In this article, I’ll guide you through a comparison between the Specialized Tarmac SL8 and Cervelo Soloist; both popular road bikes among cyclists.
I’ll walk through the Specialized Tarmac SL8 and Cervelo Soloist models lineup, their specifications, and retail pricing (USD). I’ll explain the carbon fiber technology used (Specialized FACT vs ), and unique frameset features for each bike.
The goal is to help you get a better understanding before you make your final purchasing decision.
| Specialized Tarmac SL8 | Cervelo Soloist | |
|---|---|---|
| Type of bike | All-rounder | All-rounder |
| Frame material | FACT 12r carbon FACT 10r carbon | Cervelo carbon |
| Frame sizes | 44, 49, 52, 54, 56, 58, 61 | 44, 48, 51, 54, 56, 58, 61 |
| Groupset | Shimano, SRAM (12-speed) | Shimano, SRAM (12-speed) |
| Brakes | Hydraulic disc | Hydraulic disc |
| Cabling | Internal | Internal |
| Price (USD) | $6,500 to $14,000 | $3,400 to $6,800 |
Specialized Tarmac SL8
The Specialized Tarmac SL8 is the latest, all-rounder race bike.
Now in its eighth iteration, hence SL8, the Specialized Tarmac improves on the features of the Tarmac SL7 that made it one of the best bikes in professional cycling and a leading bike brand among amateur cyclists.
According to Specialized, the Tarmac SL8 has a 33% improvement in stiffness-to-weight ratio compared to the Tarmac SL7. The most significant improvement is in aerodynamics; a larger head tube with a sharper nose cone. Specialized calls this the Speed Sniffer.
The S-Works version retains the same FACT 12r carbon, while the Specialized Pro and Expert versions use the FACT 10r carbon. The difference between the S-Works and Specialized versions lies in the carbon fiber grade, choice of groupset, wheels, and components. The S-Works versions come with the newly launched Roval Rapide Cockpit, a one-pice carbon handlebar.
A size 56 bike weighs 6.62 kg (14.6 lbs) with a Shimano Dura-Ace Di2 groupset, and 6.85 kg (15.1 lbs) with a SRAM Red AXS.
There are six models in the Specialized Tarmac SL8 lineup based on its groupset setup. All models are electronic shifting only. It’s also available in frameset only for S-Works and for Specialized versions.
| Model | Frame material | Groupset | Wheelset | Max. tire size | Retail price (USD) |
|---|---|---|---|---|---|
| S-Works Tarmac SL8 | FACT 12r carbon | Shimano Dura-Ace Di2 (R9200) | Roval Rapid CLX II (51mm front, 60mm rear) | 32mm | $14,000 |
| S-Works Tarmac SL8 | FACT 12r carbon | SRAM Red eTap AXS | Roval Rapid CLX II (51mm front, 51mm rear) | 32mm | $14,000 |
| Specialized Tarmac SL8 Pro | FACT 10r carbon | Shimano Ultegra Di2 (R8100) | Roval Rapid CL II (51mm front, 60mm rear) | 32mm | $8,500 |
| Specialized Tarmac SL8 Pro | FACT 10r carbon | SRAM Force eTap AXS | Roval Rapid CL II (51mm front, 60mm rear) | 32mm | $8,500 |
| Specialized Tarmac SL8 Expert | FACT 10r carbon | SRAM Rival eTap AXS | Roval C38 (38mm) | 32mm | $6,500 |
More reading : Specialized Tarmac SL8 vs SL7 - What's Changed?
Cervelo Soloist
Cervelo Soloist
| Name | Description |
|---|---|
| 34mm tire clearance | The 34mm tire clearance makes the Cervélo Soloist a versatile road bike, especially in fitting wider tires for rougher terrains. |
| BBRighT-47 bottom bracket | BBRighT-47, also known as T47A or BBCorrect is a relatively new BB standard and came to prominence when Trek used it in the Madone. The larger bearings increased stiffness while avoiding the common creaking and wear problems due to pool tolerance between frames and bearing cups. The design puts the non-driveside bearing inside the frame, and the driveside bearing outside. It uses T47 cups, which thread into the frame rather than being press-fit. |
Specialized vs Cervelo carbon fiber
Specialized FACT Carbon
Specialized FACT (Functional Advanced Composite Technology) is an advanced carbon fiber technology used in high-performance Specialized bicycles. It offers a lightweight yet strong frame construction with precise carbon layup, resulting in optimal strength-to-weight ratio and improved ride quality.
FACT carbon frames are engineered to efficiently transfer power, absorb road vibrations, and provide a comfortable riding experience. With continuous innovation and refinement, FACT Carbon demonstrates Specialized’s commitment to delivering top-notch performance and enhancing the overall cycling experience.
