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Si arms are 172.5mm
Have no idea about the spider, but my guess is that a Hollowgram spider won't work with a SRAM arm - I briefly remember the engagement tooth pattern from some X1 cranks I had, so I understand where your coming from, but the SRAM spiders slot on and have three screws to keep them on rather than having a Lockring
Dick
Velodouche
@Dick What length are Si arms? Does anyone know if the 5 bolt spider works with new sram arms? If so could be interested in that also.