Best Best Keeps Getting Better.
We've seen the 808 NSW under the world's fastest road races and triathletes garnishings wins around the globe. Their feedback has been essential in the development and Zipp now has upped the ante with a tubeless-ready rim and disc brakes to the 808 NSW Carbon Disc Brake Road Wheelset. The base 808 NSW was already quite fast with a newer carbon layup and better braking than the 808 Firecrest. This wheelset obviously brakes even better and the ability to run tubeless tires lets you ride with a lower pressure for a more comfortable and even faster rolling ride.
The addition of disc brakes does make the wheel heavier, but a slight weight gain isn't much of an impediment when the 808 NSW is used for its intended purpose: holding speed on long TTs and 112-mile bike legs. And anyway, the 808 NSW's refined carbon lay-up earns the set a claimed weight that's 75g lighter than the 808 Firecrest. Since those weight gains don't sacrifice durability and the tubeless rim reduces the risk of punctures, the 808 NSW also reduces the risk of you either having to change a flat or abandoning altogether with a catastrophic rim failure à la Sky at TA in 2017.
Despite the advancements to the rim, which is the element of the wheel that Zipp's tagline of "Speed Weaponry" is typically associated with, we're actually most excited about the Cognition hub. Blasphemy, we know, but the Cognition makes a strong case for itself. We'd even go so far to suggest that the NSW's Cognition rear hub may be the most exciting innovation we've seen in factory wheels since Zipp first introduced its bulging sidewalls. The hub owes its sex appeal to Zipp's Axial Clutch freewheel design, which features two Metal Injection Molding (MIM) ratcheting rings—one mated to the freehub body and one mated to the hub body. The two rings are machined like a ratchet, so they ramp off of each other while freewheeling but engage each other during pedal input.
Compared to a standard pawl design, which actually resembles a drum brake and engages from the inside out, the Axial Clutch's MIM rings engage laterally to reduce friction, so the engagement mechanism itself doesn't tax as many watts from your efforts. We're familiar with this model, as we've seen similar mechanisms on the designer hubs featured in top-end custom builds for years now, but Zipp is the first to replace the usual tensioning agent, steel springs, with magnets. This substitution further reduces friction between the ratcheting rings, making for what may be the smoothest freewheel on any mass-produced wheel. It also carries the added bonus of sounding really, really cool. The Cognition's Axial Clutch system emits an aggressive, ominous growl compared to the typical Zzzzzz of pawls. It's a design that we suspect will eventually be the norm, but—once again—Zipp is leading the charge.
Shiny new hubs aside, we'll get back to the subject you probably (and rightfully) expected to be the headline for a new Zipp wheel: the rim. The brand's signature Aerodynamic Boundary Layer Control (ABLC) dimpling returns with a new designation. It's called SawTooth Technology, and it consists of ABLC dimples applied in a single pattern repeated in 12 discrete swathes (or "nodes") across the rim's surface, looking much like the strokes of a paintbrush. Zipp's description of SawTooth's effect is a bit erudite, with the company claiming a 34% reduction in side wind forces compared to the previous ABLC pattern. It achieves these gains by "reducing the laminar bubble effect on the aerodynamically shielded side of the rim's profile." Translated into saddle speak, that means while rolling at 20mph and above, the rim's dimpling is designed to dispel the negative, drag-inducing force on the rim's non-wind side.
SawTooth's premise stems from 42 computational fluid dynamics studies and testing that spilled out of the wind tunnel onto—gasp!—actual roads. In the actual wind. You know, the conditions that we actual cyclists face every time we throw a leg over the top tube either side of trainer season. To help understand how SawTooth works, consider an aerodynamic NACA shape in the pristine wind tunnel conditions of zero-degrees yaw. When air resistance is perfectly head-on, drag only exists in a parallel plane with an object, so a teardrop NACA cross section reduces drag to its absolute minimum by reducing the wake. Turn the yaw angle upwards of 15 or 20 degrees, though, and a true NACA shape begins to experience drag from the side opposite crosswind pressure as well. This lateral drag is Zipp's "laminar bubble," and it's the phenomenon responsible for the violent instability that leaves us wrestling with our bikes on gusty days.
Though Zipp was one of the shape's early adopters, the industry is now replete with rounded, bullet-shaped rim designs that aim to lessen destabilizing drag from crosswind forces; however, if Zipp's numbers are any indication, the SawTooth nodes take that reduction to a whole new level by better controlling crosswinds as they detach from the rim's opposite face. While deep rims will always be more vulnerable to lateral forces than shallow box clinchers, the NSW rim shape and SawTooth Technology contribute to a ride that requires less correction in windy conditions, and the corrections themselves are more subtle and intuitive than with yesterday's NACA profiles.
The improvements in aerodynamics even extend to the wheel's graphics. The rims are finished with Zipp's ImPress graphical treatment, which involves directly printing the aesthetic embellishments onto the rim rather than applying decals. This leaves the SawTooth nodes of ABLC dimpling uninterrupted and unimpeded.
It's only appropriate that we end the way every good ride does: with the brakes. Rather than the impressive braking of Zipp's Showstopper brake tracks, which feature on other 808 models, these wheels are only interested in rotors. Disc brakes do something that rim-brake carbon can only dream of: surpass alloy in terms of modulation, responsiveness, and overall stopping power. Knowing you can depend on your brakes means you can carry more speed into corners, brake later, and not worry about locking your wheels up when an unexpected obstacle—an off-leash dog where a trailhead connects to a canyon road, the inevitable sudden motorist, rubble sloughed off of a canyon wall—materializes.
Though it's depth means it's obviously best suited as a road wheel, the 808 NSW is built well enough to handle some light gravel abuse. Toward that end, every NSW Disc Brake wheels ships with thru-axle conversion end caps for 12 or 15x100mm up front and 12x142mm in the back. The wheels also include standard quick-releases, so regardless of your gravel, 'cross, or road axle standards, you should be covered.
- A racing wheelset that puts aerodynamics and braking on par
- Updated aerodynamics only surpassed by disc wheels
- Disc brakes add confidence to braking in all conditions
- Tubeless construction increases comfort and supple feel
- Better flat prevention and easier recovery for when you do puncture
- Improved layup increases durability while shedding grams
- Includes quick-release skewers with fork thru-axle adapters
- When drag is the enemy, Zipp's wheels are your speed weaponry