Zipp Wheels: Compatibility & Firecrest 404 Review

When investing in high-performance cycling components, understanding compatibility and performance is paramount. Zipp, a name synonymous with speed and innovation in the cycling world, consistently pushes the boundaries with their wheel designs. This article delves into a common question regarding Zipp wheels and caliper brake compatibility, before providing an exhaustive review of one of their most popular and recently updated offerings: the Zipp 404 Firecrest Carbon Tubeless Disc Brake wheelset.

Zipp Wheels and Caliper Brakes: A Fading Era?

One of the most frequent questions from cyclists concerns the compatibility of Zipp wheels with traditional caliper brakes. Historically, Zipp produced a wide range of carbon wheels designed specifically for caliper brake systems. Models like the older 404, 303, and 808 were mainstays for riders seeking aerodynamic advantages with rim brakes. However, the cycling industry has undergone a significant shift towards disc brake technology, particularly in the road bike sector.

Modern Zipp carbon wheelsets, especially those developed in recent years, are predominantly engineered for disc brakes. This transition is driven by the superior braking performance, consistency in all weather conditions, and improved modulation offered by disc brake systems. As a result, new Zipp wheel models, such as the latest iterations of the 303, 404, and 454 series, are designed exclusively for disc brake use. Their rim profiles are optimised for aerodynamics without the need for a braking surface, often featuring wider internal widths and hookless designs that are incompatible with the higher pressures and specific tyre interfaces required for rim brakes.

Therefore, if you own a bike with caliper brakes, you would need to look for older or discontinued Zipp models that were explicitly designed for rim brake use. Attempting to use a disc-specific Zipp wheelset with caliper brakes is not only impossible due to the lack of a braking surface but also unsafe. The structural integrity and design of disc-specific rims are not intended to withstand the heat and friction generated by rim braking. It's crucial to always check the manufacturer's specifications for compatibility before purchasing any wheelset.

Introducing the Zipp 404 Firecrest Carbon Tubeless Disc

Shifting focus to Zipp's current innovations, the Zipp 404 Firecrest Carbon Tubeless Disc Brake wheels represent a significant leap forward in performance and value. Long regarded as an 'all-round speed weapon', the 404 Firecrest, with its 58mm deep rims, is versatile enough for a broad spectrum of cycling disciplines, from demanding hilly road races to flat-out time trials and triathlons. The latest version has undergone a substantial transformation, shedding both weight and a significant portion of its price tag compared to its predecessor, making it a far more competitive option in the high-end wheel market.

The performance of these wheels is nothing short of excellent. They are remarkably quick and exhibit impressive lateral stiffness, contributing to a highly responsive ride feel. However, a key design choice – the implementation of hookless rims – introduces certain considerations, particularly regarding tyre compatibility. While this design has facilitated cost reduction and weight savings, it does, for the time being, narrow down the selection of compatible tyres.

The Weight Advantage: Shedding the Pounds

One of the most striking improvements in the new 404 Firecrest is its weight. Zipp claims a svelte 1,450g for the wheelset. Our real-world measurements, including tubeless tape and valves, came in slightly higher at 1,530g, but this remains exceptionally competitive for a wheelset of 58mm depth. To put this into perspective, many comparable deep-section wheelsets are considerably heavier. For instance, the Reynolds AR58/62 X DB wheelset tips the scales at 1,711g, making the Zipps a notably lighter option.

Even when compared to lighter alternatives like the Roval Rapide CLXs (1,410g), the 404s are not much heavier, despite the Rovals featuring a shallower front rim and foregoing tubeless compatibility to achieve their weight. This demonstrates Zipp's success in significantly reducing mass without compromising on depth or critical features, a testament to their engineering prowess.

Hookless Rims: Innovation or Limitation?

The move to hookless rims is a defining feature of the new 404 Firecrest, offering undeniable advantages. Firstly, the simplified manufacturing process of straight-sided rim walls directly translates into lower production costs, a benefit that Zipp has commendably passed on to the consumer, leading to the substantial price drop. Secondly, the design contributes significantly to the wheelset's impressive weight reduction.

Despite these benefits, the concept of hookless rims on road wheelsets, especially given the higher pressures typically used, still elicits some apprehension. Zipp addresses this by recommending a relatively low maximum tyre pressure of just 72psi for the 404s. This lower pressure recommendation does influence usable tyre widths, generally necessitating a 28mm tyre for optimal performance and safety, though some brands offer compatible 26mm options. For many modern cyclists who have embraced wider tyres for comfort and grip, this is less of a concern.

