Skip the drag, and coast with ease!Stans newest innovation in bicycle hubs combines top-notch materials with a smart, magnet-driven, engagement system. M-pulse hubs have been reengineered from the ground up to have you rolling smoother, longer.

With Stans patented, BST-Asymmetric shape you can expect a top-of-the-line, reliable tubeless seal. While the durable 6069 alloy construction and reinforced spoke bed, combine to create an incredibly durable wheelset that builds confidence with every ride. Built with strength and easy serviceability in mind, the asymmetric rim allows for a single spoke length on both the front and rear wheels. Using traditional J-bend spokes and lacing for proven strength, ride quality, and serviceability for the life of each wheel.

A Magnetic Heart

What really sets Stans Flow MK4 wheelset apart from the crowd is the new, magnetic engaged M-Pulse hubs.Featuring an innovative and bombproof magnetic locking engagement system that provides an unbeatable smooth-rolling, no-drag ride.Unlike weaker pawl and spring designs, the M-pulse features six pawls with Neodymium magnets that offer virtually no resistance when coasting, andreliablylock into place quicker than standard spring-based pawls.

The heart of M-pulse hubs is the magnetic-locking engagement system based on the ground-breaking Project321 design. Manufactured in a small-batch, high-precision facility in Bend, Oregon, M-pulse freehubs feature six pawls equipped with Neodymium magnets engaging every 1.66. This design offers substantially more force than traditional spring-based pawl designs, and costs you much less drag when coasting. With decreased friction, Stans new M-pulse hubs spin more freely than any other hub on the market, and roll further, faster, with less effort, too.

Stans believes an innovative design is only as good as its materials and construction. So each detail of the M-pulse hub has been engineered to remove the weaknesses in traditional pawl and ratchet-style hubs.

Built to Last

Featuring 17mm axles, made of 7075 aluminum, rolling on long-lasting Enduro-brand bearings, plus a custom grease fill – Stans has taken every effort to optimize for low resistance and high durability.

Carefully engineered to eliminate weaknesses found in other hub designs, the hub is fully shielded, with no visible bearing seals, giving you superior protection when riding in any conditions. With just 1.66 of rotation needed to engage the M-Pulse hub, power is always there right when you need it!

M-pulse hubs also feature an adjustable preload that decreases drag and resistance for even less effort and more speed. This preload prolongs bearing life by allowing the hub’s bearing tension to be tuned with greater precision. A precision piece of equipment deserves the option of precise tuning, and the M-pulse hub’s adjustable preload, available on both the front and the rear hub, delivers exactly what youd want.

Tubeless-ready with rim tape and presta valve installed.

Stans original Flow redefined what you could expect a mountain bike rim to do. And now, the Flow MK4 gives you the power to do even more!

• Flow MK4 wheels include pre-installed tape for tubeless use and Presta valves.
• Low-profile 30mm internal width. Offering optimal 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 Stans legendary easy tubeless inflation with a stronger, more balanced wheel build
• M-pulse ultra-low drag magnetic pawl adjustable hubs with 1.66 engagement
• Enduro bearings with double-row freehub bearing
• Matched wheelsets use traditional J-bend lacing and share a single spoke length for easy serviceability
• Connection program includes 5-year hub warranty, 3-year rim warranty, 1-year crash replacement, and $10 donation to trail maintenance or advocacy group of your choice

Matchingfront wheel: Stan’s No Tubes Flow MK4 front wheel

Details:

Rear Hub:Stan’s/Project 321 M-Pulse hub

• Rotor: 6-bolt
• Hub spacing: Boost (12 x 148mm), SuperBoost (12 x 157mm)
• Freehub: Shimano HG, Shimano Micro Spline, SRAM XDR (SRAM XD with included spacer)
• Points of engagement: 216

Rim: Stan’s Flow MK4

• Rim Size: 27.5″, 29″
• Material: 6069 Aluminum Alloy
• Hole: 32h
• Internal width: 30.0mm
• External width: 33.6mm
• Tire width: 2.3 – 2.6″

Spoke:

• Sapim D-Light, 2.0/1.65/2.0
• # of spokes: 32
• Sapim double square alloy nipples

Weight:

• Wheelset: 1792g (27.5″), 1882g (29″)
• Rear wheel: 972g (27.5″) / 1017g (29″)