In this comparison, I’ll dissect two popular bike models; the Specialized Aethos vs Trek Emonda.
I’ll compare their lineups, bike specifications, and suggested retail prices in USD, then discuss the carbon fiber technology (Specialized FACT and Trek OCLV) and frameset technologies.
The goal is to give you a better understanding of Specialized Aethos and Trek Emonda to help in your decision-making.
| Type of bike | Specialized Aethos | Trek Emonda |
|---|---|---|
| Type of bike | Lightweight | Lightweight, all-rounder |
| Frame material | FACT 12r carbon FACT 10r carbon | OCLV 800 carbon OCLV 500 carbon |
| Frame sizes | 44, 49, 52, 54, 56, 58, 61 | 47, 50, 52, 54, 56, 58, 60, 62 |
| Groupset | Shimano, SRAM (12-speed) | Shimano, SRAM (12-speed) |
| Brakes | Hydraulic disc | Hydraulic disc |
| Price (USD) | $5,200 to $14,250 | $4,999 to $13,199 |
Specialized Aethos
The Specialized Aethos is a lightweight road bike designed for hardcore weight weenies. Featuring a more traditional shape with rounded tubes and non-dropped seat stay, the Aethos weighs only 5.9kg for a complete bike.
Pronounced as Ay-thoss, the naming is based on the Greek word Ethos, meaning character.
With its weight below the minimum of 6.8kg mandated by the UCI, the Specialized Aethos will not feature in professional cycling. Like the Tarmac, the S-Works frames use the FACT 12r carbon, and non S-Works frame use the FACT 10r carbon.
There are five models in the Aethos lineup based on its groupset setup. It’s also available in frameset only for Specialized and S-Works editions.
| Model | Frame material | Groupset | Wheelset | Retail price (USD) |
|---|---|---|---|---|
| S-Works Aethos | FACT 12r carbon | Shimano Dura-Ace Di2 (R9200) | Roval Alpinist CLX | $14,250 |
| S-Works Aethos | FACT 12r carbon | SRAM Red eTap AXS | Roval Alpinist CLX | $13,750 |
| Specialized Aethos Pro | FACT 10r carbon | SRAM Force eTap AXS | Roval Alpinist CL | $8,700 |
| Specialized Aethos Expert | FACT 10r carbon | Shimano Ultegra Di2 (R8100) | Roval C38 | $8,000 |
| Specialized Aethos Comp | FACT 10r carbon | SRAM Rival eTap AXS | DT Swiss R470 | $5,200 |
Specialized Aethos vs others
Trek Emonda
The Trek Emonda is a lightweight bike for the high mountains.
The lightest Trek Emonda frame weighs less than 700g using Trek’s OCLV 800 carbon. This is the bike Richie Porte rode to his third place in the 2020 Tour de France.
The SLR is the lightest and most expensive atop the Trek Emonda models. There are six Emonda SLR options, specced electronic shifting groupsets from SRAM or Shimano.
Next in line is the SL, the mid-range, more budget-friendly option. It has the same frame design and geometry as the SLR but uses the OCLV 500 carbon instead. The groupset choices are Shimano Ultegra Di2, Shimano 105 Di2, SRAM Force AXS, or SRAM Rival AXS.
The Trek Emonda SLR and SL framesets are also available separately.
| Model | Frame material | Groupset | Wheelset | Retail price (USD) |
|---|---|---|---|---|
| Trek Emonda SLR 9 AXS | OCLV 800 carbon | SRAM Red eTap AXS | Bontrager Aeolus RSL 37 | $13,199 |
| Trek Emonda SLR 9 | OCLV 800 carbon | Shimano Dura-Ace Di2 (R9200) | Bontrager Aeolus RSL 37 | $12,749 |
| Trek Emonda SLR 7 AXS | OCLV 800 carbon | SRAM Force eTap AXS | Bontrager Aeolus Pro 37 | $9,699 |
| Trek Emonda SLR 7 | OCLV 800 carbon | Shimano Ultegra Di2 (R8100) | Bontrager Aeolus Pro 37 | $8,999 |
| Trek Emonda SLR 6 AXS | OCLV 800 carbon | SRAM Rival eTap AXS | Bontrager Aeolus Pro 37 | $8,399 |
| Trek Emonda SLR 6 | OCLV 800 carbon | Shimano 105 Di2 (R7100) | Bontrager Aeolus Pro 37 | $7,699 |
| Trek Emonda SL 7 AXS | OCLV 500 carbon | SRAM Force eTap AXS | Bontrager Aeolus Pro 37 | $6,699 |
| Trek Emonda SL 6 | OCLV 500 carbon | Shimano 105 Di2 (R7100) | Bontrager Aeolus Elite 35 | $4,999 |
Trek Emonda vs others
Specialized vs Trek 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.
Trek OCLV carbon
The OCLV (Optimum Compaction, Low Void) carbon is a proprietary carbon fiber manufacturing technology developed by Trek.
- Optimum Compaction refers to the heat and pressure applied during the curing process to squeeze out excess resin and ensure that the carbon layers are compacted to the optimal density.
- Low Void refers to the goal of reducing microscopic air pockets or voids that can occur in the carbon fiber and create weaknesses.
One of the key advantages of OCLV carbon is its ability to achieve an optimal balance between stiffness, strength, and weight. Trek engineers carefully tune the carbon layup and utilize varying modulus carbon fibers to create stiff frames in certain areas to maximize power transfer while maintaining compliance in other areas to enhance comfort and ride quality.
The OCLV carbon is available in 800 and 500 series.
- OCLV 800 is the highest-grade carbon fiber used by Trek. The carbon modulus is higher in OCLV 800, making it stiffer and lighter. The manufacturing process is more refined, using more advanced carbon and resins, leading to a bike frame that provides top performance levels for stiffness, weight, and strength. OCLV 800 is used in all models with SLR.
- OCLV 500 is a lower-grade carbon but still offers a high level of performance. It has a slightly lower carbon modulus, meaning it’s a bit less stiff and heavier than OCLV 800. OCLV 800 is used in all models with SL.
It’s worth noting that the different OCLV grades don’t only refer to the material itself, but also to the manufacturing techniques used to form the carbon fiber into bike frames. Higher-grade carbon requires more precise manufacturing techniques to take full advantage of its superior material properties.
Frameset technologies and innovations
Specialized Aethos and Trek Emonda 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 Aethos
| 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. |
Trek Emonda
| Name | Description |
|---|---|
| OCLV Carbon | Optimum Compaction, Low Void (OCLV). A carbon fiber technology used in Trek frames. Employs advanced layup techniques and precise carbon compaction to create lightweight, strong frames with a balanced blend of stiffness and compliance. Available in two grades; OCLV 800 and 500. A higher number indicates a higher grade carbon. |
| H1.5 geometry | Trek’s geometry design that strikes a balance between aggressive racing positioning (H1) and rider comfort (H2). H1.5 geometry provides a slightly more relaxed riding position than the racier H1 geometry, making it suitable for a wider range of riders. |
| Project One | Trek’s customization program allows riders to create personalized and unique bikes. With Project One, riders can customize various aspects of their bikes, including frame color, paint scheme, components, drivetrain, wheels, and other details. |
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.
Trek shops
- Trek online shops. Australia, Austria, Canada, Germany, Netherlands, United Kingdom, United States
- Trek retailers. Use this tool to find your nearest Trek 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.