The Industry Nine AR40 Solix SL Carbon Disc Wheelset is one of our top choices when we need a high-performing wheelset that can perform on the road or gravel. Featuring a super lightweight carbon fiber rib, an incredibly fast engaging Solix SL hub for technical performance, and 24 steel Sapim CX-Ray spokes for easy maintenance, the AR40 is a no-brainer. The set weighs in at just over 3 pounds for a super light construction, and the Solix SL hub features 605 points of engagement for lightning-fast engagement on technical climbs.