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BMC Fourstroke 01 XT Di2: In-Depth Review of This High-Performance Cross-Country Mountain Bike

If you’re in the market for a top-tier cross-country mountain bike that combines cutting-edge technology with race-ready performance, the BMC Fourstroke 01 XT Di2 deserves your attention. This full-suspension MTB stands out in the crowded field of XC bikes, offering a blend of efficiency, agility, and durability that’s perfect for competitive riders and trail enthusiasts alike. In this comprehensive blog post, we’ll dive deep into what makes the Fourstroke 01 XT Di2 a standout choice, covering its specs, features, ride quality, and more. Whether you’re tackling steep climbs or navigating technical descents, this bike is engineered to elevate your riding experience.

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Understanding the BMC Fourstroke Lineup

BMC, a Swiss brand renowned for its precision engineering, has a long history of producing high-end bicycles that push the boundaries of performance. The Fourstroke series, in particular, is designed for cross-country racing and marathon events, where speed and efficiency are paramount. The Fourstroke 01 XT Di2 is part of the premium 01 lineup, featuring a carbon frame that’s both lightweight and robust. Released around 2017, this model incorporates electronic shifting for seamless gear changes, making it a favorite among riders who demand reliability under pressure.

What sets the Fourstroke 01 XT Di2 apart from other XC bikes? It’s the integration of advanced components like Shimano’s XT Di2 electronic drivetrain, which provides precise, effortless shifting even in muddy or dusty conditions. Paired with BMC’s APS (Advanced Pivot System) suspension, this bike delivers 100mm of travel front and rear, ensuring smooth handling over rough terrain without sacrificing pedaling efficiency. If you’re searching for a mountain bike that excels in both uphill sprints and downhill flow, this could be your ideal match.

Frame and Build Quality: Carbon Excellence

At the heart of the Fourstroke 01 XT Di2 is its premium carbon frame, crafted using BMC’s high-modulus carbon fiber technology. This material choice keeps the weight low—typically around 24-25 pounds for a complete build—while providing exceptional stiffness for power transfer. The frame features internal cable routing for a clean aesthetic and improved aerodynamics, along with a tapered head tube that enhances steering precision.

One notable design element is the BWC (Big Wheel Concept) geometry, optimized for 29-inch wheels. This setup promotes better rollover on obstacles and maintains momentum on flat sections. The rear triangle uses a 12x142mm thru-axle for added rigidity, and the dropouts are compatible with direct-mount derailleurs. Riders appreciate the frame’s compliance, which absorbs vibrations without feeling flexy during hard efforts. For those concerned about durability, BMC’s engineering ensures the frame can handle the rigors of XC racing, from rocky trails to high-speed descents.

In terms of sizing, the Fourstroke 01 XT Di2 is available in small, medium, and large options, catering to a range of rider heights. The paint scheme often features a sleek black finish with accents that highlight its aggressive profile.

Suspension Setup: Efficient and Responsive

Suspension is where the Fourstroke 01 XT Di2 truly shines. The APS dual-link system offers 100mm of rear travel, controlled by a Fox Float shock (often with Kashima coating for reduced friction). This setup is tunable with remote lockout, allowing you to firm up the suspension for climbs or sprints. Up front, a Fox 32 Float fork matches the rear with 100mm travel, featuring FIT damping for adjustable compression and rebound.

The result? A bike that pedals like a hardtail but soaks up bumps like a trail machine. Reviewers note that the suspension remains active under power, preventing energy loss while providing traction on loose surfaces. Whether you’re climbing technical roots or descending chunky rock gardens, the Fourstroke 01 XT Di2 maintains composure, making it suitable for modern XC courses that demand versatility.

BMC Fourstroke 01 One MTB Turquoise / Black 2023

Drivetrain: Shimano XT Di2 Electronic Shifting

The “Di2” in Fourstroke 01 XT Di2 refers to Shimano’s Digital Integrated Intelligence electronic shifting system, integrated into the XT groupset. This 2×11-speed setup (typically with 36-26T crankset and 11-40T cassette) offers a wide gear range for tackling varied terrain. Electronic shifting means no cables to stretch or contaminate, resulting in lightning-fast, accurate shifts every time.

Compared to mechanical systems, XT Di2 reduces rider fatigue by eliminating the need for heavy lever throws. It’s programmable via Shimano’s E-Tube app, allowing customization of shift speeds and multi-shift functions. Paired with a Shimano XT chain and crankset, the drivetrain is reliable and low-maintenance, ideal for long races or epic rides. If you’re upgrading from an older MTB, the electronic precision of the Fourstroke 01 XT Di2 will feel like a game-changer.

Braking and Wheels: Stopping Power and Rolling Efficiency

Braking duties are handled by Shimano XT hydraulic disc brakes, with 160mm rotors front and rear for consistent modulation and power. These brakes excel in wet conditions, providing confidence-inspiring stopping without fade during extended descents.

