"The new Ursus Arya G gravel and all-road wheels are built around the new Sapim RC-1 PBO spokes connecting new rims and hubs. The combination debuted at Paris-Roubaix under Team Picnic-PostNL, helping smooth the cobbles thanks to the spokes' ability to compress and absorb impacts."
"PBO (Polyphenylene Bensobisoxazole) is a synthetic fiber from Applied Fiber that's flexible, but not stretchable. Meaning, PBO spokes allow the wheel to compress radially to soak up impacts and vibration, but not flex laterally."
"Sapim's RC-1 spokes are just 1.9g each (260mm length) and are made of 16,000 PBO fiber filaments with a UV-resistant outer sheathing. They use specialized nipples that install and true like normal, but are ~5.5mm thick, requiring the rim to have slightly bigger holes."
"The spokes themselves are round, measuring 2.2mm in diameter, making them better suited for rough surface rides where aerodynamics play second fiddle to comfort and traction. Ursus' OmniTune System (OTS) means a custom build with the straight-pull Ursus U-RG60 hub using their Y-stars (2:1) lacing pattern, going to a 50mm deep, 31mm wide (external) carbon rim."
Sapim RC-1 PBO spokes are used in new Ursus Arya G gravel and all-road wheels built with new rims and hubs. The spokes help smooth cobbles by compressing and absorbing impacts and vibration while not flexing laterally. PBO stands for Polyphenylene Bensobisoxazole, a flexible synthetic fiber that is not stretchable. The spokes weigh 1.9g each at 260mm length and use 16,000 PBO fiber filaments with UV-resistant outer sheathing. Specialized nipples install and true like standard nipples but require slightly larger rim holes. The round 2.2mm diameter spokes prioritize comfort and traction over aerodynamics. The wheel build uses a straight-pull Ursus U-RG60 hub with a 2:1 Y-star lacing pattern and a 50mm deep carbon rim.
Read at Bikerumor
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