Wheelset Zipp 303 S

The affordable Zipp 303 S, the versatile aero all-rounders with 45 mm high hookless rims and a 23 mm rim width, for tubeless tyres from 28 mm to 50 mm wide.

Included

• Zipp 303 S front wheel, Disc Centerlock, end caps as selected
• Zipp 303 S rear wheel, Disc Centerlock, end caps and freehub body as selected

Zipp 303 S Disc Tubeless wheel technology:

• ETRTO: 622x23 / 28 inches / 700C
• Intended use: Gravel, Competition,
• Rim type: Carbon rim, tubeless ready, hookless
• Rim width 23 mm, outer width 27 mm, rim height 45 mm
• Suitable only for tubeless tyres from 28 mm width
• Number of spokes: 24 double-crossed
• High-precision Swiss hub bearings
• Stainless steel Sapim CX Sprint black
• Brake disc mount: Centerlock
• Zipp 77 Disc front wheel hub, 12x100 mm thru-axle mount, convertible to quick-release mount
• Zipp 176 Disc rear hub, 12x142 mm thru-axle, convertible to quick-release
• Freewheel body available as
  • HG11 freehub for Shimano 8-12-speed and Sram 8-10 PG road and gravel cassettes
  • SRAM XDR freehub for SRAM Road AXS 12-speed and SRAM MTB XG 11 + 12-speed cassettes
  • Campa ED freehub for Campagnolo 10-12-speed cassettes
• Weight: Front wheel 715 grams, rear wheel 815 grams, set 1530 grams, manufacturer’s specification
• Maximum recommended tyre pressure: 5 bar (73 psi)
• Recommended rider weight up to 125 kg

Zipp 303 S Series:

Tubeless for disc brakes offers today’s cyclists the versatility they demand and the speed they seek. Building on its major victories in the spring classics, these 303 wheels retain their ideal 45 mm rim height for all conditions – but feature a significantly wider rim width to improve the wheels’ qualities and performance in almost every measurable way. Road bikes today are far more versatile than ever before. The 3030 S offers a completely new rim profile and design to further enhance riders’ performance on this type of bike. These wheels are designed for tubeless use and disc brakes, and therefore allow the use of wider tyres with lower air pressure – even at racing speeds on and off tarmac. The 303 S is one of our lightest wheelsets and is optimised for the best aerodynamics with 28 mm tyres. However, it also handles wide gravel tyres up to 50 mm. The 303 S utilises design elements from the higher-end 303 Firecrest Tubeless for disc brakes, making it more efficient and therefore faster on the road. This is achieved by reducing the following factors: air resistance, rolling resistance, fatigue and weight. The innovation responsible for this is the design of the 303 S series rim. The profile is 45 mm high, just like its predecessor, the 302 for disc brakes. The new rim is 2 mm wider on the outside, at 27 mm, and the rim bed is a full 7 mm wider at 23 mm. The rim platform is fastest with 28 mm tyres. Thanks to its width, the rim optimises the tyre shape, allowing for lower air pressure. This helps to reduce rolling resistance and makes riding more comfortable. The result of all this is a power saving of 10 watts compared to top-of-the-range wheels from the competition at 40 km/h on a flat road with 28 mm tyres, as internal tests at Zipp have shown. These groundbreaking wheels also come with brand-new designs that really stand out from the peloton – and at an attractive price too.

Zipp 303 S Tubeless hookless rim:

The 303 rim design delivers measurably higher speeds by allowing for lower tyre pressure than previous wheelsets. A rider travelling at 32 km/h on 40 mm-wide gravel tyres saves around 8 watts at 28 psi (1.9 bar) compared to a conventional gravel wheel with 40 mm-wide tyres and 36 psi (2.5 bar)

The taller and wider rim design of the 303 XPLR S delivers better aerodynamics. At an average race speed (approx. 29–36 km/h), our internal tests at Zipp showed an energy saving of 2 watts due to improved aerodynamics compared to a competitor’s wheel. The advantage increased to 10 watts or more when speeds exceeded 53 km/h on descents and other fast sections.

