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Stan’s NoTubes introduces Flow EX3 Rims and Wheelsets


Stan’s NoTubes has introduced the new Flow EX3, a durable new line of rims and wheelsets ‘designed for downhill, enduro and the most demanding trails’. Based on the brand’s Flow EX, the new Flow EX3 rim features Tiebeam, an internal reinforcement that offers impact resistance and ‘the best air retention of any tubeless rim’.

The Flow EX3 combines the durable Tiebeam design of Stan’s Flow EX with the 29mm internal width and 6069 aluminium construction of the popular Flow MK3 to create an entirely new rim. The company adds that this is built to handle today’s faster, heavier and more capable enduro, downhill and e-bikes.

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.

For 2019, Flow EX3 rims and wheels will feature on the bikes of the GT Factory Racing team, Atherton Bikes team and the Propain Factory team.

More than just strong, the Flow EX3 rim is designed to prevent air loss. Even when used with a tyre insert, huge impacts can cause the sidewall of most rims to fold, causing air loss and eventual failure. To help compensate, the Tiebeam internal brace and patented low-profile sidewalls of the Flow EX3 resist this folding. This helps to maintain air pressure and structural integrity.

Optimized for 2.35” to 2.8” tyres, the Flow EX3 expands the Flow line. The Tiebeam design also allows strength increases with only minimal weight increases. The 27.5” Flow EX3 rim weighs 580g, while the 29” version weighs 618g.

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 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 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 ‘20×110 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.

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

Wheelset MSRP: US$699
Rim MSRP: US$115

Stan’s NoTubes, founded and owned by Stan and Cindy Koziatek, forged a path for making mountain bikes tyres tubeless. Stan Koziatek devised the original NoTubes sealing system in 2001, the same system that today has become a preferred tubeless conversion system around the world. Stan’s NoTubes currently designs, produces and sells innovative mountain bike, road and cyclocross wheels, rims and hubs as well as a range of products for tubeless conversion.



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