Zipp 303 Firecrest wheel

The Zipp 303 Firecrest, the super-light road, endurance and gravel front wheels weighing just 613 grams, featuring ZR1 hubs, 40 mm high hookless aero rims and a 25 mm rim width, approved for tyres from 30 mm width

Included

• Zipp 303 Firecrest front wheel, Disc Centerlock, end stops for 12x100 mm thru-axle assembly

Zipp 303 Firecrest Disc Tubeless wheel technology and dimensions:

• ETRTO: 622x25 / 28 inches / 700C
• Intended use: Gravel, Competition,
• Rim type: Carbon rim, tubeless ready, hookless
• Rim width 25 mm, outer width 28 mm, rim height 40 mm
• Suitable only for tyres 30 mm wide and above
• Number of spokes: 24 double-crossed
• High-precision Swiss stainless steel hub bearings
• Stainless steel Sapim CX Sprint black
• Brake disc mount: Centerlock
• Zipp ZR1 Disc front hub, 12x100 mm thru-axle mount, convertible to quick-release mount
• Weight: 613 grams (manufacturer’s specification)
• Maximum recommended tyre pressure: 5 bar (73 psi)
• Recommended rider weight up to 125 kg

The Zipp 303 Firecrest wheelset

Zipp’s 303 Firecrest tubeless wheelset for disc brakes is built for the real world – for less-than-perfect conditions, rough roads and adverse weather. A world where it’s clear: efficiency equals speed. It’s lighter, faster and better suited to a wide range of terrain – whether it’s smooth or crumbling tarmac or wild trails. Deeply rooted in Zipp’s long-standing dream of winning the spring classics, this new 303 Firecrest has also been redesigned – and adapted to the realities of today’s road bikes. When it comes to being fast on a bike, efficiency always means reduction – in aerodynamic drag and rolling resistance, in rider fatigue and in weight. The 303 Firecrest Tubeless wheels for disc brakes were designed under real-world conditions, not just in the wind tunnel or on a computer. The result is spectacular. At the heart of the wheels are durable, versatile new hubs, the ZR1 DB, developed in Germany.

Zipp 303 Firecrest Tubeless hookless rim:

The 303 Firecrest rim is slightly more curved than its predecessor and now has an outer diameter of 30 mm, a rim width of 25 mm and a height of 40 mm. The shape reduces air resistance and creates a smoother transition between the rim and the tyre, giving aerodynamic efficiency a real boost. The wide rim profile also ensures a more stable fit for the tyre, which further reduces rolling resistance. The combination of a wider tyre, greater volume and lower air pressure helps riders save energy immensely. The tyre and the wheel absorb the vibrations, not the rider.

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

Zipp ABLC Sawtooth rim profile:

The redesigned ABLC Sawtooth dimple design consists of 12 branching points that are synchronised in the rotating wheel. From a frequency of 50 Hz, which corresponds to a speed of 32 km/h, the dimples can demonstrate their aerodynamic advantages and help you achieve greater speed. However, the dimples not only reduce air resistance, they also ensure greater crosswind stability, particularly at higher angles of attack. Aerodynamic Boundary Layer Control reduces air resistance 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. For this reason, Zipp wheels feature numerous small dimples on the rim surface. Additionally, ZIPP utilises VCLC technology – Visco-Elastic Constrained Layer Control – in which 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 TSE

The Zipp XPLR Gravel wheels were developed using the Total System Efficiency approach. The development goal was to find the best possible wheel design to overcome the speed barriers encountered under realistic riding conditions. These include not only wind resistance, gravity and rolling resistance, but also vibration losses on poor road surfaces.

Zipp ZR1 Disc Centerlock Hubs:

The ZR1 DB hubset, developed in Germany, features an improved seal design and faster response thanks to the freehub body’s 66 engagement points. This hubset features an improved seal design and faster response thanks to the freehub body’s 66 engagement points. Our engineers spent more than two years developing the ZR1. Proving the hubset’s durability involved more than 58,500 km of test riding, which formed part of 3,222 hours of testing. It incorporates key technologies from the Zipp Cognition hubs. The seal design is based on Cognition, with a larger dust cap behind the freehub body and improved seals for greater protection. The bearing size is also the same as on the Cognition, although the Cognition uses premium bearings. The six pawls are staggered to operate in two groups of three. Three pawls are always engaged at any given time. This design creates a quick engagement feel with 66 engagement points. The freehub body is designed so that the pawls remain in place during disassembly to simplify maintenance. Zipp hubs are designed for use with J-bend spokes, the most popular type of spoke today.

Compatible end caps:

• Front wheel 9x100mm quick-release Mounting Type No. 11.2018.064.004

Zipp spokes:

Front and rear wheels with 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