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Zipp 303 NSW Carbon Clincher Tubeless Rim Brake 18/24 Spoke Road Wheel 2019

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Product Description

Road cycling is evolving, so we keep innovating. The pursuit of AeroBalance™ defines Zipp’s approach to wheel design. Combining low drag performance with stable handling is our mission, because speed without control, is useless. Zipp’s NSW Series, since its inception in 2015, has been the launching pad for Zipp’s most relevant innovations. To that end, the Zipp 303 NSW Carbon Clincher features an entirely redesigned rim shape that aerodynamically integrates wider tubeless tires for enhanced ride quality and performance.

The 303 NSW Carbon Clincher Tubeless features a wider 19mm internal rim width and corresponding outer rim shape for aerodynamic optimization with 25mm tires. This wheelset allows you to run tubeless or traditional clinchers. The benefits of tubeless include superior flat protection, the ability to run lower pressures, and a smoother ride with high cornering grip and low rolling resistance.
Like its siblings -- the 404, and 808 NSW Carbon Clinchers Tubeless --our top engineers in Indy incorporated tubeless compatibility optimized for 25mm tires with aero efficiency, industry leading braking performance, and reduced rolling friction to produce something special. Light enough to fly up climbs, tough enough to excel in the cobbled classics, and with the industry's best available braking performance for the most technical descents, the 45mm deep 303 NSW is built for a singular purpose: To be fast, everywhere.

But the 303 NSW is no 'race day only' wheelset to be tucked away in a wheel bag until a race number is pinned to the rider's jersey. It's built to take the abuse of everyday training rides. Zipp has achieved this reliability at a lighter weight with a revised carbon fiber layup developed through testing on the famed cobbles of the Forest of Arenberg with the world's fastest riders.
Because the toughest roads often experience the toughest weather conditions, we've included Zipp's Showstopper™ brake track for braking performance that delivers the best modulation and shortest stopping distances in wet and dry conditions. And we've improved aerodynamics with our ABLC Sawtooth™ technology and Impress™ graphics to produce a rim that is as fast as it is stealthy.

At the center of the 303 NSW wheelset is our Cognition hubset. Built to provide the lowest rolling friction possible without compromising sealing, the hub's Swiss-made bearings work in tandem with our Axial Clutch™ technology to dramatically cut rolling friction when compared with conventional freehub systems. Bottom line: Cognition hubs make the 303 NSW fast, even when you aren't pedaling.
All of these technologies combine to build a wheelset that only NSW can produce, a wheelset with unrivaled performance. Wherever the road may take you, get there faster on Zipp 303 NSW wheels.

Cognition™ Hubset:
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, we've reduced this drag by disengaging the ratchet mechanism when coasting. Our testing shows that the best traditional three-pawl hub designs have twice the rotating friction as our Axial Clutch equipped Cognition rear hub, and the most popular hubsets using a similar drive mechanism as Axial Clutch were found to produce four times the rotating friction.

With less internal hub drag a rider can pedal less when riding through rolling hills or drafting in a headwind. Or achieve higher speeds when coasting in an aero tuck, or opt to stop pedaling a moment sooner before entering a corner and bank that wattage for use exiting the corner. Axial Clutch technology also allows riders to maintain speed through corners that don't require braking input, thereby increasing corner exit speeds.
Inside the Axial Clutch mechanism we use magnets, rather than steel springs, to move and engage our light weight Metal injection Molded (MIM) ratchet rings for the most reliable and consistent operation possible. With 36 points of engagement that all interlock simultaneously, there isn't a more secure freehub mechanism on the market.
Our Axial Clutch freehub mechanism is also compatible with XDR drivers. This gives riders the option to select a 10-42 cassette to assemble a 1x11 drivetrain with an equivalent range to either a compact or standard road double drivetrain. In fact, for those looking for a wider gear range, or tackling especially extreme terrain, we now offer our Zipp NSW Carbon Clincher Tubeless wheels with a XDR driver body allowing for more cassette options including a 10-42.  

A star-flanged straight-pull hubshell design on the rear hub distributes the load placed on the hub angle away from the bearings. We’ve also developed a unique scalloped edge hubshell design for our front hub. This scalloped design maintains the bearing bore diameter when high radial spoke tension is applied. 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. Tires such as the Zipp Tangente RT25 Road Tubeless are a perfect match for this wheelset to deliver exceptionally low rolling resistance and high cornering grip. 