The wheels are typically DT Swiss-based, with carbon rims for the premium build, offering a balance of lightness and strength. Tubeless-ready tires like Continental X-King or RaceKing in 29×2.2-inch size provide excellent grip and low rolling resistance. The combination ensures the Fourstroke 01 XT Di2 rolls fast on smooth trails while maintaining traction on loose gravel or mud.

Geometry: Modern and Aggressive for XC

The geometry of the Fourstroke 01 XT Di2 reflects BMC’s forward-thinking approach. With a head tube angle around 67-68 degrees (depending on size), it’s slack enough for stability on descents but steep enough for quick handling. The seat tube angle is approximately 73-74 degrees, promoting an efficient pedaling position.

Reach figures vary by size: about 400mm for small, 425mm for medium, and 450mm for large. Chainstays are kept short at 425-430mm, enhancing agility. The bottom bracket drop is around 40mm, lowering the center of gravity for better cornering. Overall wheelbase hovers around 1100-1150mm, striking a balance between stability and maneuverability.

This geometry makes the Fourstroke 01 XT Di2 feel planted on technical sections while remaining responsive on twists and turns. It’s a step up from older XC bikes, aligning with today’s more demanding race courses.

Fs01 Bmc Fs Xt Di2 Bicycle Bmc Fourstroke 01 Xt 2017 BMC Fourstroke FS01 XX1

Ride Performance: On the Trail

How does the Fourstroke 01 XT Di2 perform in real-world conditions? On climbs, the efficient suspension and lightweight frame allow for rapid acceleration. The lockout feature turns it into a rocket for fire roads, and the electronic shifting ensures you never miss a gear.

Descending, the slack geometry and plush fork inspire confidence, letting you push limits without feeling out of control. It’s not a full-on trail bike, but for XC standards, it handles drops and roots impressively. Cornering is sharp thanks to the short chainstays, and the 29-inch wheels maintain speed over rough patches.

In reviews, riders praise its all-around capability, noting it’s fun for non-race days too. However, some mention it’s best suited for lighter riders or those focused on speed rather than heavy-duty enduro.

Components and Cockpit: Comfort Meets Control

The cockpit features a BMC MSM stem (around 70-90mm) and flat bar for precise control. The Fizik Tundra saddle provides comfort during long rides, and the overall build emphasizes ergonomics.

Additional touches include integrated chainstay protection and bottle cage mounts, enhancing practicality.

Pros and Cons of the Fourstroke 01 XT Di2

Pros:

• Lightweight carbon frame with excellent stiffness
• Precise electronic shifting via Shimano XT Di2
• Efficient APS suspension for versatile performance
• Modern geometry for confident handling
• High-quality components that stand up to abuse

Cons:

• Premium price point (around $6,000-$8,000 when new)
• Limited travel may not suffice for aggressive trail riding
• Electronic system requires battery maintenance
• Older model, so parts availability might vary

2022 Bmc Fourstroke 01 TWO Mountain Bike – Small

Who Should Buy the BMC Fourstroke 01 XT Di2?

This bike is ideal for competitive XC racers, marathon enthusiasts, or riders seeking a high-performance full-suspension MTB. If you value speed, efficiency, and tech like electronic shifting, it’s a worthy investment. For casual trail riders, consider newer models, but the Fourstroke 01 XT Di2 remains a classic for its era.

Maintenance Tips for Longevity

To keep your Fourstroke 01 XT Di2 in top shape, regularly charge the Di2 battery, clean the drivetrain, and service the suspension annually. Use tubeless sealant for puncture protection, and check bolt torques to maintain frame integrity.

Comparison to Modern Alternatives

Compared to current XC bikes like the BMC Fourstroke 01 TWO (with updated geometry and Autodrop seatpost), the 2017 Fourstroke 01 XT Di2 holds its own in efficiency but lacks some descending prowess. Versus competitors like the Specialized Epic or Trek Supercaliber, it offers superior shifting tech at a potentially lower used price.

BMC Fourstroke 01 LT ONE – In our big 2022 downcountry group test | ENDURO Mountainbike Magazine

Final Thoughts

The BMC Fourstroke 01 XT Di2 is more than just a mountain bike—it’s a precision instrument for conquering cross-country challenges. With its carbon construction, electronic drivetrain, and balanced suspension, it delivers an exhilarating ride that’s hard to beat. If you’re ready to invest in a bike that combines Swiss engineering with Japanese innovation, this model won’t disappoint. Explore local dealers or used markets to get your hands on one, and experience the thrill for yourself.

For more insights on cross-country mountain bikes, electronic shifting systems, or full-suspension MTBs, check out our other posts. Happy riding!