Specialized Aethos 2 Expert Di2 Road Bike - Grey - Size 56

Weighing in with just 705g making up the frame, Specialized’s Aethos 2 is the lightest bike in its...

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The Specialized Aethos 2 Expert Di2 is designed for road cyclists seeking an exceptionally lightweight, responsive, and comfortable ride for endurance adventures. Its key benefit lies in its class-leading 705g frame, offering a refined fit and geometry for confident handling and enhanced comfort on long days. A potential caveat is that specifications are subject to change without notice.

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BrandSpecialized

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FAQs

What is the primary advantage of the Aethos 2's frame weight?

The 705g frame is the lightest in its class, making climbing significantly easier and contributing to overall faster acceleration and a more nimble feel.

Can I fit gravel tires on this bike?

The Aethos 2 clears tires up to 35mm, which can accommodate wider road tires, cyclocross tires, or light gravel tires, offering increased comfort and grip on varied surfaces.

How does the geometry enhance rider comfort?

The refined geometry includes an increased stack height (15mm), a longer wheelbase (7mm), and a slacker headtube angle (0.5°), all contributing to a more relaxed and stable riding position, reducing pressure on the hands, neck, and shoulders.

What type of riding is the Aethos 2 Expert Di2 best suited for?

It is best suited for performance road riding, endurance cycling, long-distance rides, and climbing due to its lightweight design and comfortable geometry.

What maintenance does the Shimano Ultegra Di2 drivetrain require?

The Di2 system requires minimal mechanical adjustment as it is electronically controlled. Basic maintenance includes keeping the chain clean and lubricated, and ensuring the system battery is charged.

Are the Roval C38 wheels tubeless-ready?

Yes, the Roval C38 wheels are designed for tubeless setups, offering benefits like lower tire pressure, improved comfort, and reduced risk of pinch flats.

What is 'Flow State Design'?

Flow State Design refers to the unique, sculpted forms of the frame's tubes, which are precisely tuned to optimize energy flow through the structure, contributing to both performance and aesthetics.

How often should I check the bike's components?

It's recommended to perform a visual inspection and check tire pressure before every ride. A more thorough check of bolt tightness and component wear should be done periodically, with professional servicing recommended at least annually.

Troubleshooting

Di2 system not shifting correctly

Ensure the Di2 battery is charged. Check all junction box and wire connections. Consult Shimano's Di2 troubleshooting guide or a qualified mechanic.

Brakes feel weak or noisy

Inspect brake pads for wear and contamination. Clean rotors with isopropyl alcohol. Ensure the brake rotors are true and the hydraulic system has no air bubbles. Consult a mechanic if issues persist.

Frame makes creaking noises

Identify the source of the creak, which could be the bottom bracket, seatpost, or headset. Re-grease or re-torque relevant components. Consult a mechanic if the source cannot be found.

Uneven tire wear or flats

Check tire pressure regularly. Inspect tires for embedded debris. Ensure wheels are true and properly seated. Consider using tire sealant for added puncture protection.

Pros and Cons

Pros

  • Extremely lightweight frame for superior climbing and acceleration.
  • Comfortable geometry ideal for long-distance endurance rides.
  • Responsive and confident handling, especially on descents.
  • Reliable and smooth shifting from the Shimano Ultegra Di2 drivetrain.
  • Versatile with clearance for up to 35mm tires, enhancing comfort and grip.

Cons

  • Specifications are subject to change without notice.
  • Premium components may require specialized maintenance.
  • The focus on lightweight construction might make it less durable for aggressive off-road use.
  • Integrated components can make customization or repairs more complex.

Setup, Compatibility & Care

Initial Setup:

  1. Assembly: While the bike is largely assembled, professional bike shop assembly is recommended for critical components like the headset, bottom bracket, and drivetrain, especially for Di2 systems.
  2. Di2 System Setup: Follow Shimano's instructions for pairing derailleurs and shifters, and setting up custom button functions. Ensure the internal battery is fully charged.
  3. Tire Inflation: Inflate tires to the recommended pressure based on tire width, rider weight, and road conditions. For 35mm tires, pressures can typically be run lower for increased comfort and grip.

Compatibility:

  • Drivetrain: Designed for Shimano 11-speed Di2 components.
  • Brakes: Compatible with standard road disc brakes.
  • Wheels: Compatible with standard disc brake wheelsets; Roval C38 wheels are included.
  • Tires: Clears tires up to 35mm width.
  • Seatpost/Saddle: Compatible with standard seatpost clamps and saddle rail types.

Care and Maintenance:

  • Cleaning: Clean the frame and components regularly with mild soap and water. Avoid high-pressure washers, especially near bearings.
  • Drivetrain Maintenance: Keep the chain clean and lubricated. The Shimano Ultegra Di2 system requires minimal adjustment but should be checked periodically for wear.
  • Brake Care: Inspect brake pads and rotors regularly for wear and contamination. Clean rotors with isopropyl alcohol.
  • Storage: Store the bike in a dry place, away from direct sunlight and extreme temperatures.
  • Regular Checks: Periodically check tire pressure, bolt tightness (especially stem and handlebar bolts), and the overall condition of the components.