We tested the new Pirelli P Zero Race TLR SL-R: the fastest and most aerodynamic tire ever made by the brand

Pirelli has released a new top-of-the-line reference for road cycling, prioritizing aerodynamics. The P Zero Race TLR SL-R is positioned above the P Zero Race RS, which was previously the premium product of the Italian brand in the peloton, and is the tire used by riders like Mathieu van der Poel and Mads Pedersen. We have tested it, and here is our take on what will undoubtedly be one of the tires of the year.

We tested the P Zero Race TLR SL-R: technologies and sizes

We tested it in the 30 mm version, standard edition (there is also a Team Edition with yellow logos) and mounted it on Zipp carbon aero rims with a 22 mm internal width. Pirelli initially launched it in 28 and 30 mm, with the 32 mm version expected by the end of the year.

PAAS, LiteCORE, and SmartEVO²: the three pillars of the SL-R

Let's get into the three technologies that define this tire. All three are important, although the first is making the most noise.

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PAAS. The acronym stands for Pirelli Advanced Aerodynamic System. In other words, a patented tire profile that repositions the point where the tire is widest so that the air stays "attached" to the wheel+tire assembly for a longer time. The result, according to the brand, is an improved sail effect at wind angles of up to ±20°. 18 months of wind tunnel testing and CFD simulation to get here, they say from Pirelli.

What are the figures they communicate regarding the Race RS? 20% aerodynamic improvement in normal wind conditions, 10% less rolling resistance (about 2 W per set), and 15 g less weight in the 28 mm version. In high yaw peaks at 45 km/h, they talk about up to 15 W less drag compared to direct competitors. These are manufacturer data, so it's wise to take them with the usual caution.

LiteCORE. The lightest and most flexible Tubeless Ready casing in Pirelli's catalog. 120 TPI, a lot of lateral flexibility, and designed to combine low rolling resistance with good sensitivity on asphalt. In summary, making the tire feel alive.

SmartEVO². The compound. An evolution of the original SmartEVO with a new mixing process, now produced entirely at Pirelli's plant in Bollate (Milan). Three polymers, aimed at improving grip (especially in wet conditions) without compromising rolling performance.

A detail that is left out of focus but is worth mentioning: 21% of the tire's weight is certified natural rubber from FSC.

Sizes, mounting, and the actual section on modern rims:  Watch out for the mounted section: 30 mm that becomes 32-34 mm real

Before getting on the bike, a review of weights and measures. And here is an important detail to check before buying.

The official weight of the 30 mm is 295 g. On our scale, the tire weighed 308 g. Thirteen grams above the manufacturer's figure. It is within the usual tolerance for the segment, and it is a reasonable weight for an aero tire, but we are not talking about the lightest on the market. Pirelli here did not want to play the gross weight card: they prioritized grip, comfort, and aerodynamics.

Now, the figure that caught our attention the most: the actual section once mounted. The 30 mm, on a 22 mm internal rim, gave us 32.32 mm with a caliper. This is expected behavior, consistent with how the tire is designed (the PAAS technology itself assumes modern wide rims). But it is something to keep in mind: if your frame has little tolerance in the fork or stays, measure well before buying. Those coming from narrow wheels with narrow tires may be surprised.

The SL-R is homologated under ETRTO standards for internal rim widths between 22 and 25 mm. It is compatible with hookless as long as you respect the maximum pressures indicated by the brand.

The mounting is straightforward. It fits by hand without levers until the last section, where a little help is needed. Once on the rim, the bead seats with a push from a conventional floor pump, without a compressor. It holds pressure from day one, and the tubeless sealing has been clean, without that typical initial sweating of some premium models with thin casings.

On the road: heats up quickly and sticks to the asphalt

We have ridden it for several weeks and go straight to what matters. First, the rolling. Very smooth from day one, with no break-in period. That somewhat hard-to-describe feeling of tires that seem to "roll themselves" on flat terrain. It is not a surprising effect at this level, but the SL-R offers it with a clarity that has been immediate in our case.

Secondly, and here is what has caught our attention the most: it takes temperature very quickly. After the first 10-15 minutes of riding, especially on warm asphalt, the grip takes a noticeable leap. The bike literally sticks to the ground in fast corners, in abrupt transitions, and when braking hard before a turn, you feel how you "take control" of the bike immediately. It reminds us of the behavior of motorsport tires from the Pirelli group itself, where the optimal window needs a few minutes to open. When cold, it is not bad, but when it is at its point, you can feel it.

In wet conditions and on dirty asphalt, the SmartEVO² performs well. Note, we are not talking about a winter tire: it is a slick with microtexture. But the lateral grip in humid corners and the response to braking are predictable. For daily training in cities with gravel and glass, they are not recommended; there are more reasonable options within Pirelli's own catalog. Here, the priority is not durability or puncture resistance.

The comfort is what has surprised us the most in this test; the LiteCORE casing is clearly more flexible than that of the Race RS, and with the wide mounted section, the tire absorbs the typical patchwork of secondary roads and rough concrete sections very well. We have ridden between 4.8 and 5.2 bar for 30 mm with a cyclist weighing about 75 kg, and the feel has been softer than we expected from a tire marketed as aerodynamic and fast.

Regarding wear, after several weeks of intense use, the tread has evolved consistently with a race tire: visible but progressive, without bald spots or premature grooving. Some superficial cuts in gravel areas, but none that have compromised the tubeless sealing or stopped us.

A tire that justifies its price if the priority is maximum performance

In summary: the P Zero Race TLR SL-R is consistent with the current moment in the high-performance road segment, where aerodynamic work is moving from the frame and wheels to the tire itself. Pirelli offers a tire that combines the three basic pillars of a good modern race tire (rolling, grip, comfort) with aerodynamic work that is measured in data, not in brochures.

Who is it for? For those looking for an extra performance in races, time trials, or rides marked by average speed. For those who ride a lot on flat terrain and are interested in the watts they save from the air. For those who already come from the Race RS and want to feel another level up.

Who is it not for? For daily training on dirty roads or for long winters in areas with many punctures. There, the Race RS or the versions with more protection from the range make more sense.

The price announced by Pirelli is 99.90 € per unit in the standard version and 99.99 € in the Team Edition with yellow logos. Manufactured in Italy. Available now in 28 and 30 mm, with the 32 mm expected by the end of the year.

Technical specifications P Zero Race TLR SL-R

You can find more information about this and other tires on the official brand website.