The primary 'limitation' of hookless rims currently lies in tyre compatibility. Not all tyre manufacturers approve their products for use with hookless rims, meaning cyclists might find their favourite brands or specific models are off-limits. While Zipp provides a relatively comprehensive compatibility list, it's essential to consult this list before purchasing tyres. This ensures safety and prevents issues like tyres blowing off the rim, a common fear, though one that, with correct tyre choice and pressure, appears largely unfounded based on real-world testing.

A significant positive of the hookless design is the enhanced tyre-to-rim interface. The 23mm internal-width rim creates an almost seamless transition with a 28mm tyre, which not only looks incredibly clean but also contributes positively to aerodynamics. This smooth integration helps the airflow transition more efficiently from the tyre onto the rim, reducing drag.

Tyre Fitting and Real-World Reliability

Fitting tyres to the 404 Firecrest rims is remarkably easy. Multiple tyre sets, including Goodyear Eagle F1s and Schwalbe Pro Ones, seated without the need for an air shot, often accompanied by a reassuring 'pop'. After several weeks of rigorous use, confidence in the hookless design grows, provided the correct tyres are used. The risk of tyres coming off during rapid deflation, while a concern, is not necessarily higher than with traditional clinchers, as this can occur with any tyre system under extreme circumstances.

On the Road: Performance and Handling

Beyond the technical specifications, how do the 404 Firecrest wheels perform in the real world? The outer rim shape is slightly more V-shaped than the U-shaped profiles that have become common, yet handling in crosswinds is surprisingly stable. Even when passing gateways or in gusty conditions, the wheels maintain composure, a critical factor for rider confidence, especially with deep-section rims.

Zipp's signature dimpled rim surface is more pronounced than ever. These dimples are not merely aesthetic; they are engineered to create a thin boundary layer of air that adheres to the rim surface as it moves, easing airflow separation and significantly reducing drag. This sophisticated aerodynamics technology contributes directly to the wheel's perceived speed.

The wheels are laced with 24 J-bend spokes (front and rear) and feature external spoke nipples, simplifying truing and maintenance. Their climbing prowess is excellent, partly due to the reduced weight, but more so owing to their exceptional lateral stiffness. During hard accelerations and sprints, there is no discernible flex, allowing every watt of power to be transferred efficiently to forward motion. They also produce that satisfying, deep carbon 'whoosh' sound when riding out of the saddle – a truly motivating acoustic.

Hubs and Bearings: The Heart of the Wheel

At the core of the rear wheel lies Zipp's new ZR1 DB hub. This hub provides near-instantaneous engagement, even at low speeds, significantly enhancing the 404s' overall feeling of responsiveness. With six pawls and 66 points of engagement, it boasts an engagement angle of just 5.45 degrees – a marked improvement over the 32-tooth ratchet system found in earlier models, which some riders found less ideal on rougher terrain.

The 404s are available with Shimano/SRAM or XDR 11-speed freehub bodies, with a Campagnolo freehub available separately. All freehubs are made from steel, which, while marginally heavier than aluminium, prioritises durability – a sensible choice for a long-lasting component. The ZR1 hubs also borrow bearing sizes from the premium Cognition freehub used in Zipp's top-tier NSW wheelset, though here they are steel rather than ceramic. While ceramic bearings offer marginal gains, the steel bearings are a key factor in the 404s' more accessible price point. Upgrading to ceramic bearings like those from Ceramicspeed is an option for those seeking every possible advantage.

A minor quality control issue was noted with the front wheel bearings being completely dry upon arrival, leading to squeaking at speed. While this might be an isolated incident that Zipp would readily address, it highlights the importance of checking new components. A simple application of lubricant rectified the issue, restoring the smooth, silent operation expected from a premium wheelset.

Value for Money: A Competitive Edge?

At £1,600, the new 404 Firecrest wheelset is certainly not cheap, but its value proposition has dramatically improved. The colossal £800 price drop from the previous generation makes it significantly more competitive. It's now £250 cheaper than the Roval Rapide CLX (£1,850), which, despite being lighter, lacks tubeless compatibility. The 404s also undercut the similarly deep Swiss Side Hadron2 Ultimate 625s (£1,920), while offering better handling in wind.

