How to Change Your Ebike Chainrings

How to Change Your Ebike Chainrings

The process of installing a chainring on an ebike is very straightforward, but you must ensure the chainring you choose is the right size for your crank. When it comes to the Pitch Circle Diameter (PCD) of the mounting bolts, there are several different standards that you may find online.

In addition, many cranksets today have a specialized chainring that can only fit that particular model or brand of crankset. When you find the relevant component, practically all of them will fit together like the one below.

This is how to replace a chainring if it is too old, the wrong size, or needs to be cleaned.

You will need several tools and parts to do this.


Identifying the Sort of Chainring You Have:


Buying new chainrings and swapping them can be a complex process. If you're purchasing chainrings for a road or mountain bike, you'll find several bolt designs depending on whether you have a classic or compact drivetrain.

A "direct mount" chainring, for example, is mounted directly to the crankarm and is held in place by a sort of lockring; there are no external bolts. There are even ebikes that come with chainrings that are merged with the crankarm, in which case you will have to replace the whole unit when the chainring breaks.

The number of bolts that attach your chainrings to your bike, along with a measurement known as the bolt circle diameter, will indicate which chainrings you should purchase during chainring replacement (BCD). Ask your ebike technician to help you determine your BCD so that you can choose the right components.

The chainrings of your ebike are held to the crankset by a variety of bolts, and each nut and bolt combination requires a specific tool set to be installed properly.

It is nearly always necessary to use a chainring nut wrench, which is designed for a bolt with a slot in the middle known as a chainring nut. You will also need either a hex (Allen) wrench or a Torx wrench.


How to Change the Chainring on a Ebike?

You'll need the following tools: a 5mm Allen key, lubricant, and a torque wrench.


Taking Chainrings Off of a Ebike

To begin, select the appropriate tools (chainring nut wrench, hex or Torx wrench) that will fit the chainring nut on the outside of the chainring and the bolt on the rear side of the chainring. As soon as you have your wrenches in place, loosen the nut on the front of the bolt while maintaining the bolt in place on the rear of the bolt. After you have removed the chainrings completely, save the nuts and bolts for later use with the new chainrings. Put the chainrings over your crankarm, and you're done.



Step 1: Remove the chainset in the  

Check the crankshaft for the chainring bolts after you have removed the chainset (see our guide for instructions). They should be installed with a 5mm Allen key, and they should be screwed on quite firmly, so don't be surprised if they don't come off with a simple flick of the wrist.


Step 2: Take the bolts out of the nuts and bolts.

Turn the bolts in the opposite direction of the clockwise rotation of the Allen key (5mm) to undo them. Any of them that are mainly stuck can be easily freed with a short burst of penetrating spray.

Old-style cranksets in which the chainring bolts are not screwed directly into the spider may require a peg spanner to hold the rear of the nut and prevent it from twisting while it is being removed.



Step 3: Remove the rings from your fingers.

After removing the bolts and placing them to one side, you may either clean or replace the chainrings by removing them from their positions. The profile of the teeth of a chainring may tell you whether or not it needs to be replaced — if they are pointed like shark's fins, it is time to replace it.

It would help if you used a specific cleaner to clean it. Spray it with the cleaner, let it soak for a minute, and then scrub it down with a harsh brush.



Step 4: is clean and oil the bolts.

Cleaning the bolts with a degreaser is a good idea. Make sure to give them a new layer of good-quality oil before reinstalling them, and make sure to get some inside the boltholes as well!

That way, the bolts will be prevented from seizing up, but they will also be prevented from drying up, making your ebike less vulnerable to creaking and squeaking. It will also make it easy to eliminate them the next time you do this task.



Step 5: Check the chainring for damage.

Look for an alignment arrow on the chainring, which shows where the chainring should be aligned with the crankshaft. Otherwise, use the chain pip as a reference - this is the little grommet meant to prevent the chain from being trapped if it breaks loose from the main ring while wearing the necklace.

To use this, it must be positioned behind the crank.



Step 6: Put everything back together again. 

Finally, screw the bolts back in place and, using a torque wrench, make sure they are suitably tightened by listening for the torque wrench to click.

In addition to causing annoying clicking sounds around the bottom bracket, loose chainring bolts may also work loose over time. This is not a good thing!


Chainring Maintenance on a Ebike

Your chainrings may need to be thoroughly cleaned several times a year, depending on how often you ride your ebike. If you live near a beach where sand may enter your powertrain, or if you live in a damp area where rain regularly washes away your chain lubricant, causing your chain to rust, then you should pay closer attention to the condition of your entire drivetrain and transmission.

Leave a comment

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.