The carbon is available in three grades. The choice between FACT 12r, 11r, or 10r carbon depends on the bike model, your preferences, riding style, and budget.
- Specialized FACT 12r Carbon is the highest-grade carbon used by Specialized. Bikes (S-Works models) with frames made from FACT 12r carbon are the lightest and stiffest in the Specialized line-up. These frames are manufactured using the most advanced techniques and materials.
- Specialized FACT 11r Carbon used to be the highest-grade carbon until the S-Works Tarmac (SL5). Today, it’s the highest-grade carbon for the S-Works Roubaix.
- Specialized FACT 10r Carbon is two steps below 12r in the Specialized carbon hierarchy. While it doesn’t provide quite the same level of weight savings and stiffness as 12r, 10r frames are still very light and stiff, providing a high level of performance. FACT 10r carbon is used in all non S-Works models and is ideal for riders who want a balance of performance and value.
Cervelo Carbon
Cervelo doesn’t publicly release information about the types of carbon fiber used on their road bikes.
From my observation of the current Cervelo bikes lineups, there are at least two carbon fiber grades used.
- Highest grade. Cervelo R5 and S5 could be using the highest carbon fiber grade of all the models. These are pure race bikes used by the pros and would likely have the best carbon fiber available at Cervelo.
- Mid-grade. Cervelo Caledonia and Soloist could be using a mid-level carbon and heavier fiber grade of all the models. These are endurance bikes that prioritize comfort over stiffness. So it’s not a surprise to see a lower-grade carbon fiber being used here.
Frameset technologies and innovations
Specialized Tarmac SL8 and Cervelo Soloist framesets incorporate advanced technologies to enhance their bikes’ performance and ride characteristics.
Here’s an overview of the technologies used in each bike model.
Specialized Tarmac SL8
| Name | Description |
|---|---|
| FACT carbon | Functional Advanced Composite Technology (FACT). A carbon fiber construction method that balances lightweight, stiffness, and compliance in Specialized bike frames. Available in two carbon grades; FACT 12r and 10r. A higher number indicates a higher grade of carbon. S-Works models use the FACT 12r carbon and Specialized Pro and Expert models use the FACT 10r carbon. |
| Rider-First Engineered™ | Rider-First Engineered™ is a design philosophy used by Specialized that ensures every frame size delivers the same predictable and responsive ride characteristics. This concept was first introduced with the 2015 Tarmac, and the idea has been incorporated into all models since. Instead of simply scaling frame sizes, Specialized takes into account that riders of different sizes have different weights, which are distributed differently. This means that each frame size experiences different forces. Therefore, each frame size is engineered independently with different carbon layups and tube dimensions, ensuring the optimal balance of rigidity, weight, and responsiveness for each size. In short, no matter what the frame size is, the ride quality and performance remain consistently excellent. |
| Win Tunnel | Specialized utilizes advanced tools and technologies to pursue aerodynamic excellence, such as the Win Tunnel, FreeFoil Shape Library, Computational Fluid Dynamics (CFD), and Data Acquisition (DAQ) system. The goal is to optimize aerodynamic performance by conducting wind tunnel tests, developing new airfoil shapes, simulating fluid flow, and collecting real-world data to improve rider position and enhance overall performance. |
Cervelo Soloist
| Name | Description |
|---|---|
| 34mm tire clearance | The 34mm tire clearance makes the Cervélo Soloist a versatile road bike, especially in fitting wider tires for rougher terrains. |
| BBRighT-47 bottom bracket | BBRighT-47, also known as T47A or BBCorrect is a relatively new BB standard and came to prominence when Trek used it in the Madone. The larger bearings increased stiffness while avoiding the common creaking and wear problems due to pool tolerance between frames and bearing cups. The design puts the non-driveside bearing inside the frame, and the driveside bearing outside. It uses T47 cups, which thread into the frame rather than being press-fit. |
Where to buy
Specialized shops
- Specialized online shops. Argentina, Australia, Austria, Belgium, Brazil, Canada, Chile, China, Colombia, Czech Republic, Denmark, Finland, France, Germany, Italy, Japan, Luxembourg, Mexico, Netherlands, New Zealand, Poland, Portugal, Singapore, Slovakia, South Korea, Spain, Sweden, Switzerland, Taiwan, United Kingdom, United States
- Specialized retailers. Use this tool to find your nearest Specialized retailers.
Cervelo retailers
- Cervelo retailers. Use this tool to find your nearest Cervelo retailers.
Alex Lee is the founder and editor-at-large of Mr. Mamil. Coming from a professional engineering background, he breaks down technical cycling nuances into an easy-to-understand and digestible format here.
He has been riding road bikes actively for the past 12 years and started racing competitively in the senior category during the summer recently.