Ursus Arya G: PBO spokes damp vibration, rim stays a lean 25mm internal

Ursus isn't chasing internal width with the Arya G — it's staying at 25mm and putting the damping job on the spokes instead. Sapim RC-1 fibres flex where a steel or carbon spoke wouldn't, filtering harshness before it reaches the rim. The 79.67% figure is Ursus's own lab number against its own Proxima R 50, not an independent test — worth reading as a claim, not a settled result. The idea itself isn't new: Spinergy ran flexible PBO spokes decades ago in lightweight wheelchair wheels. What's new is pairing that fibre with a 2:1 Y-star lacing pattern and a purpose-built hub, aimed at riders who want a roadish, narrower platform rather than the wider-tyre route to comfort — a real alternative to volume, not obviously a replacement for it.

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