This article compares carbon vs. aluminum wheels. I compare mainly road bike wheels, but most principles apply to MTB and gravel wheels.
Based on my experience, discussions with mechanics, and pro cyclists, I summarized the pros and cons of both.
In short:
Carbon wheels are more aero, stiffer, lighter, and look cooler, but are also more expensive than aluminum wheels. They are suitable for serious cyclists who care about their performance and have extra money to spend.
Continue reading to learn helpful info that will help you decide whether you should upgrade your current wheelset or not.
What Are Carbon Wheels?
Carbon bicycle wheels use carbon rims instead of aluminum wheels. Their depth can vary from shallow (around 25mm) to deep-section (88 mm).
*There are also carbon discs used in time trials.
The deeper the rims, the better the aerodynamics. One of the benefits of carbon wheels is also their lower weight than aluminum wheels.
You might be interested in the best carbon road bike wheels from various price ranges.
What Are Aluminum Wheels?
Aluminum bicycle wheels use aluminum rims instead of carbon. They are mostly shallow because deep-section aluminum wheels would be heavy.
Aluminum wheels are more affordable than carbon wheels and are often used as stock wheels on bicycles.
But some riders use them as training wheels or for bad weather.
TIP: Browse the best budget road bike wheels. The selection also includes aluminum wheels.
Advantages & Disadvantages of Carbon vs. Aluminum Wheels
I summarized the most important advantages and disadvantages of carbon vs. aluminum wheels in the following table. I explain them more in-depth below.
| Wheels (Rims) Material | Pros | Cons |
|---|---|---|
| Aluminum (or Alloy) | • More affordable¹ • Better braking performance in wet conditions or long descents (rim brakes) • Durable | • Heavier than carbon wheels • Not as stiff (assuming the same rim weight) • Less aero |
| Carbon | • Lightweight • Stiff • More aero (widely available in various rim depths) • Look cool | • Less affordable² • Worse braking performance in wet conditions or long descents (rim brakes) • The braking track of the rim brake carbon wheels wears off over time. |
¹The price of aluminum wheels ranges from dozens of dollars to $1500.
²The price of carbon wheels starts from around $300 and can easily exceed $2000.
Please, keep in mind that these price ranges may vary. I included them to give beginners a better idea of what they can expect.
Source: cyclistshub.com
Price
The price is the first and most obvious talking point when choosing new wheels.
Should you buy cheap carbon wheels or expensive aluminum ones?
Well, there is no clear answer. It depends on your preference and riding style.
Aluminum wheels start at dozens of dollars and can exceed $1000, while carbon ones start at around $300 and easily exceed $2000.
However, you don’t have to spend $1900 on a quality carbon wheelset. For example, most Chinese carbon wheels offer a better price/value ratio than wheels from mainstream brands.
Aerodynamics
Many people wrongly assume that the main advantage of carbon wheels is their weight.
Well, it’s one of their benefits (more about it below), but carbon wheels excel mainly in aerodynamics.
Especially if you often ride on flats, rolling terrain, or descents, the deeper rim profile will save you precious energy.
There are also deep-section aluminum wheels, but they are much heavier than carbon wheels.
Weight
Carbon wheels are lighter on average than aluminum wheels. I summarized data of more than 350 road bike wheelsets and got the following results:
| Material / Brakes | Disc | Rim | Total Avereage |
|---|---|---|---|
| Aluminum | 1685g | 1614g | 1654g |
| Carbon | 1531g | 1493g | 1514g |
Keep in mind that included aluminum wheels were shallow (under 35mm), while carbon also included deep-section rims (from 20mm to 88mm).
If you are looking for deep-section carbon wheels, the lower weight doesn’t always have to be a better choice. It again depends on the terrain you ride in.
Heavier wheels have better inertia, so they can maintain speed better than lightweight wheels but are not as suitable for climbing.
Braking Performance
The braking performance is another often discussed topic.
For example, carbon rim brake wheels are known for their bad braking performance in wet conditions.
Additionally, if the carbon rims are poorly made, braking can heat up the tube, which expands and explodes during long descents and in a hot environment.
However, this topic seems to be less relevant with the growing popularity of disc brake wheels.
Stiffness
Comparing the stiffness of two wheelsets requires a lot of experience and special equipment.
However, the general rule is that carbon wheels are stiffer and can transfer energy more efficiently than aluminum wheels.
I’ve tested multiple carbon wheelsets, and their differences are sometimes hard to notice.
But the differences between aluminum and carbon wheels are noticeable.
Appearance
The last thing I want to point out is the appearance. A bicycle with deep-section carbon wheels looks much cooler than with shallow aluminum wheels.
See for yourself:
Carbon vs. Aluminum Wheels FAQ
Conclusion
Both aluminum and carbon wheels will find their fans. I used aluminum wheels for years before I switched to carbon wheels.
I see their biggest benefit in better aerodynamics which allows me to ride faster.
The lower weight and higher stiffness are handy for sparing valuable energy (i.e., watts).
And lastly, they simply look much cooler than shallow aluminum wheels.
Their main disadvantage is the higher price. Luckily, there are many quality but affordable carbon wheels on the market.
Browse More Road Bike Wheels Related Content
