BMC Fourstroke 01 TWO: In-Depth Review of This High-Performance XC Mountain Bike

If you’re in the market for a top-tier cross-country mountain bike that blends cutting-edge technology with race-ready performance, the Fourstroke 01 TWO from BMC deserves your attention. Designed for serious riders who demand efficiency on climbs and confidence on descents, this bike stands out in the crowded XC category. In this comprehensive review, we’ll dive deep into its features, specs, real-world performance, and why it might be the perfect addition to your garage. Whether you’re a competitive racer or an enthusiast tackling marathon trails, understanding what makes the Fourstroke 01 TWO tick can help you make an informed decision.

BMC Fourstroke 01 TWO first ride review | BikeRadar

What Sets the Fourstroke 01 TWO Apart in the XC World?

Cross-country (XC) mountain biking has evolved dramatically over the years, with bikes now needing to handle technical descents as well as they power up steep ascents. The Fourstroke 01 TWO embodies this shift, incorporating modern geometry and innovative features that cater to today’s demanding courses. BMC, a Swiss brand renowned for precision engineering, has poured years of expertise into this model, making it a favorite among pros and amateurs alike.

At its core, the Fourstroke 01 TWO is built around a premium carbon fiber frame that delivers an impressive balance of lightness and durability. Weighing in at around 24.5 pounds (depending on size and build), it’s optimized for speed without sacrificing strength. This bike is part of BMC’s Fourstroke lineup, which includes variations like the LT model for more trail-oriented riding, but the 01 TWO focuses squarely on XC racing and marathon events.

One standout feature is the Autodrop Technology integrated into the seatpost. This allows for effortless dropper post activation, dropping the saddle automatically with a deeper lever push—saving energy during intense races. It’s a game-changer for riders who need quick transitions between climbing and descending positions. Combined with 100mm of travel front and rear, the bike provides just enough suspension to smooth out rough terrain while maintaining pedaling efficiency.

Design and Build Quality: Premium Materials Meet Swiss Precision

When you first lay eyes on the Fourstroke 01 TWO, its sleek aesthetics are immediately apparent. Available in striking colorways like vibrant yellow with black accents or more subdued carbon black and red, it looks as fast as it rides. The frame uses BMC’s premium carbon layup, which is both stiff and compliant where it counts. This isn’t just about looks; the design incorporates internal cable routing for a clean profile and improved aerodynamics—minor details that add up in a race.

The rear suspension employs BMC’s APS (Advanced Pivot System) dual-link design, which ensures anti-squat characteristics for minimal pedal bob. This means your power transfers directly to the trail, not wasted in unnecessary movement. The shock is typically a RockShox SIDLUXE Select+ with TwistLoc lockout, allowing for on-the-fly adjustments to firm up the ride on smooth sections.

Up front, the fork is often a RockShox SID SL Select+ with 100mm travel, paired with the same TwistLoc system for seamless control. Tires come stock as Vittoria Mezcal 29×2.35in, offering excellent rolling speed and grip on varied surfaces. The wheels are DT Swiss XR 1700 with a 25mm inner width, providing a solid foundation for aggressive cornering.

BMC Fourstroke 01 Two SRAM GX Eagle Carbon Full Suspension Mountain Bike – Small / VibrantYellow

BMC has also paid attention to the little things, like the integrated chainstay protector and bottle cage mounts that accommodate two bottles in most sizes. For riders who value customization, the frame is compatible with various aftermarket components, though the stock build is already high-end.

Geometry and Handling: Modern Angles for Aggressive Riding

Geometry is where the Fourstroke 01 TWO truly shines. With a head tube angle of 66.5 degrees and a seat tube angle of 76.7 degrees, it’s slacker and steeper than traditional XC bikes, borrowing cues from trail bikes for better stability at speed. The reach on a medium frame is about 457mm, which positions the rider in a balanced, attack-ready stance. Chainstays are kept short at around 429mm, enhancing maneuverability without compromising traction.

This setup makes the bike feel planted on descents, even on technical World Cup-style courses. BMC’s Big Wheel Concept (BWC) optimizes the 29-inch wheels for rolling efficiency while tweaking the bottom bracket drop and front-center measurements for agile handling. If you’re coming from an older XC rig, the Fourstroke 01 TWO will feel more capable downhill, encouraging you to push limits without fear of washing out.

