$1,500.00
The CG 39 SL has all the incredible properties of the CG 39, but now it’s super light (SL). Tipping the scales at only 1380g, paired with aero carbon spokes, this is BMC’s lightest carbon wheelset. Being tubeless ready and 25mm internal width, this wheel is futureproofed for all your riding needs.
| Size | Rear Wheel |
|---|---|
| Weight | 750g |
| 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) | 286mm / 287mm |
| Spoke Nipple | Alloy | External |
| Thru Axle | 12 x 142mm |
CG 39 SL Rear Wheel: The Ultimate Lightweight Carbon Gravel Upgrade for Serious Riders in 2026
If you’re chasing speed, climbing efficiency, and all-day comfort on gravel roads, the right rear wheel can transform your ride. The CG 39 SL Rear Wheel from BMC stands out as a premium choice for gravel enthusiasts and racers who demand top-tier performance without compromise. Designed specifically for demanding terrain, this carbon wheel delivers exceptional lightness, aerodynamic efficiency, and smooth handling that serious cyclists crave.
Whether you’re tackling steep gravel climbs, racing in events, or exploring mixed surfaces, investing in a high-quality rear wheel like this one pays dividends in speed, confidence, and enjoyment. In this comprehensive guide, we’ll dive deep into everything you need to know about the CG 39 SL Rear Wheel—from its technical specifications and real-world benefits to installation tips, maintenance advice, and buying considerations. Let’s explore why this wheelset component is becoming a favorite among gravel bike owners worldwide.
BMC, renowned for its innovative Swiss engineering in high-performance bikes, created the CG 39 SL Rear Wheel as part of its flagship gravel wheel lineup. This isn’t just another carbon rim—it’s the lightest in BMC’s carbon wheel family, optimized for gravel racing and aggressive riding.
Built around a 39mm-deep carbon rim, the wheel balances aero advantages with stability on loose surfaces. The “SL” designation means “Super Light,” achieved through advanced carbon construction and aero bladed carbon spokes. Paired with a matching front wheel, the full set weighs just 1,380g, making the rear unit approximately 750g on its own. That’s featherweight territory for a disc brake gravel wheel.
This rear wheel excels on steep gravel sections where every gram counts for climbing power. Riders report feeling stronger and more responsive, as the low rotational weight helps acceleration and reduces fatigue over long distances. It’s tubeless-ready right out of the box, with pre-installed rim tape and a valve included, so you can set it up for lower pressures and better traction without punctures.
Understanding the technical details helps explain why this wheel performs so well. Here’s a breakdown of what sets it apart:
These specs make the CG 39 SL Rear Wheel future-proof. The wide internal channel supports bigger tires for comfort and grip, while the aero profile slices through wind on faster sections. Carbon spokes add compliance without sacrificing rigidity, resulting in a ride that’s fast yet forgiving on rough gravel.
On the trail, the CG 39 SL Rear Wheel shines brightest. The lightweight design translates to quicker acceleration out of corners and easier efforts on long climbs. Many riders upgrading from heavier alloy wheels notice immediate improvements in responsiveness and overall bike handling.
The 39mm depth provides just enough aero benefit for road sections or fast gravel straights without making the wheel twitchy in crosswinds—a common complaint with deeper rims. Combined with the 25mm internal width, it allows optimal tire shape for lower rolling resistance and better cornering grip.
Real-world feedback from riders on BMC Kaius bikes (often equipped with this wheel) highlights how it makes legs feel fresher. The smooth, compliant ride quality absorbs vibrations from chunky gravel, reducing arm and hand fatigue. For racing, the quick Star Ratchet hub engagement ensures instant power transfer when you need to surge.
Whether you’re competing in gravel events or simply want a premium upgrade for weekend adventures, this rear wheel delivers confidence-inspiring stability at speed and nimble handling on technical descents.
Installing the CG 39 SL Rear Wheel is straightforward for anyone comfortable with basic bike maintenance. Here’s a clear process:
Pro tip: Use the included tubeless valve and tape for hassle-free setup. If you’re new to tubeless, watch reliable tutorials for best practices.
Caring for your CG 39 SL Rear Wheel is simple but essential for peak performance. Clean the rim and spokes regularly with a soft cloth and mild bike cleaner—avoid harsh chemicals that could damage carbon.
Inspect spokes for tension every few months and check the hub for smooth freehub engagement. Re-grease the Star Ratchet mechanism annually if you ride in wet or dusty conditions. For tubeless setups, refresh sealant every 3-6 months depending on mileage.
Store the bike indoors or use wheel bags for travel to protect the carbon rims. With proper care, this wheel will deliver thousands of kilometers of reliable service while maintaining its lightweight advantages.
Compared to entry-level alloy gravel wheels, the CG 39 SL Rear Wheel offers massive weight savings and better compliance. Versus other carbon options like Zipp or Enve gravel wheels, BMC’s design emphasizes race-oriented lightness and gravel-specific widths at a competitive price point (around $1,500 for the rear alone).
It pairs perfectly with BMC frames but works on most modern gravel bikes with compatible axle standards. Riders upgrading from stock wheels on mid-range bikes often report transformative improvements in speed and comfort.
This wheel is ideal for:
If your riding includes steep climbs, fast descents, and variable surfaces, the CG 39 SL Rear Wheel is a smart investment.
Look for authorized BMC dealers or official online stores for genuine parts and warranty support. Prices typically sit around CHF/USD 1,500 for the rear wheel. Check for bundle deals with the matching front wheel for the full lightweight experience.
Verify compatibility with your bike’s axle, brake, and drivetrain before ordering. Many shops offer professional installation and tubeless setup services.
Is it tubeless-ready out of the box? Yes—tape and valve are pre-installed for easy setup.
What tire sizes work best? 30mm to 50mm for most gravel riding; up to 71mm for extreme adventures.
How does the weight compare? At 750g for the rear, it’s among the lightest carbon gravel options available.
Is it compatible with my bike? Most modern gravel frames with 12x142mm rear spacing and disc brakes work perfectly.
What’s the warranty like? BMC offers standard coverage—check with your retailer for details.
The CG 39 SL Rear Wheel represents the pinnacle of gravel wheel technology: incredibly light, aerodynamically efficient, and built for real-world performance. Whether you’re racing, exploring, or simply want the best ride possible, this wheel elevates any gravel bike.
Ready to experience faster climbs, smoother trails, and more confident handling? Consider adding the CG 39 SL Rear Wheel to your setup today. Your legs—and your stopwatch—will thank you.
If you have questions about compatibility or setup for your specific bike, drop a comment below. Safe riding!
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