Zipp 303 Firecrest® 650B Carbon Clincher Tubeless Disc 6-bolt Wheel

It comes alive when the road ends: the 303 Firecrest® 650B Tubeless Disc Wheel by Zipp

The sport of cycling continues to develop and now includes both road racing and gravel. At the same time, bicycle manufacturers have to meet the requirements of users with shorter body height. These two aspects were key considerations in the development of the Zipp 303 Firecrest® 650B Carbon Clincher Tubeless Disc wheel.
The 303 Firecrest 650B goes beyond where the asphalt road ends. The smaller rim size allows more space in the frame and fork, allowing wider tyres to be mounted with all their advantages: comfort, puncture resistance and cornering performance. These wider tyres also ensure that the overall diameter (i.e. wheel including tyre) is similar to that of a standard combination of a 700c wheel and narrow racing tyre.
On asphalt, the 303 Firecrest 650B is ideal for shorter cyclists who prefer smaller frames. These athletes no longer need to use 700c standard wheels and can finally benefit from the better handling.
With the launch of the 650B, the Zipp 303 Firecrest is without limits, now more than ever.

Specifications:

Application:

Gravel, Cyclocross, Road

Wheel Size:

27.5" (650B)

Tyre Type:

clincher tyre

Number of Spokes:

24

Brake Type:

6-bolt disc

Tubeless System:

Tubeless Ready

Technical Information - Rim:

Type:

Zipp Firecrest Disc

Rim Flange:

with hook

Dimensions (ETRTO):

21-584

Inner Width:

21 mm

Outer Width:

28.9 mm

Depth:

45 mm

Valve Hole Diameter:

SV/Presta (6.5 mm)

Rim Material:

Carbon

Technical Information - Rear Hub:

Type:

Zipp 177D (Disc)

Over Locknut Dimension:

10 x 135 mm quick release, can be converted to 12 x 142 mm thru-axle

Bearings:

steel (61903)

Body Material:

aluminium

Freehub Body Material:

aluminium

Technical Information - Lacing:

Rear Lacing Pattern:

2-cross

Spoke Type:

Sapim CX-Ray / straight pull / straight

Spoke Size:

254 mm/252 mm (rear l/r)

Spoke Material:

stainless steel

Nipple Type:

Sapim secure-lock / external

Approved For:

Weight Limit:

113 kg total weight

Air Pressure (max.):

8.6 bar

Tyre Width (max.):

35 - 62 mm (according to ETRTO)

Features:

• 650B for use on gravel or ideal for riders on asphalt roads with a shorter body height
• reworked carbon fibre lay-up
• ABLC™ over the entire rim
• stiff and responsive
• the 45 mm rim depth is ideal for any terrain
• tubeless set-up possible (lower tyre pressure, better cornering performance, higher puncture resistance)

Technology:

Firecrest®
Through the pioneering use of software to analyse numerical fluid mechanics and the power of a supercomputer, Zipp is able to understand exactly what makes wheels go fast. Zipp then tests the most promising rim shapes in the wind tunnel and on the road. This process led to the creation of Firecrest rim technology, which allows the wheel's airflow and centre of gravity to be controlled more effectively, resulting in better aerodynamics, better handling in crosswinds and an overall better cycling experience.

ABLC™
The revised ABLC (Aerodynamic Boundary Layer Control) design reduces drag through more and smaller swirls to provide unsurpassed stability and handling even in the strongest winds.

Models:

27.5" rear 10x135 SRAM XDR:

Freehub:

SRAM XDR

Gearing:

11-/12-speed

Note:

A 1.8 mm spacer is required to mount XD cassettes on an XDR freehub.

Manufacturer Number:

00.1918.358.010

Only available to European & Russian customers.

Contents:

• 1 x Zipp 303 Firecrest 650B Carbon Clincher Tubeless Disc wheel (rear)
• 1 x Zipp Tangente quick releases
• 1 x Zipp rear 12 x 142 mm conversion kit
• 1 x Zipp tubeless valves, pre-installed
• 1 x Zipp tubeless rim tape, pre-installed
• 1 x Zipp valve tool