Description

Unveiling the BMC Fourstroke FS01 29 XTR DI2: The Ultimate Cross-Country Mountain Bike for Enthusiasts

In the world of mountain biking, few bikes have left as lasting an impression as the BMC Fourstroke FS01 29 XTR DI2. This high-performance cross-country (XC) machine from Swiss manufacturer BMC combines cutting-edge technology with lightweight design, making it a favorite among racers and trail riders alike. Whether you’re tackling steep climbs or navigating technical descents, the Fourstroke FS01 29 XTR DI2 stands out for its precision engineering and electronic shifting prowess. In this comprehensive review, we’ll dive deep into its features, specifications, real-world performance, and why it remains a sought-after model even years after its release.

If you’re in the market for a bike that blends speed, agility, and reliability, the Fourstroke FS01 29 XTR DI2 might just be the perfect fit. Let’s explore what makes this bike tick, from its carbon frame to the advanced Shimano components that elevate every ride.

BMC Four Stroke FS01 2014 With Shimano XTR

A Brief History of the BMC Fourstroke Series

BMC, short for Bicycle Manufacturing Company, has a reputation for producing premium bikes that push the boundaries of innovation. The Fourstroke series, introduced in the early 2010s, was designed specifically for XC racing, where efficiency and lightweight construction are paramount. The FS01 model, in particular, represents the pinnacle of this lineup, featuring full carbon construction and high-end specs.

The Fourstroke FS01 29 XTR DI2 variant emerged around 2013-2015, incorporating Shimano’s revolutionary XTR Di2 electronic shifting system. This was a game-changer at the time, offering lightning-fast, precise gear changes without the mechanical cables that could stretch or wear over time. Drawing from reviews and specs, this bike was praised for its versatility, handling everything from cross-country races to light trail duties. It’s no wonder that pros like Julien Absalon rode similar setups to victory in world championships.

Even in 2026, with newer models like the updated Fourstroke 01 LT available, the original FS01 holds its own as a classic. Its design philosophy—focusing on big-wheel efficiency with 29-inch wheels—continues to influence modern XC bikes.

Key Specifications and Build Details

At the heart of the Fourstroke FS01 29 XTR DI2 is its premium carbon frame, weighing in at around 2,070 grams including the shock and hardware for a small size. This lightweight yet stiff construction ensures excellent power transfer, making every pedal stroke count. The bike sports 100mm of travel front and rear, tuned for XC performance rather than aggressive downhill runs.

Here’s a breakdown of the core specs:

• Frame: Full carbon with BMC’s Advanced Pivot System (APS) dual-link suspension for efficient pedaling and active bump absorption.
• Fork: Typically a Fox Float CTD or similar high-end suspension fork with 100mm travel, adjustable for climb, trail, and descend modes.
• Shock: Fox Float CTD rear shock, integrated seamlessly into the frame.
• Wheels: 29-inch Easton or DT Swiss rims, paired with Continental Race King or similar tires for fast-rolling traction.
• Drivetrain: Shimano XTR Di2 electronic 2×11-speed setup, featuring a 34T front chainring for optimal gearing in races.
• Brakes: Shimano XTR hydraulic disc brakes with 180mm IceTech rotors for superior stopping power.
• Geometry: A 70-degree head tube angle, 73.5-degree seat tube angle, and 445mm chainstays provide a balanced, nimble ride.
• Weight: Approximately 24.9 pounds (11.3kg) for a small frame, making it one of the lighter full-suspension XC bikes of its era.

The dropouts are designed for a 12x142mm thru-axle system, enhancing stiffness and wheel security. Additional features include an integrated chain guide mount and replaceable brake boss threads, adding to its durability and ease of maintenance.

Products – Page 32 – BMC Switzerland AG

Innovative Features That Set It Apart

What truly elevates the Fourstroke FS01 29 XTR DI2 is its array of thoughtful features. The APS suspension system uses two short links to control the rear triangle, delivering a pedal-efficient platform that remains active over rough terrain. This means less energy lost to bob during climbs, yet plenty of compliance for descents.

