Why Chain Length Varies on an E-Bike
The number of chain links for any ENGWE M20 electric bike is a more complex factor than a single numerical value suggests. There is a specific number for a new model from the factory, but it does not give an owner a fixed length for all times. This value is calculated, considering specific gearing, suspension activity, and possible differences of replaced components. This guide investigates the five crucial aspects of this question, making all M20 owners fully understand these subtleties.
Thus, the concrete amount of chain links on any electric bike, including ENGWE M20, is not a standardized figure due to a variety of mechanical and geometric factors. It is done in such a way because chains have to be exactly the size of a specific drivetrain they are placed on. In other words, a uniform chain size is not appropriate for performance and safety. In this regard, the chain owner should be aware of its determiners to perform maintenance and change a worn link. The most influential factors on the final length are as follows: the size of the front chainring and the largest cog of the rear cassette; the distance from the center of the bottom bracket to the center of the rear axle; for a dual-suspension bike, that measurement changes as the suspension compresses and rebounds; the rear derailleur cage designed to take up the amount of chain slack; and minor differences during the assembling process on the assembly line.
ENGWE M20 Drivetrain and Chain Requirements
The ENGWE M20 is a fun-oriented model with a robust drivetrain system, meaning that any electric bike enthusiast will need a correctly specified chain for it. Since the product focuses on providing excellent performance on any terrain, chain quality appears to be mirrored in the rest of the components. Therefore, to understand its features, one would have to analyze the entire system. The M20 shows ENGWE’s aspiration for building fast and durable e-bikes, as each element is integrated into the system to be used optimally. Thus, every ride with the M20 will be smooth, secure, and fun because of the following specific characteristics influencing the chain choice:
1) A powerful motor.
The motor is a high-torque brushless variant with as much as 55 N.m. This necessitates a chain model that can hold the chain in place, as the powerful motor tends to unravel it.
2) Shimano 7-speed drivetrain.
This e-bike has a 7-speed system that requires a chain to adapt to such a solution. Thus, if one were to put a 9 or 10-speed accessory, the rest of the system would make odd noises and lose functionality over time.
3) Dual suspension system.
The M20 also has a dual suspension made up of a front hydraulic shock and a rear air shock absorber. The rear shock tends to squeeze when riding over a hole, changing the distance between the cassette and the front chainring. Thus, it is essential to have a chain that can stretch by an extra link or two.
4) Fat tires.
Finally, the fat tires, size 20 x 4.0", are sometimes oriented towards increasing general stability. Hence the model tends to be used off-road and in mud, with the sprockets having to be well-protected against stress.
Essential Chain Maintenance
The key to chain maintenance is the maintenance itself. Cleaning and lubricating the chain can prevent you from having to buy new cassettes and chainrings that will still end up wearing out due to a neglected chain – especially on a powerful electric bike such as the ENGWE M20. A properly lubricated and clean chain not only lasts longer but it also operates more smoothly, facilitates smoother gear shifts, and is much quieter. Implementing a simple maintenance routine can revolutionize your ride. Here is what we did to keep our chain in shape: regular cleaning, proper lubrication, use of a chain wear indicator tool, and proper riding technique.
Choosing and Sizing a New Chain for Your M20
Once you come to the point where you need to replace your chain, choosing the correct one becomes highly important for ensuring your e-bike runs back at peak performance. The market offers a plethora of chains to choose from, and picking one that is not compatible with your bike or is of a low-quality level can return you to frustrating and, perhaps, dangerous rides. In terms of selection, the top priorities here would be compatibility with your e-bike’s particular drivetrain and the need to handle the extra exertion that the electric motor puts on your bike’s components. The most obvious pick in this case would be an e-bike-specific chain, as it offers the best overall performance and the greatest peace of mind and value in the long run. Here is what you might need to consider when searching for a replacement:
- Speed compatibility. This is a must. The ENGWE M20 uses a 7-speed system, meaning that you need to choose a 7-speed chain or a chain that is compatible across different speed chains.
- E-bike rated chains. These are specially built for high-torque applications that an electric bike has. They feature stronger pins, stronger plates, and sometimes come with coatings that will last them longer under loads. Although they might seem pricier initially, they are often more affordable in the long run.
- Master link. Choose a chain that comes with a master or a quick link that can help you remove the chain with no chain breaker tool and hence make the cleaning and overall maintenance much easier.
| Feature | Standard Bike Chain | E-Bike Specific Chain |
|---|---|---|
| Pin strength | Standard | Reinforced, higher tensile strength |
| Plate material | Standard Steel | Often hardened, or chromized steel |
| Durability | Good for human power output | Excellent for high motor torque |
| Primary use | Acoustic Bicycles | Electric Bikes, Cargo Bikes |
As long as you have access to the necessary equipment and follow the right steps, sizing and installing a new chain is a fairly simple process. However, the length of the chain needs to be precise to allow your new chain to function flawlessly with your ENGWE M20’s drivetrain. Inadequately sized chains can lead to poor shifting, chains falling off, or in the worst-case scenario, derailleur destruction. To get started, you will require a chain breaker, a chain wear checker for future use, and master link pliers. The following are the two ways to guarantee that the chain is the accurate length:
Method A: Copy the Old Chain
- You must shift the old chain onto the smallest cog and chainring.
- You will use the chain breaker to carefully remove the old one or detach it using the master link.
- Place the old chain next to the new chain which has not been cut yet.
- Using the chain breaker, count the links and shorten the chain to the same exact length.
Important note: This only applies if your old chain was installed correctly to begin with.
Method B: The Sizing Formula
- Attach the new chain around the largest rear cog and the chainring without looping it into the derailleur.
- Join the two ends and pull them together until tight.
- As seen, look where the chain will overlap and then add two complete links to get our correct length.
- Cut the chain with the chain breaker.
- Loop the chain through the derailleur, and then connect the ends using the master link, to make it secure, ensure it clicks.
Conclusion and Frequently Asked Questions
In conclusion, the number of links on your ENGWE M20 chain is not just a number but a precise fitting adapted for its sophisticated drivetrain and dual suspension system. The following were the three most crucial questions on chain use:
Q1: Can I put a 9-speed chain on the 7-speed ENGWE M20?
A: No, you cannot. Chains are made with the exact width to perfectly match the cassette’s spacing. A narrow 9-speed chain on a 7-speed cassette will not only shift poorly but can actually get stuck between cogs, creating a safety hazard.
Q2: When do I change my chain?
A: This is best done with a chain wear gauge. In general, a well-maintained e-bike chain can last between 1,000 and 2,000 miles or more, but this highly depends on your riding context. Let the gauge take the guesswork out.
Q3: Do I need an e-bike specific chain?
A: While a 7-speed chain will work, it is not recommended. An e-bike specific one will last longer as its reinforced design features handle the M20's motor high torque for the maximum safety margin. Manage your chain properly and start a never-ending journey with your e-bike!
