Cervelo used the by-line “Simply Faster” for years. However, as time has passed, the top aero bikes have become so fast that the ante has been upped. Today, you need to be more than simply faster to compete at the top level. While gaining some mechanical complexity over its predecessor, the 2019 Cervelo S5 encapsulates the concept of “Beyond Fast” quite well. Read on to learn more about what makes the 2019 Cervelo S5 “new”.
Innovative change happens quickly on pro peloton capable aero road bike models. Seconds count and aerodynamics and stiffness tend to trump all. With this in mind, Cervelo fully integrated the front-end of the new S5. The bike boasts a new Cervelo AB08 carbon aero drop bar mated to a Cervelo CS28 V-Stem. This set-up has similarities to what is found on the 2018 P5 TT bike, but with much needed serviceability improvements. A new “bayonet style” front fork holds everything together and connects to the front wheel via a low profile thru axle. Yes. The 2019 S5 is only available with disc brakes.
Cervelo attributes the majority of the aerodynamic improvement from the previous S5 to the 2019 model to this integrated front-end, with cable concealment being a major player.
The addition of disc brakes (and associated thru axles) in combination with the new fork and carbon layup has further increased lateral stiffness of the 2019 S5 chassis by double digit percentages over the 2018 model. Thankfully, most of Cervelo’s increase in lateral stiffness happened at the axles and the headtube. While some companies have pursued bottom bracket stiffness at all costs, we don’t think that is always a great approach. Riding a bike is a rhythmic activity and you want a good dance partner. Doing the salsa with a “rigid as a steel I-beam” partner isn’t much fun… Cervelo has created a good balance in this regard by maximizing stiffness in the right places and not going too far elsewhere.
When it comes to vibration damping, Cervelo has made changes in frame layup of the carbon to enhance ride quality. They have increased tire capacity to easily accept a full 28mm width tire (a 30mm tire on many rims will fit without issue); wider tires allow smoother (and often lower rolling resistance) tires to be run and give the 2019 Cervelo S5 greater versatility.
Tire width makes a big difference when it comes to how smooth a bike feels and this combination enhances the ride of the 2019 S5.
Pro level aero road bikes are not known for their mechanical simplicity.
While many of the latest crop of aero superbikes are better than past generations, fully concealed cabling is inherently more complicated. The new integrated front-end of the S5 uses an improved version of the system developed on the 2018 and earlier P5. While the spacers are improved and easier to change, there is limited room for height adjustment without cutting or extending the cable housing accordingly. If you are a “set it and forget it” rider with a pretty static position, this isn’t an issue. However, if you need to adjust your fit by 2cm or more, get ready for stem and handlebar position changes to take some time (and cost some money). This is another reason why your bike should be built to match your riding position at purchase.
It should be noted that while the S5’s front-end has P5 similarities, from everything we have seen, travel accommodations with the new S5 are a marked improvement.
Cervelo S5 Aerodynamics
It is hard to find a cable showing on the 2019 Cervelo S5. When it comes to aerodynamics, it is hard to deny that covering everything with a deep and narrow tube helps. Cervelo has embraced this concept completely on the S5 Disc.
The 2019 Cervelo S5 will be at (or very close) to the top of every road bike on earth when it comes to minimizing CdA. While there are some road bikes claiming to have lower drag numbers than Cervelo, if you really dig into the data, you will find that they are not comparing apples to apples. The 2019 S5, thanks to the new integrated front-end, tests 43 grams lower drag (all else being equal) than the out-going model. That is a lot of drag to eliminate on a bike that is already near the head of its class aerodynamically.
We’re not going to split hairs analyzing aerodynamics between manufacturers. Whether a rider wins on a Specialized Venge, Trek Madone, Felt AR, Cervelo S or some other aero road bike is unlikely to come down to a few grams of drag between bikes. The rider is a huge factor in aerodynamics. You need all the top contenders under you in a controlled aero test environment (preferably field tested) to know whether one bike offers you lower drag than another.
Most of us don’t have the time or money to buy, set-up equally and field test the top five aero road bikes on the market in a controlled manner. So, do not buy the 2019 S5 because you think it offers a couple grams less drag than one of its competitors. This being said, if a 2019 Cervelo S5 fits you well and you buy one, rest assured that if you lose the field sprint it won’t be the bike’s fault; you would have lost by even more had you been on most other options.
Fit & Geometry
From a fit and geometry perspective, the 2019 Cervelo S5 remains Cervelo’s lowest and longest fitting bicycle. It takes a rider with a lower saddle height and longer reach morphology and/or possessing the strength, technique and posture that allows them to ride a “Pro Geometry” comfortably and efficiently to fit well on a 2019 Cervelo S5. The only way to not guess on this crucial aspect of buying a new bike is to get a Rider First Bike Fit and have a geometry search done to guarantee that the bike fits you before you buy.
2019 Cervelo S5 Handling
We really like how Cervelo is approaching handling on the 2019 S5. The bottom bracket is a few mm lower than past Cervelo S bikes (lower center of gravity), which is a good move. More importantly, Cervelo has taken great expense to keep the trail numbers virtually equal across the range of sizes by producing specific fork rakes for each frame size and associated head tube angle. There is no way that this approach, when combined with the lateral stiffness numbers we’ve seen, won’t result in one of the most confidence inspiring handling and stability packages found in a race bike today. As an added bonus, this statement won’t be size dependent as it is likely is with some other brands/models.
We almost forgot to talk more about one of the notable visual changes from the 2018 S5 – the brakes. The 2019 S5 is only available with disc brakes. Every year we see more bike models head to disc and aero testing is indicating that disc brakes often test even better than caliper. A good disc brake is certainly stronger and more progressive than a caliper brake. This is appreciated when descending on a bike this aerodynamic and confidence inspiring.
Regardless of your opinion on disc brake versus caliper brakes, the industry has made it clear that most bikes will have disc brakes in the future. Cervelo put the right type of brake on the 2019 S5.
2019 Cervelo S5 Disc Conclusions
Our in house testing staff has raced on previous generation S5 bikes for years. They always tested at or near the top of their class in all the crucial performance departments and the associated results proved that the bike was fast. Read Cervelo’s white paper on the S5 to learn more about the details.
However, the S5 has historically been (fairly) criticized at times as rewarding pure performance over ride experience. The 2019 S5 squarely takes on this criticism. Especially with the wider tire capacity, the 2019 S5’s ride quality is arguably within striking distance of the venerable R series bikes from Cervelo.
The 2019 S5 should prove to be one of the very best handling dedicated race bikes on the market. The aero improvements alone will surely keep it a “benchmark bike” that others are compared. There are other fast aero road bikes available on the market. However, Cervelo pretty much invented the aero road bike category and they haven’t stopped innovating since. In other words, if it fits you well and you want to go as fast as possible, the Cervelo S5 is one of the top few bikes in the world. The biggest difference will come in the fit and set-up done by the shop, so select your bike fitter and technician carefully to make sure they understand biomechanics and aerodynamic details.
Contact us with questions or to scheduled a fitting to see if a Cervelo S bike is a good match for you.