If you’re considering Fizik’s Aeris range of triathlon and time trial saddles, you’ve probably seen two main options: LD and SD. Naturally, the big question is—what is the difference between Fizik Aeris LD and SD? Understanding this will help you choose the right model for your race distance, riding style, and comfort needs.
Fizik Aeris LD vs SD: The Core Difference
The LD (Long Distance) and SD (Short Distance) versions are designed for different racing demands:
- Aeris LD: Built for long-distance triathlons and Ironman events. It has a wider nose, deeper pressure-relief channel, and more supportive padding to keep you comfortable over hours of racing.
- Aeris SD: Optimized for short-distance triathlons and time trials. It’s narrower, stiffer, and designed for maximum power transfer in aggressive aero positions where comfort over many hours is less critical.
Design and Shape
- LD: A slightly wider platform and padding to reduce pressure over long durations. The shape encourages stable positioning without constant adjustments.
- SD: A slimmer shape for riders who stay locked in an aero tuck. Prioritizes efficiency over plush comfort.
Padding and Pressure Relief
- LD: Extra cushioning and a more pronounced central cut-out to reduce numbness during multi-hour efforts.
- SD: Firmer padding with minimal relief features—ideal for short, intense efforts where maximum stiffness matters.
Rider Profile
- Aeris LD: Best for triathletes racing long courses or athletes prioritizing comfort over all-day rides.
- Aeris SD: Best for short-course triathletes and time trialists who want every watt to count in shorter events.
Final Thoughts
So, what is the difference between Fizik Aeris LD and SD? The LD is engineered for endurance comfort in long-distance triathlons, while the SD is streamlined for short, high-intensity races. Choosing the right one depends on how long you’ll be in the saddle and whether you value comfort or pure performance more.
FAQs
1. Can I use the Aeris SD for long-distance races?
You can, but it may feel too firm after several hours. The LD is a better option for Ironman or endurance events.
2. Is the Aeris LD heavier than the SD?
Yes, slightly. The added padding and wider design increase weight, but it’s a small trade-off for extra comfort on long rides.
3. Which one is better for time trials?
The Aeris SD is the better choice for time trials. It’s stiffer, narrower, and built for short explosive efforts where aerodynamics and power transfer matter most.
