Stans No Tubes Arch MK4 Rear 29" MTB Wheel 12x148 SRAM XDR Tubeless Ready

The Stan's No Tubes Arch MK4 Rear 29 12x148 SRAM XDR wheelset is engineered for riders who demand versatility, durability, and top-tier performance on every trail. Whether you’re tackling all-mountain routes, downcountry challenges, or trailduro adventures, this wheelset provides the perfect balance of lightweight agility and rugged strength. Its 28mm internal rim width combined with a patented low-profile design offers exceptional climbing efficiency without compromising control and confidence on fast descents.

Built with 6069 aluminum and featuring reinforced spoke beds and a welded seam, the Arch MK4 rims deliver reliability in all conditions. The asymmetric design with offset spoke holes optimizes spoke tension and durability, creating a stronger, more resilient wheel. Thanks to Stan’s patented Bead Socket Technology (BST), you get an airtight tubeless seal that performs flawlessly, avoiding common inflation issues found in other asymmetric rims. Maintenance is straightforward too, with common spoke lengths front and rear simplifying repairs and replacements.

At the heart of this wheelset are the precision-engineered M-pulse hubs, crafted by Project321 in Bend, Oregon. These hubs feature 6 pawls with neodymium magnets for powerful engagement with minimal drag, ensuring rapid power transfer and smooth coasting. The hubs are built with premium Enduro bearings and 7075 aluminum axles for outstanding durability, while the fully shielded internals protect against dirt and debris. Adjustable preload settings let you fine-tune hub performance to reduce friction and maximize speed.

Designed to fit various configurations, the Arch MK4 supports Shimano Micro Spline, HG, or SRAM XDR freehubs and is compatible with 6-bolt or Centerlock brake rotors. Tubeless ready right out of the box with pre-installed rim tape and presta valves, this wheelset is ready to elevate your ride from the first pedal stroke. The Arch MK4 stands as the ultimate aluminum wheelset for riders who push their limits on every climb, descent, and trail.

What It’s Good For

• Climbing efficiently with a lightweight yet strong rim design
• Handling aggressive descents confidently due to reinforced construction
• Maintaining a reliable tubeless seal with Stan’s patented Bead Socket Technology
• Ensuring quick and smooth power transfer through M-pulse hubs with magnetic pawls
• Easy maintenance and repairs with standardized spoke lengths front and rear
• Compatibility with multiple freehub and brake rotor standards
• Riding a wide range of trail styles, from all-mountain to downcountry and trailduro

What It’s NOT Good For

• Use on non-mountain bike disciplines, such as road racing or BMX
• Riders seeking carbon wheelsets for weight savings or stiffness
• Those requiring wheels designed exclusively for downhill gravity riding
• Applications where tubeless setup is not preferred or feasible

Frequently Asked Questions

Are these wheels compatible with my SRAM XDR drivetrain?
Yes, the Arch MK4 Rear 29 is specifically designed with a SRAM XDR freehub, ensuring seamless compatibility with your drivetrain.

Can I use these wheels with disc brakes?
Absolutely. The Arch MK4 supports both 6-bolt and Centerlock brake rotor mounts, allowing you to choose the braking system that fits your setup.

Is this wheelset tubeless ready?
Yes, the wheels come with pre-installed rim tape and presta valves, making tubeless setup easy and reliable right out of the box.

How durable are the M-pulse hubs?
M-pulse hubs feature neodymium magnet pawls, Enduro bearings, and 7075 aluminum axles, offering exceptional durability and smooth engagement for years of trouble-free riding.

Can I service the wheels myself?
Yes, the Arch MK4 uses common spoke lengths front and rear, and Stan’s spokes are easy to source, making maintenance and repairs straightforward.