The electronic Di2 shifting is a standout. Unlike traditional mechanical systems, Di2 uses battery-powered servos for shifts that are instantaneous and consistent, even under load. Riders like Lars Forster from the BMC team have highlighted how this setup, combined with a single front chainring option, reduces weight and simplifies operation.

BMC’s Big Wheel Concept (BWC) geometry optimizes the 29er wheels for better rolling speed and stability. The frame’s stiffness is impressive for an XC bike, allowing it to hold lines precisely on technical sections. There’s also a Trail Crew version with 120mm travel for those wanting more versatility, but the standard FS01 shines in pure XC scenarios.

Other notables include internal cable routing for a clean look, a 142×12 thru-axle rear dropout, and compatibility with wider bars and shorter stems for improved handling.

Performance on the Trail: Real-World Testing Insights

Having reviewed numerous XC bikes, the Fourstroke FS01 29 XTR DI2 impresses with its all-around capability. On climbs, the efficient suspension and lightweight build make it feel like a hardtail, accelerating quickly and maintaining momentum. The Di2 shifting ensures seamless gear changes, even when you’re pushing hard.

Descending is where the 29-inch wheels shine, rolling over obstacles with ease while the 70-degree head angle provides confident steering. Testers have noted its nimble handling despite the longer top tube, thanks to the 80mm stem spec. In bumpy sections, the APS system absorbs impacts without sacrificing pedaling efficiency, making it ideal for marathon races or long trail days.

Compared to contemporaries like the SRAM XO-equipped versions, the XTR Di2 offers a premium feel with flawless performance. It’s not the most aggressive descender— that’s where longer-travel models like the 2024 Fourstroke 01 LT come in—but for XC purists, it’s spot on.

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Pros and Cons: Weighing the Strengths

Like any bike, the Fourstroke FS01 29 XTR DI2 has its highs and lows. Here’s a balanced look:

Pros

• Exceptional lightweight carbon frame for superior climbing.
• Precise electronic shifting with Shimano XTR Di2 for reliable performance.
• Versatile geometry that handles both races and trails.
• High stiffness and efficiency, praised in reviews for cross-country standards.
• Clean design with integrated features like thru-axles and chain guides.

Cons

• Premium price point (around $8,500 originally), which might deter budget buyers.
• 100mm travel limits it to milder trails; not ideal for heavy enduro.
• Older model, so parts like Di2 batteries may require specific sourcing in 2026.
• Component spec might not satisfy ultra-competitive racers seeking the latest tech.

Overall, the pros far outweigh the cons for dedicated XC riders.

Comparisons with Modern Alternatives

How does the Fourstroke FS01 29 XTR DI2 stack up against newer bikes? The 2023 BMC Fourstroke 01 TWO, for instance, features updated geometry with a 66.5-degree head angle and Autodrop technology for automatic seatpost lowering. It offers more aggressive handling at a similar price.

The 2019 Fourstroke 01 ONE introduced an integrated dropper post and slacker angles (67.5 degrees), making it more trail-oriented while keeping the 100mm travel. If you prefer electronic shifting, the original FS01’s Di2 remains competitive, though SRAM’s wireless AXS systems in newer models provide alternatives.

For those on a budget, entry-level Fourstroke variants start under $5,000, but they lack the high-end XTR components.

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Maintenance and Upgrades for Longevity

To keep your Fourstroke FS01 29 XTR DI2 in top shape, regular maintenance is key. Charge the Di2 battery every few months, and service the suspension annually. The carbon frame is durable, but inspect for cracks after hard impacts.

Upgrades could include modern tires like Maxxis Rekon for better grip or a dropper post for added versatility. Wheels from DT Swiss XR 1700 can enhance rolling efficiency.

Why the Fourstroke FS01 29 XTR DI2 Still Matters in 2026

In conclusion, the BMC Fourstroke FS01 29 XTR DI2 is more than just a bike—it’s a testament to timeless design in the XC category. Its blend of lightweight construction, electronic precision, and efficient suspension makes it a joy for races and adventures alike. While newer models offer refinements, this classic holds appeal for riders seeking proven performance without the latest hype.

If you’re ready to experience the thrill, hunt for a well-maintained used model or explore BMC’s current lineup. Happy trails!

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