Design Promises a New Level of Reliability for Enduro, Downhill and Trail Bikes

BIG FLATS, NY (March 18, 2019) - Stan’s NoTubes is proud to introduce the new Flow EX3, an extremely durable new line of rims and wheelsets designed for downhill, enduro and the most demanding trails. Based on the legendary Flow EX, the new Flow EX3 rim features Tiebeam, an internal reinforcement that offers unmatched impact resistance and the best air retention of any tubeless rim. The Flow EX3 combines the incredibly durable Tiebeam design of Stan’s classic Flow EX with the 29mm internal width and 6069 aluminum construction of the popular Flow MK3 to create an entirely new rim built to handle today’s faster, heavier and more capable enduro, downhill and e-bikes. While still delivering the outstanding ride quality for which all Stan’s rims have come to be known, the new Flow EX3 is unapologetically focused on descending, speed, air retention and durability.

New Flow EX3 Side View

Stan’s has supplied rims to Downhill World Cup and Enduro World Series teams for years, but the Flow EX3 is the first rim specifically designed from the ground up to handle these more severe riding conditions, and it is already a proven winner. In late 2018, GT Factory pro rider Martin Maes rode a Flow EX3 rear wheel to a win at the Enduro World Series round in Whistler and then to a World Cup Downhill victory in La Bresse.

Martin Maes Wins EWS Whistler on Flow EX3

For 2019, look for Flow EX3 rims and wheels on the bikes of the Rachel, Gee and Dan Atherton, the GT Factory Racing Team and the Propain and Cannondale Factory Racing teams.

the Athertons

Photo: Moonhead Media

Flow EX3 rims and wheelsets are in stock and shipping to favorite local bike shops. They are also available from distributors and directly from notubes.com.

Rims

During extensive testing of Stan’s and competitors’ rims during the development of the Flow EX3, the key advantage of Stan’s successful Flow MK3 rim, released in April 2016, was determined to be its 6069 aluminum construction, which is 10-15% stronger than the more commonly used 6061 alloy. The Flow MK3’s radially compliant rim shape and 29mm internal width also tested extremely well. More surprising was the strength of Stan’s classic Flow EX rim, which used internal reinforcements to create a triple-cavity design. Though not made of the more durable alloy, and narrow by today’s standards, the old Flow EX demonstrated amazing strength during testing. Combining the best of these designs, increasing wall thickness at the spokes and utilizing a new “BBQ” shot-peened finish created a rim that exceeded all testing goals and proved much stronger and more impact resistant than any other. This is the new Flow EX3.

Flow EX3 Rim

More than just strong, the Flow EX3 rim is designed to prevent air loss. Even when used with a tire insert, huge impacts can cause the sidewall of most rims to fold, causing air loss and eventual failure, but the Tiebeam internal brace and patented low-profile sidewalls of the Flow EX3 resist this folding, maintaining air pressure and structural integrity better than any other rim, even under the most severe impacts.

The Tiebeam design also allow tremendous strength increases with only minimal weight increases. The 27.5” Flow EX3 rim weighs 580g, while the 29” version weighs only 618g.

Like all Stan’s rims, the Flow EX3s are easy to set up tubeless. Thanks to Stan’s proven Bead Socket Technology, all that’s needed is a floor pump. Optimized for 2.35” to 2.8” tires, the Flow EX3 expands the Flow line to handle the most aggressive riding. Every Downhill World Cup and Enduro World Series ride, every hour of testing, riding and improving, it’s all here in the new Flow EX3.

Wheelsets

Building the Flow EX3 wheelset starts with Stan’s Neo OS front and rear hubs. The Neo OS front hub features larger bearings than conventional Neo hubs, while still being compatible with both 20mm and 15mm forks. The Neo OS rear hub rolls on a steel axle for increased durability and includes a Durasync freehub with reliable, simultaneous six-pawl engagement.

The Flow EX3 wheelset continues Stan’s tradition of using readily available, non-custom j-bend spokes in lengths that are commonly in stock in bike shops around the world. The Flow EX3’s Sapim D-Light spokes keep rotating mass to a minimum and offer exceptional strength, while Sapim’s Secure Lock alloy nipples provide a mechanical lock to resist loosening.

Flow EX3 wheelsets are available for Shimano or SRAM XD cassettes and all current axle systems, including 110mm front and Boost 148mm, 150mm, and Super Boost Plus 157mm rear spacing. New for 2019, a Neo OS front hub with wider flanges is also an option to fit forks that require the wider “20x110 Boost” disc brake spacing.

Complete Flow EX3 wheelsets come ready to set up and ride with pre-installed rim tape for tubeless use and presta valves. 15x110mm OS front wheels also come with an additional set of 20mm OS Boost end caps.

Flow EX3 wheelsets are available in stock and custom configurations. Decal colors and build configurations can be specified using Stan’s Custom Wheel Builder at notubes.com/custom-wheelset.

Videos

GT Factory Racing's Martin Maes won the Enduro World Series in Whistler and the World Cup Downhill in La Bresse on his Flow EX3 rear wheel. Maes played a key role in the development of the new rim and wheelset and is ready for the 2019 season.

Three-time North American Enduro Tour winner Kyle Warner has raced most of his career as a privateer and one of the key characteristics he looks for in his equipment is durability. When he found out the new rim designed for maximum durability was finally ready, Kyle couldn't think of a better place than Bootleg Canyon to put the Flow EX3 through the paces.

To develop the new Flow EX3, we created an incredibly brutal testing procedure based on impact forces we studied from the Mont-Sainte-Ann World Cup DH course. The Flow EX3’s Tiebeam design means greater structural integrity, fewer dents and the best air retention in the industry. How much stronger were we able to make the new rim? Here's how competing rims and the new Flow EX3 performed in our catastrophic impact test.

Warranty

Flow EX3 rims come with a two-year warranty and one year of no-fault crash replacement.

Specifications

Flow EX3
Uses: Enduro & Downhill
Internal Rim Width: 29.0 mm
External Rim Width: 32.6 mm
Rim Depth: 17.9 mm
Optimal Tire Sizes: 2.35” to 2.8”
Hubs: Stan’s Neo OS with Durasync
Spokes: Sapim D-Light Black 2.0/1.65/2.0mm
Nipples: Sapim Secure Lock Alloy Black
Hole Count: 32-hole
Drilling Style: Symmetrical
Rim Material: 6069 Aluminum Alloy
Rim Color: Black Bead Blasted Finish (BBQ)
Hub Color: Black
Brakes: Disc only
Wheelset Weight: 2,018 g (27.5") / 2,115 g (29")
Rim Weight: 580 g (27.5") / 618,g (29")
Front Wheel Weight: 932 g (27.5") / 981 g (29")
Rear Wheel Weight: 1,085 g (27.5") / 1,134 g (29")
ERD: 564 mm (27.5") / 602 mm (29")
ETRTO: 584x29.0 (27.5") / 622x29.0 (29")
ISO: 27.5"x32.6 mm / 29"x32.6 mm
Tape: 30 mm
Valve: 35 mm Presta
Max Pressure Tire Pressure: 37 psi (2.4”), 26 psi (2.8”)
Max Rider Weight: 250 lb (113 kilo)
Max Spoke Tension: 125 kgf (1,225 N)
Wheelset MSRP: $699
Rim MSRP: $115