What is a single chainring bicycle?
Brief definition of the system
A single chainring bicycle is one that uses a single front chainring instead of the traditional double or triple chainring systems. The simplicity of the system is offset by a rear cassette with a greater range, which allows for practically the same range of gear ratios.
Difference compared to double or triple chainring
While the double chainring offers more combinations and a finer transition between gears, the single chainring simplifies shifting, eliminates chain crossovers, and reduces weight. In recent years, it has become the standard in mountain bikes and is gaining presence in gravel and road bikes.
Advantages of single chainring transmission
Mechanical simplicity
Just one shifter and one less derailleur. This reduces possible breakdowns and simplifies maintenance.
Less maintenance
By eliminating the front derailleur and a chainring, there are fewer parts exposed to wear or dirt, something especially useful in MTB or gravel.
Lighter weight
Fewer components mean less weight, which improves efficiency and makes the bike easier to handle.
Faster and more direct shifting
There is no need to coordinate two shifters or worry about chain drops. Each shift is direct and precise.
Better bike aesthetics
The frame design looks cleaner and more minimalist, with simple lines and less visible cabling.
Disadvantages of single chainring transmission
Smaller gear range
Although 12-speed cassettes offer a wide range, it is still more limited than a double chainring, especially for cyclists who need very low or very high gears.
Limitations on highly varied terrain
On routes with steep gradients or extreme changes in pace, you may miss an intermediate gear, especially if you want to maintain a constant cadence.
Increased wear on chain and cassette
Intensive use of the same chainring and the chain at steeper angles can accelerate wear if it is not kept well lubricated.
Is a single chainring better than a double chainring?
In mountain bikes (MTB)
In modern MTBs, the single chainring is practically standard. The 12 and 13 speed groups (like SRAM Eagle or Shimano XT/XTR) offer enough range for climbing and descending without losing efficiency. In addition, the weight savings and simplicity make it ideal for XC, trail and enduro.
On road bikes
The single chainring is gaining ground in gravel and bikepacking, but it still hasn't replaced the double chainring on the road. On very fast routes or those with steep gradients, cyclists usually prefer the precision of the double chainring. However, brands like SRAM already offer 1x drivetrains for road bikes with excellent results.
For beginner vs advanced cyclists
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Beginners: the single chainring makes use easier and avoids confusion with the gears.
- Advanced: they prefer its efficiency in MTB or gravel, although on the road some still opt for the versatility of the double chainring.
For which cyclists is a single chainring bike recommended?
For competition MTB and enduro
Ideal. It allows you to focus on riding without worrying about the front derailleur, reducing the risk of failures and improving traction.
For XC and bike-marathon cyclists
Perfect for those seeking efficiency, reduced weight, and simplicity. 10-52 cassettes cover practically all needs.
For urban use and bike touring
A practical option: less maintenance, fewer cables, and fewer complications. In addition, the single chainring works very well with internal gear systems or e-bikes.
For road and gravel
In gravel, the single chainring has become the norm: versatile, clean, and easy to maintain. On road, it depends on the terrain and the cyclist's preferences, although more and more users are opting for 1x setups for their simplicity.
What is the difference between single and double chainring?
The single chainring has only one front chainring and simplifies the drivetrain. The double chainring offers more gear range and smoother transitions between gears.
Does the single chainring improve MTB performance?
Yes. It reduces weight, simplifies shifting, and improves focus on riding. That’s why it’s the preferred option in Cross Country, Enduro, and Trail.
Is it worth having a single chainring on the road?
It depends on your use. If you’re looking for simplicity and reduced maintenance, yes. If you race or ride on very hilly terrain, a double chainring may still be more efficient.
What is the best chainring size for a single chainring?
It varies depending on the terrain and physical level:
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MTB XC: 32 or 34 teeth.
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Enduro: 30 or 32 teeth.
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Gravel: between 38 and 44 teeth.
- Road: 46 to 50 teeth depending on cadence and type of route.
Tuvalum Team