The hookless tubeless rims are only suitable for use with tubeless tyres

Zipp’s patented ABLC rim profile, Aerodynamic Boundary Layer Control, reduces drag even when the wind strikes the rim at an acute angle rather than head-on. The effective usable angle range here is significantly greater than with comparable rims. This is achieved through a special effect, similar to that seen on a golf ball. This is why Zipp wheelsets feature numerous small indentations on the rim surface. In addition, Zipp utilises VCLC technology – Visco-Elastic Constrained Layer Control – whereby highly shock-absorbing, visco-elastic materials are incorporated into the carbon matrix. ZIPP’s Carbon Bridge technology uses Kevlar fibres woven into the edge area of the carbon matrix to increase impact resistance. The deep sidewalls further dampen vibrations. External spoke nipples also ensure easier maintenance without any aerodynamic disadvantage.

Zipp TOTAL SYSTEM EFFICIENCY:

The new 303 Firecrest is the first wheelset designed to achieve Total System Efficiency (TSE). Based on the simple premise that efficiency equals speed, TSE is our solution for speed in the real world... a world of imperfect roads and changing riding conditions. Riding faster on or off-road means efficiency – more speed with less effort. The combination of a wider, tubeless tyre, lower tyre pressure, a wider rim profile optimised for the tyre interface, and a new rim laminate ensures more efficient riding performance. When applied to bicycles, efficiency means less effort is required to overcome air resistance, gravity, rolling resistance and vibration losses

Zipp 76/176 Disc Centerlock Hubs:

This hub set features a freehub body system with 36 engagement points and high-quality seals. Zipp hubs are designed for use with J-bend spokes, currently the most popular type of spoke. J-bend spokes are widely available and easier to replace.

Compatible endstops:

• Front wheel 9x100mm quick-release mount, item no. 11.2018.045.000
• Rear wheel 10x135mm quick-release mount, item no. 11.2018.045.010

Compatible freehub bodies for Zipp 177, 176 and 176 Disc hubs:

• HG11 freehub body Part No. 11.2018.061.000
• SRAM XDR freehub body Part No. 11.2018.062.000
• Campagnolo ED freehub body Part No. 11.2018.061.001

Zipp spokes:

Front and rear wheels with 24 Sapim CX Sprint stainless steel J-bend aero spokes.

Important note:

• Zipp rimless rims are NOT compatible with tyres that require a minimum pressure of more than 5 bar (73 psi). Please adhere to the minimum air pressure recommended by the tyre manufacturer, which is indicated on your tyre. Zipp rimless wheel and tyre systems should never be inflated to more than 5 bar (73 psi).
• Provided they are fitted with tubeless beads, wider gravel tyres ridden at lower pressures can generally also be used on rimless rims. If in doubt, you should contact the tyre manufacturer.
• Zipp’s tubeless rims are only suitable for tubeless tyres. Inner tubes are fine, but the tyre must have tubeless beads to ensure a secure fit.
• Zipp wheelsets with rimless rims meet existing industry standards for the dimensions that control the tyre fit. Ultimately, the tyre manufacturer determines the compatibility of its tyre with these standards. Zipp actively collaborates with tyre manufacturers on the ISO and ETRTO committees to develop uniform international standards for tubeless road bike tyres.
• Therefore, any tubeless tyre that meets these international standards should be compatible. However, tyre brands have the right to determine which products are compatible with clincher-free rims and which are not.
• If you are interested in a tyre that is not listed here, you should check with the tyre manufacturer or visit their website to find out whether the tyre is compatible with Zipp wheels.
• Zipp’s tyre pressure guide will help you determine your ideal pressure. Consider a wider tyre width if the recommended pressure for your setup is too close to 73 psi / 5 bar.
• This table is updated regularly; please check back for updates.

Herstellerinformation: SRAM, 1000 West Fulton Market, Chicago, Illinois 60607, USA, https://sram.com | EU Contact: SRAM, Paasbosweg 16, 3862 ZS Nijkerk, Netherlands, https://sram.com