Key Features:
  • Tubeless
  • New, faster, more stable rim profile - AeroBalance™
  • Handcrafted in the USA
  • Entirely new 45mm rim profile, tubeless compatible for increased speed and better cornering, control and comfort
  • Cognition™ hubset with Axial Clutch™ technology provides reduced drag when coasting
  • ImPress™ graphics technology prints graphics directly onto the rim, for better air flow management, light weight and durability
  • ABLC Sawtooth dimple design helps manage air flow around the rim, and contributes to create a faster, more stable wheel
  • Industry leading Showstopper brake track: powerful and consistent braking, even on the wet.
Specifications:
  • Size (wheels): 700c
  • Rim construction: Carbon
  • Tire compatibility: Clincher Tubeless Ready
  • Brake compatibility: Rim
  • Rim - inside width: 19mm
  • Rim profile: Symmetrical
  • Rim finish: UD fibre, Impress technology
  • Colour (Decal): Impress
  • Nipple material: Aluminium
  • Spoke type: CX-Ray - Black
  • Spoke count: 18
  • Spoke pattern: Radial
  • Driver body type: n/a
  • Axle type (Wheels): QR 100 Caps (dia. 19mm)
  • Bearings: Cartridge - Stainless Steel

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Road Bike Wheel Guide

 
 

Road Bike Wheels

Whether you are upgrading or replacing, a new set of wheels is the best way to improve the performance of your road bike. Lighter wheels will enable you to accelerate quicker and climb faster, stiffer wheels will improve cornering stability while aero wheels reduce drag, so you can slice through the air faster.

With different types of road bike wheel available, not all road bike wheels will be compatible with your bike. In this road bike wheel guide, we will look at the different wheel options to help you choose the perfect new 700c wheelset for your bike.


Types of wheel

Traditional rim brake wheels

Wheels that are designed for rim brake are the traditional road bike wheels. These wheels are easily identified by the flat braking surface on the edge of the rim. This is usually a different colour and/or texture to the rest of the rim. Traditional rim brake wheels have a 100mm wide front hub and a 130mm wide rear hub. These wheels are all compatible with QR or quick release road bike axle skewers.

A race bike with traditional rim brake wheels

Disc brake wheels

Disc brake wheels don’t need a braking track, so the rim has a continuous profile. Instead disc brake wheels have special hubs that the discs are mounted on. There are two types of mounting for disc rotors: six bolt wheel hubs have, as the name suggests, six holes that the disc bolts into, centre lock hubs have a ridged spindle that the disc slots into. While the front hub is the same width on both disc and rim brake wheels, the rear hub is wider at 135mm or 142mm for thru axle wheels.

Two road bikes equipped with disc brakes and compatible wheels

Thru axles

While some disc brake wheels use traditional quick release skewers, many disc brake wheels use wider bolt-through (thru) axles. Thru axles improve the stiffness of the bike which is especially important for disc brakes as the braking forces are applied much closer to the axle. Thru axles on road bikes are usually 12mm in diameter with a rear hub width of 142mm. Quick release and thru axles are not compatible with each other, so it is important that you choose the correct type for your bike.


Clincher, tubeless and tubular

Most road bike wheels are clinchers. This means that the tyre grips the inside edge of the rim for a secure attachment when inflated. Traditional clinchers require an inner tube to stay inflated. Tubeless wheels are very similar to traditional clinchers but have an airtight seal over the spoke holes with a valve attached to the rim for inflating the tyre. Tubeless sealant is then added to the tyre to improve the airtight seal as well as automatically repairing punctures. Tubeless wheels can be used with regular inner tubes by simply removing the valve and sealant then fitting an inner tube. Tubular wheels are different and use special tyres that have an inner tube built in. These are the tyres that most pro riders use, but as the tyre is glued to the rim they are not practical for general cycling.

A road bike with clincher wheels

Free hub compatibility

The free hub is the part of the rear wheel that holds the cassette. There are two basic types on road bikes: HG (Hyper Glide) free hubs are the most common and are compatible with both Shimano and SRAM drivetrains, Capagnolo free hubs are only compatible with Campagnolo drivetrains. There are a couple of exceptions to this rule however: some gravel bikes, with one-by drivetrains, use mountain bike style XD cassettes, and some top-of-the range groupsets may also be different.

The free hub is the part of the rear wheel that holds the cassette.

Lightweight vs durability

Lightweight wheels are the best for climbing, but are still built strong enough for fast descending. Aero wheels, with deep section rims are a little heavier but slice through the air more efficiently so are best for rides that don’t have too many climbs. If you ride on rough surfaces then a more durable, endurance or cyclocross wheelset will give you a more confident feel and will last longer.

Lightweight wheels are best for climbing

Axles, rim tape and tubeless sealant

When you choose your new wheels, don't forget the extras you might need to go with them. If everything's compatible, you can of course re-use your existing QR skewers or bolt-through axles, but you might want to upgrade at the same time. Not all wheels come with rim tape to line the wheels with, so you might need to buy this as well. If you are upgrading to tubeless wheels, then you will need to buy tubeless sealant along with tubeless compatible tyres. Most tubeless wheels are supplied with valves and are ready taped.

Disc brake compatible wheel with thru axle

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