Since 2007, the Flow rim has been helping cyclists make progress, push their limits, and achieve more on their bikes. The original Flow was lightweight, wide, tubeless, and incredibly stable. It redefined MTB rims and played a significant role in the evolution of cycling. The current Flow MK4 continues this evolution with an asymmetrical rim that is 30 mm wide, designed to create an even more resilient wheel. The durability and an almost unbelievable sense of control on the trails have made Flow rims the preferred choice for many Red Bull Rampage riders, and today's Flow takes it a step further. The reinforced spoke bed of the Flow MK4, combined with the offset drilling design of its asymmetrical construction, results in an incredibly durable wheel that instills more confidence on every ride. Unlike many asymmetrical rims, the BST-asymmetrical shape of the Flow MK4 is designed to equalize resistance to impacts and the seating of the tire bead on both sides of the rim, even in the worst rock fields and the most challenging corners. Combined with Stan's patented Bead Socket technology, the Flow MK4 offers the easiest tubeless setup and the most reliable waterproof performance on the trail. Accelerate your progress and enhance every ride with the confidence of the asymmetrical Flow MK4 rims.