How to Put a Mountain Bike Chain On [Properly]

Last Updated on August 26, 2025 by Jaxon Mike

As an avid mountain biker, I know how frustrating it can be when your trusty bike’s chain decides to give up the ghost mid-ride. Whether it’s a broken link, a worn-out chain, or just the natural wear and tear of endless miles on the trail, having to deal with a loose, dangling chain can really put a damper on your riding experience. But fear not, my fellow off-road enthusiasts! In this comprehensive guide, I’m going to walk you through the step-by-step process of properly putting a new mountain bike chain on your ride, so you can get back out there and conquer the trails with ease.

Preparing Your Bike for the Chain Swap

Before we dive into the nitty-gritty of the chain installation, it’s important to make sure your bike is ready for the task at hand. First and foremost, you’ll want to ensure that your bike is securely supported, either with a bike repair stand or by turning it upside down and resting it on the handlebars and saddle. This will give you the stability and access you need to work on the chain without the bike wobbling around.

Next, you’ll want to gather all the necessary tools for the job. At a minimum, you’ll need a chain tool, a pair of chain pliers, and a rag or two to keep your hands clean. Some additional tools that can come in handy include a bike multi-tool, a torque wrench, and a quick link for your specific chain type.

Measuring and Cutting the New Chain

Once you have your bike and tools ready to go, it’s time to measure and cut the new chain to the proper length. To do this, you’ll first need to determine the length of chain that your bike requires. This can vary depending on the size of your frame, the number of gears you have, and the type of suspension you’re running. As a general rule of thumb, you’ll want to measure the distance between the two rear derailleur pulleys when the suspension is fully extended, and then add around two to three inches to that measurement to account for the chain’s movement and any potential future adjustments.

With the proper chain length in mind, you can now use your chain tool to carefully remove the old chain and measure out the new one. Be sure to cut the chain to the appropriate length, leaving a little extra slack rather than cutting it too short. It’s always better to have a bit of extra chain than not enough!

Installing the New Chain

Now that you’ve got your new chain ready to go, it’s time to put it on your bike. Start by threading the chain through the rear derailleur, making sure it’s routed correctly and that the derailleur is in the smallest cog in the back. Then, feed the chain through the front chainring and around the bottom bracket, carefully aligning it with the rear cassette.

Once the chain is in place, use your chain tool to connect the two ends together, either with a quick link or by riveting the chain closed. Be sure to follow the manufacturer’s instructions closely, as the process can vary depending on the type of chain you’re using.

Adjusting the Chain Tension

With the chain installed, it’s time to make sure it’s properly tensioned. This is a crucial step, as an improperly tensioned chain can lead to all sorts of problems, from premature wear and tear to dropped chains and even damaged components. To adjust the tension, start by shifting the rear derailleur to the largest cog in the back, then pull the derailleur body back until there’s about an inch of play in the chain. This should give you the right amount of tension for optimal performance.

If you’re not sure about the proper tension, or if you’re dealing with a bike with a complex suspension system, it’s always a good idea to consult your bike’s owner’s manual or speak with a professional mechanic. They’ll be able to guide you through the process and ensure that your chain is dialed in just right.

Lubrication and Maintenance

Finally, don’t forget to give your new chain a good coating of bike-specific lubricant. This will help keep it running smoothly and reduce the risk of premature wear. Be sure to apply the lube evenly along the entire length of the chain, and wipe off any excess to prevent dirt and grime from accumulating.

With your chain properly installed, tensioned, and lubricated, you’re ready to hit the trails with confidence. Remember to check the chain regularly for signs of wear, and don’t hesitate to replace it if it’s starting to show its age. Taking good care of your bike’s chain is an essential part of maintaining a safe, smooth, and enjoyable riding experience.

Conclusion

Putting a new mountain bike chain on your ride may seem like a daunting task, but with the right tools, a little bit of patience, and the steps outlined in this guide, you’ll be back on the trails in no time. Remember to take your time, double-check your work, and don’t be afraid to ask for help if you’re unsure about anything. Happy riding, and may your chains stay firmly in place for many miles to come!

Frequently Asked Questions

How often should I replace my mountain bike chain?

As a general rule, you should replace your mountain bike chain every 1,000 to 2,000 miles, or whenever it starts to show significant wear and stretch. The exact timeline can vary depending on the conditions you ride in, the type of chain you’re using, and your riding style, so it’s a good idea to regularly check your chain’s condition and replace it as needed.

What’s the best way to measure chain wear?

The easiest way to measure chain wear is to use a dedicated chain wear tool, which you can find at most bike shops or online. These tools are designed to quickly and accurately measure the elongation of your chain links, allowing you to determine when it’s time for a replacement. You can also use a ruler to measure the length of 12 chain links – if it’s more than 12 1/8 inches, your chain is likely worn out and should be replaced.

Can I reuse a quick link when putting on a new chain?

It’s generally not recommended to reuse a quick link when installing a new chain. Quick links are designed for one-time use, and reusing them can compromise the integrity and reliability of the chain connection. It’s always best to use a new quick link to ensure a secure and long-lasting chain installation.

What’s the proper way to store a mountain bike chain?

When not in use, it’s best to store your mountain bike chain in a cool, dry place, away from direct sunlight and moisture. You can also apply a thin layer of bike-specific lubricant to the chain before storing it, which will help prevent rust and corrosion. Be sure to keep the chain clean and free of dirt and debris, as these can contribute to premature wear and tear.

Do I need special tools to install a mountain bike chain?

While you can technically install a mountain bike chain without any specialized tools, it’s highly recommended to use a dedicated chain tool to ensure a proper and secure connection. A chain tool allows you to easily remove and install the chain pins, which is a crucial step in the installation process. Additionally, having a pair of chain pliers on hand can make the job much easier and help you avoid potential finger injuries.