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Load image into Gallery viewer, RockShox CSU - SID Ultimate 80-100 mm DebonAir (2020+), 29"/27.5+, 51mm Offset, Boost 15x110mm, Tapered Steerer,
Load image into Gallery viewer, RockShox CSU - SID Ultimate 80-100 mm DebonAir (2020+), 29"/27.5+, 51mm Offset, Boost 15x110mm, Tapered Steerer,
Load image into Gallery viewer, RockShox CSU - SID Ultimate 80-100 mm DebonAir (2020+), 29"/27.5+, 51mm Offset, Boost 15x110mm, Tapered Steerer,
Load image into Gallery viewer, RockShox CSU - SID Ultimate 80-100 mm DebonAir (2020+), 29"/27.5+, 51mm Offset, Boost 15x110mm, Tapered Steerer,

SKU: FK4247

RockShox SID Ultimate 29"/27.5+ Boost 15x110mm Tapered Steerer 80-100mm DebonAir Suspension Fork - Lightweight 32mm Crown/Steerer/Uppertube, Performance-Optimized for Cross-Country & Trail Riding

Regular price $270.94
$337.00 Sale price $270.94 Regular price
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Description

Upgrade your XC and trail biking experience with the RockShox CSU SID Ultimate 80-100 mm DebonAir Fork (2020+). Engineered for precision, performance, and lightweight durability, this high-performance suspension fork is ideal for competitive riders and serious enthusiasts seeking optimal handling on rugged terrains.

Materials & Construction:

Built with a 32mm magnesium crown and high-strength aluminum upper tubes, the RockShox SID Ultimate is crafted for durability and reduced weight. The tapered aluminum steerer tube ensures precise steering response and compatibility with modern frame standards, while the robust chassis promotes reliable performance in demanding trail conditions.

Performance & Engineering:

Designed with RockShox's exclusive DebonAir air spring technology, the SID Ultimate delivers consistent, plush suspension with enhanced small bump sensitivity and respondiveness. The lightweight design combined with an ultra-stiff chassis ensures superior stiffness-to-weight ratio, providing increased control and confidence on technical descents and sharp cornering.

Components & Technology:

Equipped with 51mm offset and Boost 15x110mm thru-axle compatibility, this fork offers improved steering precision and improved wheel stiffness. The adjustable rebound and low-friction seals maximize plushness and durability, while the dynamic Solo Air spring allows easy customization of pressure to match rider weight and riding style.

Style & Use Case:

Designed for cross-country, marathon, and trail riders, the SID Ultimate boasts a sleek, aggressive aesthetic that complements modern bike builds. Its versatile travel options of 80-100mm make it perfect for competitive XC racing or aggressive trail adventures, providing smooth suspension and responsive handling where it counts.

Innovative Features:

The RockShox SID Ultimate's DebonAir technology, combined with its lightweight magnesium crown, makes it one of the most efficient XC forks on the market. The tapered steerer and Boost compatibility ensure streamlined integration with today's modern bike frames, delivering both performance and style.

Optimize your ride with the RockShox SID Ultimate 80-100mm DebonAir Fork - the perfect combination of lightweight engineering, advanced suspension technology, and trail-ready design.

  • Premium aluminum construction with lightweight DebonAir air spring technology for smoother, more responsive ride performance across varied terrains.
  • Engineered with 32mm crown and steerer tube assemblies, offering improved durability and precise handling for aggressive trail riding and XC racing.
  • Compatible with 29" and 27.5+ wheels, this fork features a 51mm offset and Boost 15x110mm thru-axle for enhanced stability, improved tracking, and seamless integration with modern mountain bike frames.
  • Tapered steerer tube design ensures maximum steering stiffness and compatibility with a wide range of high-performance bike builds, enhancing control and confidence on technical descents.
  • Featuring state-of-the-art engineering and innovative components, the SID Ultimate 2020+ forks deliver top-tier agility, increased damping efficiency, and customizable adjustability for professional-grade XC and trail riding.
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We pride ourselves on our ability to ship and deliver your gear with excessive speed! We ship from 22 locations throughout the United States and most orders will arrive in 3 days or less with Free Shipping on orders over $75!

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Most orders placed during the workweek before 1:00 PM Eastern time ship the same day, but during peak/holiday season or depending on inventory location handling time can take up to 48 hours. If you have questions regarding shipping estimates, don't hesitate to get in touch with us before placing the order. There is a direct signature requirement for all orders over $500.

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365 Cycles puts the customer above everything. Our number one goal is your satisfaction. When you press the shift lever you want the gears to shift, and when you buy bicycle parts, you want the bicycle parts to arrive on time in new condition. With over 60,000 products and 22 warehouse locations throughout the country, we have the parts you need and they are coming in hot!

Living an active lifestyle is just that, a lifestyle that never goes away and our goal is to always exceed your expectations so we can take this lifelong journey together. We strive to have the parts you need, at competitive prices with unmatched shipping speeds!

If there is ever an issue with an order we will work at warp speed to fix our mistake and make sure you never go a day without a bicycle! If you are not receiving the quality of service you need from one of our exceptionally qualified bicycle experts, tell them Ben Berman told you to tell them "Customer Loyalty" and then name your terms.

Our team is waiting to help you 7 days a week and they are more qualified to help than I am but if you ever feel like you're not getting the service you need I’m personally asking you to email me at ben@365cycles.com with "CUSTOMER LOYALTY" in the title and I will personally handle your order.

Over the years we have served millions of satisfied customers and continue to serve many of them today. With your feedback, we are confident we can take this lifelong journey together and build a friendship that goes beyond parts and accessories.

“If you want to go fast, go alone, if you want to go far, go together.” -Someone Smart

Ben Berman Founder & CEO of 365 Cycles


Company Core Values: 

These were established by the members of our team and we use them every week to call out team members who have shined in one of these areas. Feel free to let us know at info@365cycles.com if someone you worked with has gone above and beyond in one of these areas. 

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If it is to be, it’s up to me" You are personally responsible for controlling the outcome.

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If you want to go fast, go alone, if you want to go far, go together. Get your team involved and become stronger together.

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