Following the success of the Zipp 808 NSW, which wheel and accessories specialist Zipp Speed Weaponry notes was ridden to victory at the pro men’s IRONMAN World Championships and the Elite Women’s UCI Team Time Trial World Championships, Zipp is launching its second component in the NSW series – the Zipp 404 NSW Carbon Clincher.
Zipp’s advanced development engineers in the company’s top-secret lab, known as The Nest, have delivered a wheelset with ‘improved braking performance, exceptional aerodynamic efficiency, and unparalleled crosswind stability for [the brand’s] most popular and best-selling rim depth.’
Like the 808 NSW, the 404 NSW also makes use of Zipp’s Cognition hubset for increased durability and low freehub drag.
“Zipp NSW is basically the most advanced development technology that Zipp has at the time,” said Michael Hall, Zipp Director of Advanced Development
The Zipp 404 NSW is engineered to make every ride faster. With a rim depth of 58mm, the 404 NSW is designed as a do-everything wheelset that is adept at climbing and maintaining speed on the flats; ‘a wheel strong enough to handle the Spring Classics, but light enough to inspire sprints out of corners.’
With its advanced aerodynamics, developed using 42 different CFD (Computational Fluid Dynamics) concept studies and weeks in the wind tunnel; the 404 NSW’s up to 34% reduction in crosswind side force provides stability for a rim of this depth and saves watts that would have been spent keeping the bike straight.
The same stability that makes the 404 NSW fast on the flats also provides confidence for high speed descents. When it comes time to slow for a corner, Zipp’s NSW exclusive Showstopper brake track ‘stands ready to deliver the best modulation and shortest stopping distances available, regardless of weather conditions or the length of the descent.’
Zipp adds that every time a conventional hubset starts to coast, friction within the freehub ratchet mechanism works like a drum brake to slow the rider down. With the Cognition hubset’s Axial Clutch technology, Zipp has reduced this drag by disengaging the ratchet mechanism when coasting.
With less internal hub drag a rider can pedal less when drafting in a headwind, achieve higher speeds when coasting in an aero tuck, or opt to stop pedalling a moment sooner before entering a corner and bank that wattage for use exiting the corner.
According to Zipp, Axial Clutch technology allows riders also to maintain speed through corners that don’t require braking input, thereby increasing corner exit speeds.
Inside the Axial Clutch mechanism Zipp use magnets, rather than steel springs, to move and engage the light weight Metal injection Molded (MIM) ratchet rings for reliability and consistent operation. With 36 points of engagement that all interlock simultaneously, Zipp adds that there isn’t a more secure freehub mechanism on the market.
Zipp’s Axial Clutch freehub mechanism is also compatible with XD drivers. This gives riders the option to select a 10-42 cassette to assemble a 1×11 drivetrain with an equivalent range to either a compact or standard road double drivetrain.
A star-flanged straight-pull hubshell design on the rear hub distributes the load placed on the hub flange away from the bearings. Zipp has also developed a unique scalloped edge hubshell design for the front hub. This scalloped design maintains the bearing bore diameter when high radial spoke tension is applied.
According to the company, both of these hubshell design elements ensure that bearings quietly stay in place, roll faster, last longer, and provide a laterally stiffer hub… ‘About those bearings, we’ve chosen Swiss stainless steel bearings specially made to our specs to provide the longest lasting, lowest friction performance available.’
Zipp aims to ImPress
The company has employed its ImPress graphics technology, which prints graphics directly on the rim, to help allow the dimples to do what they were designed to do – control vortex shedding, the rate at which air sheds off the wheel.
Managing this is crucial to stability. As the company points out, like the 808 NSW, ImPress graphics also give the 404 NSW a distinctive stealthy look while keeping the rim as light as possible.
Zipp 404 NSW rims are laid up, moulded, drilled, and built in Indianapolis by Zipp technicians. The company’s wheel builders then hand lace the rims to the European-made Cognition hubset using Belgian Sapim CX-Ray spokes and Secure-Lock nipples to ensure precision alignment and even spoke tension. ‘The end result is a handcrafted wheelset that stays fast and true for years to come.’
Zipp 404 NSW Carbon Clincher
• 1555g wheelset total
• 705g front weight
• 850g rear weight
• 58mm wheel depth
• 27.8mm max width
• 26.44mm brake track width
• 18 front spoke count
• 24 rear spoke count
• Sapim secure-lock nipples
• Sapim CX-Ray spokes
• Cognition hubset
• ImPress graphics
Front: US$1,350, €1,200, £950
Rear: US$1,750, €1,600, £1200
Retail availability: February 2016
Each wheel includes:
• Zipp Tangente titanium black skewer
• Zipp valve extender by Silca
• Zipp individual wheel bag
• Zipp Tangente Platinum Pro Evo brake pads
• Zipp Tangente tube 700c x 20-28mm
• Zipp rim tape 700c x 20mm