02 January

2023

Single-chainring transmission: advantages and disadvantages

Among the latest trends in the world of bikes, one has stood out that may puzzle those of us who have been enjoying this sport for a while. It's none other than the implementation of a one-by (1x) drivetrain.

Is it really a good idea to install a one-by (1x) drivetrain on a bike? What are the advantages and disadvantages of this option? In this article, we'll analyze it so you can make the best decision.

Advantages of the One-By (1x) Drivetrain

Since the launch of the first SRAM XX1 one-by (1x) groupset in 2012, they have become increasingly common, becoming a highly sought-after option in our professional bike shop. Let's take a look at the advantages that make many opt for this option.

1. Simplicity of the System

By using a single chainring, all the problems associated with the front derailleur are completely eliminated. Moreover, since only one shift lever is needed, the frame looks much cleaner and uncluttered.

2. Reduced Weight

Eliminating the front derailleur, shift lever, housing, cable for one or two chainrings, and having only one chainring results in a reduced overall bike weight by several grams.

3. Improved Chain Retention

Thanks to the special tooth design of the one-by (1x) chainring, there is better chain retention compared to traditional systems.

4. No Duplicate Gear Ratios

When using multiple chainrings, it's common to have duplicated gear ratios. With a one-by (1x) drivetrain system, gear ratios are unique.

Disadvantages of the One-By (1x) System

Like everything in life, the one-by (1x) drivetrain also has serious drawbacks that make the decision not so straightforward. These are the main disadvantages of a one-by (1x) drivetrain:

1. Higher Initial Investment

Switching to original one-by (1x) groupsets from Shimano and SRAM is not an expense that all cyclists are willing to make to try a one-by (1x) system. Therefore, the cost is a factor to consider.

2. Increased Physical Demand

Having only one chainring determines our climbing ability and the required pedaling cadence. This can lead to higher muscle fatigue.

3. Limited Gear Range

Although a one-by (1x) system avoids duplicated gear ratios, it also lacks many other gear combinations that are available with two and three chainrings. Therefore, a one-by (1x) drivetrain requires a trial and error period to find the right chainring size for your physical ability and riding conditions.

So, Is the One-By (1x) Drivetrain Worth It?

At this point, you may not be sure whether it's really worth it to install a one-by (1x) drivetrain. The reality is that the one-by (1x) system is not suitable for all cyclists.

It depends on the type of cyclist you are and the performance you seek in your bike; the gear ratios provided by one-by (1x) drivetrains may either fall short or be exactly what you need.

One way to determine if it's worth it for you is to ask yourself:

• How often do I shift gears while riding?
• Do I frequently change gears to maintain my ideal cadence?
• Do I often pedal with a cross-chained position?

If the answers are rarely or almost never, a one-by (1x) drivetrain is very likely a good alternative in your case.