How to Change a Cassette on Your Bicycle

What you need to do before you start

Changing a cassette means removing the stack of sprockets on your rear wheel and replacing it with a new one. You will need a cassette removal tool that matches your cassette brand (Shimano, SRAM, or Campagnolo), a chain whip to hold the cassette steady, and an adjustable wrench or socket wrench. Some people use a bench vise instead of a chain whip, which works just as well if you have one.

Before you buy a new cassette, check what you have now. The cassette sits on the right side of your rear wheel. Look at the smallest sprocket (the one closest to the wheel) and note the number of teeth, then look at the largest sprocket. A cassette marked 11-32 means the smallest has 11 teeth and the largest has 32. Your new cassette must match your drivetrain — a Shimano cassette will not work on a SRAM hub, and vice versa. It also has to match your number of speeds: an 11-speed cassette only works with an 11-speed chain and shifters.

Key Takeaways

You need a cassette removal tool, chain whip, and wrench — all three are essential, and the removal tool must match your cassette brand.
Your new cassette must have the same number of speeds as your current drivetrain and be made by the same manufacturer.
The cassette slides onto a threaded or splined hub; you remove it by turning the removal tool counterclockwise while the chain whip holds the cassette still.
After installing the new cassette, check that your derailleur limit screws still align correctly, because a different gear range may require adjustment.

Remove the rear wheel from the frame

Flip your bike upside down so it rests on the handlebars and seat, or use a bike stand. Open the quick-release lever on the rear axle (or unscrew the axle nuts if your bike has them) and pull the wheel out of the frame. You may need to shift to the smallest chainring and smallest sprocket first to give the chain slack.

Once the wheel is off, set it aside on a clean surface. Do not lay it flat on the cassette side, because the sprockets can bend. Lean it against a wall or rest it on the non-cassette side.

Position the cassette removal tool and chain whip

Hold the wheel upright with the cassette facing you. Slide the cassette removal tool onto the cassette — it will thread onto the center lockring (the largest ring at the hub end). The tool should sit flush and not wobble. If it does not fit, you have the wrong tool for your cassette brand.

Wrap the chain whip around one of the larger sprockets, near the outside of the cassette. The chain whip is a handle with a short length of chain attached; the chain loops around the sprocket and the handle gives you leverage. Position it so that when you pull the handle toward you, the chain will not slip off the sprocket.

Unscrew the lockring and slide off the cassette

Hold the chain whip handle steady with one hand. With the other hand, turn the cassette removal tool counterclockwise using your wrench. Turn slowly and steadily — do not jerk, because the tool can slip and strip the threads. As you turn, the lockring will loosen. After a few full rotations, you can unscrew the tool by hand.

Once the lockring is completely off, slide the cassette straight off the hub. The sprockets are stacked in order from smallest to largest, and they may stay together or come apart — either is normal. Set them down in the order they came off so you can see how they were arranged, in case you need to reference it.

Clean the hub and install the new cassette

Wipe the hub with a dry cloth to remove any dirt or old grease. Look at the hub itself — you will see either a threaded center (Shimano and SRAM) or a splined center (Campagnolo). Your new cassette must match this type.

Slide the new cassette onto the hub, smallest sprocket first. The sprockets will sit in the grooves or splines and should slide on smoothly. If you feel resistance, stop and check that you have the right cassette type for your hub. Once the cassette is fully seated, thread the lockring back on by hand, then tighten it with the removal tool, turning clockwise. Tighten firmly but do not over-tighten — you should feel solid resistance, not a grinding sensation.

Reinstall the wheel and check derailleur alignment

Slide the wheel back into the frame, making sure the chain sits on top of the cassette. Close the quick-release lever or tighten the axle nuts. Flip the bike right-side up and spin the wheel to make sure the cassette does not rub on the derailleur.

Shift through all the gears and listen for noise or grinding. If the derailleur does not reach the smallest or largest sprocket, or if it rubs on the chain, you may need to adjust the limit screws on the derailleur. These are usually marked H (high gear, smallest sprocket) and L (low gear, largest sprocket). Turn them a quarter-turn at a time until the derailleur sits centered over each sprocket. If your new cassette has a different tooth range than the old one — for example, you went from 11-28 to 11-32 — the derailleur may need more adjustment or even a new cable tension setting.

Frequently Asked Questions

Do I need to replace my chain when I replace my cassette?

Not always, but a worn chain will wear out a new cassette faster. If your chain is more than two years old or has been used with a worn cassette, replacing it at the same time is a good idea. A new chain costs less than a new cassette, so the total cost is still reasonable.

What if the cassette removal tool does not fit?

You have the wrong tool for your cassette brand. Shimano, SRAM, and Campagnolo all use different lockring designs. Check your cassette packaging or the manufacturer's website to confirm which tool you need, then buy the correct one. Using the wrong tool will strip the lockring and make the cassette impossible to remove.

Can I change a cassette without a chain whip?

A chain whip is the standard tool, but some people use a bench vise to clamp the wheel instead. You can also wrap a rag around a sprocket and hold it with pliers, though this is less stable. The goal is to keep the cassette from spinning while you unscrew the lockring. Without something holding it, you cannot generate enough force to loosen the lockring.

How tight should the lockring be?

Tight enough that it does not move when you shift under load, but not so tight that you strip the threads. Tighten until you feel solid resistance, then give it one more quarter-turn. If you over-tighten, you risk cracking the lockring or damaging the hub threads, which is expensive to repair.

My derailleur still rubs after I installed the new cassette. What do I do?

Check that the derailleur hanger (the metal piece the derailleur bolts to) is not bent. A bent hanger will cause rubbing no matter how you adjust the limit screws. If the hanger looks straight, adjust the limit screws one quarter-turn at a time until the rubbing stops. If your new cassette has a much larger or smaller largest sprocket than the old one, the derailleur cable may need re-tensioning.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.