$960.00
The gravel racing scene has become increasingly more demanding, say hello to the CG 40 SL, crafted for speed and versatility on mixed terrains. At only 1560g, this wheel is light and engineered for rugged adventures, this wheel withstands gravel racing’s demands while ensuring a smooth, responsive ride. With a 40mm depth and 25mm internal width, it’s the perfect dimensions to elevate your gravel game with unmatched capability and performance.
| Size | Rear Wheel |
|---|---|
| Weight | 853g |
| Rim Material | Carbon | Hook Type |
| Rim Depth | 40mm |
| Rim Internal Width | 25.0mm |
| Rim External Width | 33.9mm |
| Rim Diameter | 700c | 622×25 ETRTO |
| Spoke Count | 24 |
| Tubeless Information | Tubeless Ready |
| Spoke Length (D / N-Drive) | 282mm / 279mm |
| Spoke Nipple | Alloy | External |
| Thru Axle | 12 x 142mm |
Are you a gravel enthusiast looking to shave precious grams off your bike while boosting speed, comfort, and control on mixed terrain? The CG 40 SL Rear Wheel from BMC Switzerland stands out as one of the top choices for riders who demand high performance without compromise. Designed specifically for the demands of modern gravel racing, this premium carbon rear wheel delivers exceptional versatility for everything from rough trails to long-distance adventures.
In this comprehensive guide, we’ll dive deep into what makes the CG 40 SL Rear Wheel a game-changer. From detailed specifications and real-world benefits to installation tips, maintenance advice, and comparisons, you’ll discover why this wheel is a favorite among competitive gravel cyclists in 2026. Whether you’re upgrading your current setup or building a new dream gravel rig, read on to learn everything you need to know.
The CG 40 SL Rear Wheel is a high-end carbon fiber wheel engineered by BMC for gravel racing and mixed-terrain riding. Part of BMC’s acclaimed CG series (optimized for gravel performance), it pairs perfectly with bikes like the Kaius 01 gravel racer, where it’s often equipped as standard on high-spec models.
Crafted with cutting-edge materials and precision engineering, this wheel prioritizes low weight, aerodynamic efficiency, and rugged durability. At just 853 grams, the rear version contributes to an incredibly light wheelset total of around 1,560 grams — ideal for quick accelerations and responsive handling on everything from smooth fire roads to chunky gravel sections.
What sets it apart is the thoughtful balance of features tailored for gravel: a 40mm rim depth for aero gains, a wide 25mm internal width for modern tire compatibility, and tubeless-ready construction that reduces flats and improves ride quality.
Here’s a breakdown of the technical details that make the CG 40 SL Rear Wheel so capable:
The bladed spokes and pawl hub deliver efficient power transfer while keeping rotational weight low. Plus, the hooked rim profile ensures secure tire fit even at lower pressures — crucial for confidence on loose surfaces.
These specs make the CG 40 SL Rear Wheel one of the lightest and most capable carbon gravel options available today.
Switching to the CG 40 SL Rear Wheel transforms how your gravel bike feels. The ultra-low weight (853g) means faster climbing and snappier acceleration — essential when racing or tackling hilly terrain. The 40mm depth adds aerodynamic advantages on faster sections without making the wheel twitchy in crosswinds, thanks to its optimized profile.
Ride comfort is another standout. The wide 25mm internal rim allows you to run larger-volume tubeless tires at lower pressures (down to 1.7 bar with big 76mm rubber), soaking up vibrations from rough gravel and reducing fatigue on long rides. Durability comes from the premium carbon construction and bladed spokes, which handle impacts better than many competitors.
In real-world gravel racing scenarios — like those on the BMC Kaius 01 — this wheel excels at maintaining momentum over choppy surfaces while providing precise handling. Riders report smoother, more responsive rides compared to heavier alloy wheels, with better cornering grip and overall efficiency.
If you’re chasing podiums or simply want a more enjoyable weekend adventure bike, the CG 40 SL Rear Wheel delivers unmatched versatility for mixed terrains.
In a crowded market of carbon gravel wheels (think Hunt 40 CGR, Scribe Gravel Carbon 40, or generic 40mm options), the BMC CG 40 SL Rear Wheel shines with its sub-900g weight and premium build quality. Many alternatives weigh 100-200g more per wheel, sacrificing acceleration.
The 25mm internal width is wider than older designs, supporting today’s popular 40-50mm gravel tires better than narrower rims. While some budget carbon wheels cut corners on hub quality or spoke tension, BMC’s pawl hub and factory setup ensure reliability out of the box.
Price-wise, at around $960 USD for the rear wheel alone, it’s a premium investment — but the performance, warranty (2-5 years with registration), and integration with BMC bikes justify it for serious riders. It’s lighter and more refined than many direct competitors while offering excellent tubeless performance.
Installing your new CG 40 SL Rear Wheel is straightforward for anyone comfortable with basic bike maintenance. Here’s a quick step-by-step:
For tubeless setup, the wheel arrives ready with tape and valve — just add sealant and your preferred gravel tire.
If you’re unsure, visit a professional mechanic. Proper installation ensures safety and optimal performance.
The CG 40 SL Rear Wheel is fully tubeless-ready, which means lower rolling resistance, better puncture protection, and the ability to run lower pressures for superior traction. Follow BMC’s guidelines: use compatible TLR tires and sealant, inflate carefully (max pressures listed per tire size), and check tape integrity regularly.
Recommended tire widths range from 35-50mm for most gravel setups, though the rim supports up to 76mm for more extreme adventures. Popular choices include Pirelli Cinturato Gravel or Challenge Gravel tires for excellent grip and durability.
Proper care extends the life of your investment. BMC recommends:
The Centerlock rotor interface requires a 40 Nm torque check on the lock ring when changing rotors. Following these steps prevents issues and maintains warranty coverage.
This wheel is ideal for:
If you’re a weekend warrior or beginner, a more affordable alloy option might suffice. But for enthusiasts chasing speed and comfort on demanding gravel, the CG 40 SL Rear Wheel is worth every penny.
Is the CG 40 SL Rear Wheel compatible with my bike? Yes, as long as you have a 12x142mm thru axle, Centerlock disc brakes, and Shimano HG freehub spacing. Always confirm tire clearance with your frame.
Does it come with a freehub body? Yes — Shimano HG 11-speed is pre-installed.
What is the warranty? Two years standard, extendable to five with BMC app registration. Crash replacement programs are also available.
Can I run it with tubes? Absolutely, though tubeless offers superior performance.
How much does the full wheelset weigh? Around 1,560g (front + rear), making it one of the lightest gravel options.
The BMC CG 40 SL Rear Wheel represents the pinnacle of modern gravel wheel design — lightweight, versatile, durable, and race-proven. Its carbon construction, optimized 40mm profile, and wide rim deliver noticeable improvements in speed, comfort, and confidence on any terrain.
If you’re ready to elevate your gravel game in 2026, this wheel is an outstanding upgrade. Pair it with a quality gravel bike and tubeless setup, and you’ll experience smoother, faster, and more enjoyable rides than ever before.
Ready to make the switch? Check availability through BMC dealers or authorized retailers. Ride safe, ride fast, and enjoy every kilometer on your upgraded gravel machine!
This guide is based on official BMC specifications and real-world gravel riding insights. Always follow manufacturer guidelines for safety and maintenance.
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