On climbs, the steep seat angle keeps your weight forward, promoting efficient power delivery. Paired with the lockout features, it climbs like a hardtail but with the added comfort of full suspension. Riders report that it excels in marathon events where endurance and versatility are key.

Key Specifications and Components

To give you a clear overview, here’s a breakdown of the typical specs for the Fourstroke 01 TWO (note that exact components can vary by year and region):

These components are chosen for reliability and performance, with carbon elements reducing weight where it matters most. The electronic shifting option in some builds adds precision, though the mechanical GX Eagle is plenty responsive for most users.

Carbon MTB BMC Fourstroke 01 TWO GX T-Type 12s Carbon Black / Red 2024

On-Trail Performance: From Climbs to Descents

Testing the Fourstroke 01 TWO on real trails reveals its true character. On uphill sections, the bike’s efficiency is immediately noticeable. The suspension remains active enough to absorb roots and rocks, but lock it out, and it pedals like a rocket. Riders praise its ability to maintain momentum on rolling terrain, thanks to the responsive kinematics.

Descending is where the modern geometry pays off. The slack head angle inspires confidence, allowing you to charge into chunky sections without hesitation. The Autodrop seatpost is a revelation—drop the saddle quickly for better control, then raise it effortlessly for the next climb. Braking is sharp and modulated, with the SRAM Level TLM setup providing ample stopping power.

In mixed conditions, like wet or loose trails, the Vittoria tires grip well, though some users swap them for more aggressive options for extreme weather. Overall, it’s a bike that rewards skilled riders, offering a blend of speed and control that’s hard to match in the XC segment.

For marathon racing, the Fourstroke 01 TWO’s comfort features shine. The carbon frame dampens vibrations, reducing fatigue over long distances. It’s not the lightest in its class, but the weight is well-distributed, making it feel nimble.

Pros and Cons: Weighing the Strengths and Weaknesses

Like any bike, the Fourstroke 01 TWO has its highs and lows. Here’s a balanced look:

Pros:

• Exceptional Climbing Efficiency: Steep seat angle and lockout system make ascents a breeze.
• Innovative Autodrop Seatpost: Saves energy and enhances descending capability.
• Modern Geometry: Handles technical terrain better than traditional XC bikes.
• High-Quality Build: Premium components ensure longevity and performance.
• Versatile for Racing and Trails: Suitable for XC races, marathons, and light trail duty.

Cons:

• Price Point: At around $9,000, it’s an investment not suited for beginners.
• Limited Travel: 100mm might feel insufficient for very rough trails compared to trail bikes.
• Weight: Slightly heavier than some ultralight competitors, though it’s still competitive.
• Customization Needed: Stock tires may not suit all conditions; upgrades could be necessary.

2022 BMC Fourstroke 01 LT TWO Full Suspension Carbon Mountain Bike

How Does It Compare to Competitors?

In the XC market, the Fourstroke 01 TWO goes head-to-head with bikes like the Specialized Epic, Trek Supercaliber, and Scott Spark RC. Compared to the Epic, the BMC offers a more progressive geometry and the unique Autodrop feature, making it better for aggressive descents. The Supercaliber’s IsoStrut suspension is innovative, but the Fourstroke’s APS system provides similar efficiency with added plushness.

Against the Spark, the BMC holds its own in weight and handling, though the Scott might edge it in outright speed on flat sections. If you’re considering the Fourstroke LT variant, it adds 20mm more travel for trail riding, but sacrifices some race sharpness. Ultimately, the Fourstroke 01 TWO excels for riders prioritizing a do-it-all XC machine.

Who Should Buy the Fourstroke 01 TWO?

This bike is ideal for competitive XC racers, marathon enthusiasts, or anyone who wants a high-performance full-suspension rig without venturing into trail bike territory. If you ride technical courses and value innovation like the Autodrop system, it’s a strong contender. Beginners might find the price and stiffness intimidating, but experienced riders will appreciate its precision.

Before purchasing, test ride one if possible—fit and feel are personal. Check for the latest models, as BMC occasionally updates specs.

BMC FourStroke 01 Two

Final Thoughts on the Fourstroke 01 TWO

The Fourstroke 01 TWO represents the pinnacle of BMC’s XC engineering, combining lightweight construction, advanced suspension, and rider-focused innovations into a package that’s ready to win races or conquer epic rides. While it’s not cheap, the performance gains justify the cost for dedicated cyclists. If you’re ready to elevate your riding, this bike could be your next obsession. Explore local dealers or online retailers to get your hands on one and experience the difference firsthand.