Product Details

The original Flow was light, wide, tubeless, and strong as hell. It redefined mountain bike rims and played a role in the evolution of riding. Today's Flow MK4 continues the progression with a 30mm wide asymmetric rim designed to build an even stronger overall wheel.

The Flow MK4’s reinforced spoke bed, combined with the offset drilling of the asym design, builds into an incredibly durable wheel that brings added confidence to every ride. The Flow MK4's BST-Asymmetric shape is designed to equalize resistance to dents and tire bead retention on both sides of the rim under even the worst rock gardens and hardest cornering. Combined with Stan's patented Bead Socket Technology, the Flow MK4 rim offers the easiest tubeless setup and most reliable airtight performance on the trail.

• Low-profile 30mm internal width optimizes tire shape, traction, and control for 2.3-2.6” tires
• Durable 6069 aluminum with welded joint and reinforced spoke bed
• BST-Asymmetric design combines Stan’s legendary easy tubeless inflation with a stronger, more balanced wheel build
• Most trusted tubeless system for easy setup and low maintenance
• Rim Internal Width: 30.0mm
• Rim External Width: 33.6mm
• Rim Depth: 18.9mm
• Hole Count: 28 and 32-hole
• Material: 6069 Aluminum Alloy
• Brakes: Disc only
• Rim Weight: 487g (27.5"), 521g (29")
• Tape: 33mm
• Valve: Presta
• Max Pressure with 2.30" Tire: 39psi
• Max Pressure with 2.60" Tire: 34psi
• Colour: Black

About Stans NoTubes
In 2001, Stan’s NoTubes developed a method to replace inner tubes with a liquid sealant to repair punctures instantly. For over two decades, Stan’s NoTubes products have set entirely new performance standards while creating new product categories, redefining what others thought was possible.