$1,045.00
BMC’s all-new carbon gravel wheelset with 39mm rim depth, a star ratchet hub and weight of only 1499g, this wheelset offers everything you need for your gravel setup.
| Size | Rear Wheel |
|---|---|
| Weight | 802g |
| Rim Material | Carbon | Hook Type |
| Rim Depth | 39mm |
| Rim Internal Width | 25.0mm |
| Rim External Width | 32.0mm |
| Rim Diameter | 700c | 622×25 ETRTO |
| Spoke Count | 24 |
| Tubeless Information | Tubeless Ready |
| Spoke Length (D / N-Drive) | 275mm / 278mm |
| Spoke Nipple | Alloy | External |
| Thru Axle | 12 x 142mm |
Are you a gravel enthusiast looking to upgrade your ride with top-tier performance? The CG 39 Rear Wheel from BMC stands out as one of the most exciting options in the world of high-performance cycling wheels. Designed specifically for gravel racing and adventure riding, this carbon wheel delivers the perfect balance of speed, comfort, and durability.
Whether you’re tackling rough trails, steep climbs, or long-distance mixed-terrain routes, the CG 39 Rear Wheel transforms how your bike feels and performs. In this comprehensive guide, we’ll dive deep into everything you need to know about this standout wheel – from its technical specs to real-world benefits, installation tips, and buying advice. If you’re serious about elevating your gravel game in 2026 and beyond, keep reading.
BMC, the renowned Swiss bike manufacturer, created the CG 39 Rear Wheel as part of their dedicated gravel wheel lineup. The “CG” stands for Carbon Gravel, and the “39” refers to the impressive 39mm rim depth – a sweet spot for aerodynamics without sacrificing versatility on unpredictable surfaces.
Unlike traditional road wheels, this rear wheel is purpose-built for gravel. It combines lightweight carbon construction with thoughtful engineering that handles everything from smooth fire roads to chunky rock gardens. The wheelset (when paired with the matching front) tips the scales at just around 1,499g, making the rear wheel itself a featherweight 818g.
What sets it apart is the attention to real-world riding. BMC tested these wheels extensively with pro riders, ensuring they deliver exceptional performance no matter the terrain or how fatigued your legs feel. It’s not just about specs on paper – it’s about creating that “new edge” in your ride experience.
Understanding the numbers helps you see why the CG 39 Rear Wheel excels. Here’s a breakdown of its key features:
These specs make the CG 39 Rear Wheel incredibly versatile. The 25mm internal width allows modern gravel tires to sit perfectly, improving grip, comfort, and rolling efficiency.
Why invest in a premium wheel like the CG 39 Rear Wheel? The advantages go far beyond weight savings:
1. Superior Aerodynamics and Speed The 39mm rim depth cuts through the wind beautifully while maintaining stability in crosswinds – a common issue on exposed gravel roads.
2. Enhanced Comfort and Compliance Carbon construction absorbs vibrations better than alloy wheels. Paired with wider tires, the CG 39 Rear Wheel delivers a smoother ride over rough terrain, reducing fatigue on long rides.
3. Lightweight Yet Strong At 818g, the rear wheel keeps your bike nimble for quick accelerations and steep climbs without compromising durability. The Sapim spokes and Star Ratchet hub provide bombproof reliability.
4. Tubeless-Ready Performance Run lower pressures for better traction and puncture resistance. The included tubeless setup makes switching tires effortless.
5. Versatile Tire Fitment From slick 30mm tires for mixed surfaces to chunky 50mm+ options for pure off-road, this wheel adapts to your riding style.
Riders report noticeable improvements in cornering confidence, climbing efficiency, and overall bike handling after installing the CG 39 Rear Wheel.
BMC also offers the CG 39 SL (Super Light) version with aero carbon spokes. The SL rear wheel drops to around 750g, making the full wheelset just 1,380g – BMC’s lightest carbon gravel option yet.
The standard CG 39 Rear Wheel uses premium Sapim CX-Sprint spokes and delivers outstanding value at $1,045. The SL variant prioritizes every gram for competitive racers. Both share the same rim profile and hub technology.
If you’re a weekend warrior or endurance rider, the standard CG 39 Rear Wheel gives you 95% of the performance at a more accessible price. Racers chasing podiums will appreciate the SL’s marginal gains.
The CG 39 Rear Wheel shines brightest on BMC’s own Kaius series but works beautifully with most modern gravel bikes. It fits standard 12x142mm thru-axle frames and pairs perfectly with 1x or 2x drivetrains thanks to the XDR freehub.
Popular setups include:
The wheel’s wide rim supports the latest gravel tire trends, making it future-proof for years of riding.
Installation is straightforward for anyone comfortable with basic bike maintenance:
Maintenance tips:
With proper care, the CG 39 Rear Wheel will deliver thousands of trouble-free kilometers.
Gravel riders who’ve switched to the CG 39 Rear Wheel consistently praise its balanced feel. One reviewer noted, “It made my bike feel alive on technical descents while staying composed at high speeds.” The combination of low weight and high stiffness translates to confident handling whether you’re racing or bikepacking.
The wheel excels in mixed conditions – fast enough for road sections yet compliant enough for rocky singletrack.
Priced at approximately $1,045 (rear wheel only), the CG 39 Rear Wheel represents a smart investment for performance-focused riders. Official BMC dealers and premium online retailers stock it regularly.
Look for bundles that include the matching front wheel for the best value. Watch for seasonal sales or complete wheelset deals. Always verify the SRAM XDR freehub matches your cassette.
Is the CG 39 Rear Wheel tubeless ready out of the box? Yes – rim tape and valve come pre-installed.
What tires work best? 30-50mm gravel tires offer the ideal balance of speed and comfort.
Does it require special tools? No. Standard thru-axle and disc brake tools are all you need.
Is it worth upgrading from alloy wheels? Absolutely. The weight savings and ride quality are transformative.
If you want a wheel that enhances every aspect of your gravel riding – speed, comfort, confidence, and fun – the CG 39 Rear Wheel delivers. Its thoughtful design, premium materials, and proven real-world performance make it a standout choice for 2026 and beyond.
Ready to transform your bike? The CG 39 Rear Wheel isn’t just another upgrade; it’s a complete performance revolution for gravel enthusiasts who refuse to compromise.
Whether you ride competitively or for pure adventure, this wheel will make every kilometer more enjoyable. Check with your local BMC dealer or trusted online retailer today to bring home the CG 39 Rear Wheel and experience the difference for yourself.
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