.
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