Here's a comparative look at some deep-section disc brake wheelsets:

While cheaper options like the Hunt 60 Limitless Aero Disc wheelset exist at £1,189, they typically come with a weight penalty (1,669g in this case). The 404s strike an impressive balance between performance, weight, and price, making them a very compelling choice in their category.

Maintaining Your Zipp Wheels

Proper maintenance is crucial for extending the life and ensuring the optimal performance of any high-end wheelset, including your Zipp 404s. Here are some general tips:

• Regular Cleaning: Keep your rims and braking surfaces (if caliper) or disc rotors (if disc) clean. For disc wheels, wipe down the rims to remove road grime, and clean disc rotors with a dedicated disc brake cleaner.
• Tyre Pressure Checks: Regularly check your tyre pressure before each ride. For hookless rims, adherence to the manufacturer's maximum pressure recommendations (e.g., 72psi for the 404s) is critical for safety and performance.
• Bearing Health: Listen for any unusual noises from your hubs. While the ZR1 hubs are robust, occasional inspection and re-greasing of bearings can prevent issues, as noted with the dry front wheel bearings. If you suspect an issue, consult a qualified bike mechanic.
• Spoke Tension: Periodically check spoke tension. Loose spokes can lead to a wheel going out of true or even wheel failure. External spoke nipples on the 404s make truing easier.
• Tubeless Sealant: If running tubeless, check and replenish your sealant every few months, or as recommended by the sealant manufacturer. Sealant can dry out over time, compromising its puncture-sealing capabilities.
• Axle Inspection: Ensure thru-axles are clean and lightly greased to prevent creaking and ensure smooth installation/removal.

Frequently Asked Questions (FAQs)

Q: Are the Zipp 404 Firecrest wheels compatible with my rim brake bike?

A: No, the Zipp 404 Firecrest Carbon Tubeless Disc Brake wheels are designed exclusively for disc brake systems and are not compatible with rim brakes.

Q: What tyres can I use with the hookless Zipp 404 Firecrest rims?

A: You must use tubeless-ready (TLR) tyres that are explicitly approved by the tyre manufacturer for use with hookless rims. Zipp provides a compatibility list, which you should consult before purchasing tyres. Generally, 28mm tyres are recommended, with some 26mm options available from specific brands.

Q: What is the maximum tyre pressure for the Zipp 404 Firecrest wheels?

A: The maximum recommended tyre pressure for the Zipp 404 Firecrest Carbon Tubeless Disc Brake wheels is 72psi (4.96 bar).

Q: Are the Zipp 404 Firecrest wheels good for climbing?

A: Despite their 58mm depth, the new 404 Firecrest wheels are surprisingly good for climbing due to their significant weight reduction (1,450g claimed) and excellent lateral stiffness, which ensures efficient power transfer.

Q: Can I upgrade the bearings in my Zipp 404 Firecrest hubs?

A: Yes, the steel bearings in the ZR1 hubs can be upgraded to ceramic bearings (e.g., Ceramicspeed 6903/61903) if you wish to minimise rolling resistance, though the performance difference in real-world conditions is marginal.

Q: What is the engagement angle of the ZR1 DB hub?

A: The ZR1 DB hub features a 5.45-degree engagement angle, thanks to its six pawls and 66 points of engagement, providing near-instantaneous power transfer.

Q: Do the Zipp 404 Firecrest wheels handle well in crosswinds?

A: Despite their 58mm depth and slightly V-shaped profile, the wheels handle surprisingly well in crosswinds. Zipp's dimpled rim design helps manage airflow effectively, contributing to stable handling.

Overall Verdict

The latest Zipp 404 Firecrest Carbon Tubeless Disc Brake wheels are seriously impressive. They represent a significant evolution, successfully convincing many of the tangible benefits of the hookless design, particularly the undeniable weight savings and substantial price drop. While current tyre choice might be somewhat limited, this is a developing area, and compatibility is expected to broaden as more tyre manufacturers embrace hookless technology.

Despite a minor initial quality control concern with the bearings, which was easily rectified, the overall performance of these wheels is stellar. Zipp claims a 4-watt saving at 40kph over the previous generation, and while empirical testing is challenging, the 404s certainly feel fast across all terrains. They are stiff and light enough to inspire confidence on climbs, aerodynamic enough for time trials, and handle with surprising composure given their 58mm depth. The new 404s truly excel as excellent all-rounders, offering a potent blend of speed, efficiency, and value for the modern disc brake-equipped bicycle, provided you're prepared to embrace the hookless future.

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