Stans No Tubes Flow S1 27.5-inch Wheelset

Burly enough to handle the toughest of trails, yet light enough to pedal all day the Flow S1 is up for any challenge. Developed from rims ridden in Red Bull Rampage and raced on the World Cup DH circuit for years the S1 is now ready for action. With a 1.6mm deeper profile and reinforced rim walls the new Flow S1 offers greater impact strength, for an even wider range of use, with only a minor weight gain. Strong and light 6061 alloy rims, stainless steel rim eyelets, and easily replaceable standard spokes mean the Flow S1 is built to last. Combined with faster-engaging, CNC-machined Neo hubs available in configurations to fit nearly any bike, the Flow S1 is the ultimate trail, all-mountain, and enduro wheelset.

Technology

Stan's No Tubes Neo Hubs

Our original Neo hub has evolved to be stronger and more reliable than ever. The additional stress of larger cassette cogs, more capable bikes, and even more challenging trails led us to create the Neo with Durasync and Neo Ultimate with Speedsync.

From its debut in 2015, the Neo has performed at the highest levels of racing in the most extreme conditions, but constant quality feedback from our teams helped us make it even better. Both Neo and Neo Ultimate now feature triple freehub bearings for increased axle stability to handle even greater vertical and torsional loads. The Neo Ultimate with Speedsync maintains the nearly instant 5-degree engagement of 6 pawls engaging three at a time. The Neo’s Durasync system engages all 6 pawls simultaneously for unrivaled durability.

Neo DuraSync:

• CNC machined hub shell for strength and precision
• Fast Durasync 10-degree engagement
• Simultaneous 6 pawl engagement for maximum durability
• Triple freehub bearings provide axle stability to handle higher vertical and torsional loads
• Wide bearing stance and axle design reduce flex and add durability
• Low-drag main seal prevents contamination and reduces resistance
• Laser-etched SealLock end caps lock into place and roll smoother

Neo DuraSync specification:

• Durasync system engages 6 pawls simultaneously Forged steel 36t ratchet ring for 36 points of contact, 10-degree engagement
• 100% precision CNC machined hub shell
• Chromed steel bearings with triple freehub bearing axle support
• Wide stance bearing placement in freehub for more strength and support
• Co-molded, high durometer main seal
• Seven step swaged and centerless ground axle for strength and precision
• Forged steel 36t ratchet ring for stronger grain structure
• Slip-fit axle end caps for easy conversions
• Axle Options:
• Front: 9x100mm QR, 9x100mm TA, 12x100mm TA, 15x100mm TA, 15x110mm TA, 20x110mm TA, RockShox TC 100 TA, RockShox TC 110 TA, 15x135 TA, 15x150 TA *
• Rear: 10x130mm QR, 10x135mm QR, 10x135mm TA, 10x135mm Bolt-on, 12x135mm TA, 12x142mm TA, 12x148mm TA, 12x150mm TA, 12x157mm TA, 12x177 TA, 10x170 QR, 12x197 TA, 10x190 QR *

*Some wheelsets not available in every axle configuration.

• Cassette Options: Shimano/SRAM, SRAM XD, or Campagnolo
• Brake Options: 6 bolt IS, Centerlock®

Stan's No Tubes Bead Socket Technology (BST)

Bead Socket Technology rims are designed to match the shape of your tire's bead to create a safer and more secure air tight interface. Unlike the secure “socket” of a BST design, conventional rim shapes drive the bead of the tire down deeper into the rim, putting pressure on sidewalls that causes friction, restricts tire volume, and keeps the interface from forming a sufficient seal for tubeless use. BST rims secure the bead of the tire, not the sidewall, creating an air tight seal while allowing the tire's sidewall to expand to its true, rounder, more effective profile. The result is more traction and less rolling resistance. With lower-profile, less vulnerable sidewalls, our BST rims are also lighter and stronger by design, and accelerate more quickly.

Stan's No Tubes WideRight Rim Design

The most important piece to the bicycle-terrain interaction is the contact patch between the tire and terrain, so tire profile and tire pressure play huge roles in bicycle performance and overall handling. But many rims just don't work well with the tires we're all using. Rims that are too narrow fail to offer sufficient sidewall support and protection to your tires and create a less stable shape. The result is less control in the corners, less traction on climbs, and more rolling resistance. Rims that are too wide also distort the tire profile, decreasing traction and control and driving impacts directly into the rim, negating the impact absorbing advantages of a tire's volume. Our WideRight rim widths are designed to strike the perfect balance between tire volume and sidewall function.

The Lightbulb.

Too narrow. Tire is constricted, robbing traction and cornering stability.

The Bell.

Too wide. Tire beads are pushed wide, deforming intended tire shape and tread design. Tire has less ability to absorb impacts and less cornering control, and sidewalls are exposed to cuts.

WideRight.

The perfect width. Tire expands to full volume without distortion. Tread pattern and side knobs are in the correct position for cornering, maximum traction and control with minimum rolling resistance.

WideRight rim profiles allow the tire to achieve its proper shape, and that's the foundation for a great handling, fast-rolling, and responsive bike.

Stan's WideRight system makes it easy to find the perfect rim width for the tire size and volume you ride. Too narrow of an internal rim mixed with a high sidewall design gives you a "light bulb" tire profile while an ultra wide rim on a narrower tire will give you a flat to "bell shaped" tire profile. Neither of these scenarios give optimal tire profiles nor allows the tire to perform as intended.

WideRight profiles provide the optimal volume without distorting the tread pattern or the side knobs so each part of the tire is in the correct position for rolling and cornering, allowing for maximum traction and control as well as offering minimal rolling resistance. The WideRight profile advantages don't stop there. Proper tire profiles not only allow for optimal tire performance but also allow the tire to do its secondary job of protecting the rim as well as the tire's sidewall. A flat or bell-shaped tire profile leaves the tire exposed to sidewall cuts and creates undue chances for rim damage.

Key benefits:

• Optimises tire profiles
• Maximizes traction
• Properly distributes tire volume
• Promotes the design intent of the tire profile and overall tire performance
• Reduces tire pinch flats and sidewall damage
• Allows tire to protect rim

E-Sync Hubs

Strength and durability were the main priority in designing E-sync hubs. Designed for more aggressive riders, wet environments, and the added torque and weight stresses of eBikes, E-sync hubs are built to last. The cromoly axle and Enduro sealed bearings of the E-sync can handle high loads and harsh conditions, and the double row Enduro bearing at the heart of the E-sync's freehub lasts longer than simply pairing two standard cartridge bearings side-by-side. The 6066 alloy shell and heat-treated steel ratchet ring add further durability, allowing the E-sync to boast a 47% higher max torque capacity than previous Neo hubs.

Beyond materials, the E-sync's durability and reliable engagement relies on smart details like a pawl angle and new longer pawl shape that channels stress away from the bearings and into the strongest, most reinforced areas to drastically improve both bearing life and overall hub durability. The E-sync's flange spacing and design also balances spoke tension between each side of the rim better. It all works together to make the E-sync hub stronger and more durable. And with 8.18° engagement, the E-sync hub is as fast as it is strong.

Available with Shimano Micro Spline, HG, or SRAM XDR freehub, and 6-bolt or Centerlock brake style, with options to fit all popular axle configurations.

Key benefits:

• Cromoly axle and full Enduro bearings with double-row freehub bearing for years of trouble-free performance and eBike compatibility
• Fast 8.18° engagement with reinforced high-torque capable pawls
• Matched wheelsets use traditional J-bend lacing and share a single spoke length for easy serviceability
• Backwards-compatible to accept Neo end caps, offering options to fit every popular axle style

Features

• Durable and lightweight aluminum construction
• Wider rim width for more stability with larger tires
• 3mm wider than Rapid 30 with no weight gain
• Developed on the World Cup DH Circuit
• Rim profile optimized for 2.35” - 2.80” tires

Specification

• Rim Internal Width: 29.0mm
• Rim External Width: 33.1mm
• Rim Depth: 17.6mm
• Spokes: Sapim Race Black 2.0/1.8/2.0mm
• Nipples: Secure Lock Brass Silver Nipples
• Hub: Neo with Durasync
• Hole Count: 32-hole
• Rim Material: 6061 Alloy
• Rim Color: Black
• Hub Color: Black
• Brakes: Disc
• Valve: 35mm Presta
• Rim Weight: 548g
• Wheelset Weight: 2002g
• Front Wheel Weight: 940g
• Rear Wheel Weight: 1062g
• ERD: 566mm
• ETRTO: 584 x 29.0mm
• ISO: 27.5" x 33.1mm
• Tape: 30mm
• Max Spoke Tension: 125kgf (1225N)
• Max Pressure with 2.40" Tire: 37psi
• Max Pressure with 2.80" Tire: 26psi
• Max Rider Weight: 250lbs (113 kilo)

Included

Flow EX3 wheels include pre-installed tape for tubeless use and presta valves.