An O-ring chain and an X-ring chain both seal grease inside the pins and rollers, so both last far longer than an unsealed standard chain. The difference is the shape of the seal. X-ring (also sold as quad-ring) designs touch the plates with less friction and are generally promoted as longer-lasting, while O-ring chains cost a bit less and work well on most street bikes.
For most riders, the right answer is a sealed chain that matches the bike's chain size and power, kept clean and lubed. Here is how the types compare and how to pick.
O-ring vs X-ring chain: the short version
| Feature | Standard (unsealed) | O-ring | X-ring (quad-ring) |
|---|---|---|---|
| Pin lubrication | Open, relies on outside lube | Sealed grease inside | Sealed grease inside |
| Seal shape | None | Round ring | Ring with an X cross-section |
| Friction | Lowest | Higher | Lower than O-ring |
| Expected life | Shortest | Long | Often rated a bit longer |
| Price | Lowest | Mid | Higher |
| Typical use | Racing, light bikes | Most street bikes | Higher power street and touring |
Treat the table as a general guide. Brand, build quality and how you treat the chain affect life more than the label.
How sealed chains work
A roller chain is a series of pins, bushings and rollers. In an unsealed chain the lube between the pin and bushing runs out, and dirt gets in. Most motorcycle chains run exposed, and they wear quickly compared to chains in other uses because they are exposed to dirt, water and heavy loads.
O-ring chains were developed in the early 1970s to hold lubricant inside the link and keep contamination out. A small rubber ring sits between the side plates, sealing the pin area.
That sealed grease is why an O-ring or X-ring chain can last many thousands of miles. It is also why you must not clean it with harsh solvents or a high-pressure washer pointed at the links, because they can attack the seals or force grit past them.
O-ring chains
An O-ring has a round cross-section. It presses against the inner and outer plates and seals the grease in.
Pros
- Long life compared to standard chains
- Good dirt and water protection
- Widely available and usually less expensive than X-ring
Cons
- More drag than an unsealed chain, because the rings squeeze against the plates
- Can create a small power loss on high-output bikes
- Seals can dry, crack or swell if neglected or cleaned with the wrong chemicals
O-ring chains are the standard sensible choice for most commuters, standard bikes and cruisers. If your bike came with one, you will not be disappointed to replace it with a quality equivalent.
X-ring chains
X-ring (or quad-ring) seals have an X-shaped cross-section. The idea is that the shape touches the plate in two lines instead of one wide band, which should reduce drag and help keep grease in. Some brands also keep a thin layer of lube between the contact points.
Pros
- Typically lower friction than a comparable O-ring chain
- Usually rated for longer life
- Better suited to high-power or heavily loaded bikes
Cons
- Costs more
- Not always a big improvement for light, low-mileage use
- Still needs proper cleaning and lubing
Brands name them differently, so a "ZX-ring" or "XW-ring" is a variation of the same idea, not a separate category. Read the manufacturer's description if you are choosing between lines.
What about standard chains?
Unsealed chains are lighter and have the least friction, which is why they appear in racing and on some small bikes. They need frequent lubrication and wear faster. For street riding, they are rarely worth the extra maintenance.
Which chain should I buy?
- Start with your bike's chain size. Common codes include 520, 525 and 530. The size must match your sprockets, and the number of links needs to fit your swingarm.
- Choose the type that fits your riding. For commuting and general street use, a good O-ring chain is fine. For a powerful sport bike, heavy touring or high mileage, an X-ring is a reasonable upgrade.
- Buy a quality brand and the right length. A cheap chain of unknown origin can stretch quickly, and a wrong length makes adjustment impossible.
- Replace the chain and sprockets as a set. A new chain on worn sprockets wears out quickly. Our guide to how to choose motorcycle sprockets covers tooth counts and wear.
- Pick the master link carefully. A clip-type link is easy and common. A rivet link is stronger and often recommended for high-power use, but needs a special tool.
If you are weighing a name brand against a cheaper one, our article on OEM vs aftermarket motorcycle parts explains where savings make sense.
Does the seal type matter for maintenance?
Both sealed types need care, and they need the same care.
- Clean with a soft brush and a cleaner that is safe for the seals, such as a chain cleaner labeled safe for O-ring and X-ring seals, or mild soap and water. Avoid gasoline, brake cleaner and harsh solvents.
- Lube every few hundred miles and after wet rides, and apply it to the rollers and seal area as the label says. Do it when the chain is warm and wipe off excess.
- Adjust slack to the figure in your owner's manual. Too tight accelerates wear on the chain, sprockets and bearings. Too loose can derail the chain.
- Inspect for stiff links, rusty or kinked sections and any damaged seals.
Step-by-step instructions are in our motorcycle chain maintenance guide.
How long do these chains last?
There is no single number. Sealed chains can last many thousands of miles when they are kept clean, lubed and adjusted, but real life depends on power, weight, riding style, weather and care. A chain that is stiff, rusty, has uneven slack or looks stretched is due for replacement regardless of mileage.
Signs of a worn drivetrain:
- A chain that will not stay adjusted, or you run out of adjustment range
- Hooked or shark-fin shaped sprocket teeth
- Rust, kinked or tight links
- Dry or damaged seals with visible grease leaking out
Cost
Costs vary by bike, region and shop. Parts for a chain alone often run somewhere around $60 to $250 depending on type and length, and a chain and sprocket set is usually more. Labor is often one to two hours. For a full breakdown, see the cost article on motorcycle chain and sprocket replacement.
When to see a mechanic
A broken chain can lock the rear wheel, damage the engine case or injure the rider, so chain problems deserve prompt attention. A shop that handles motorcycle maintenance can inspect the chain and sprockets, set the slack and align the wheel. If you are looking for one near you, start from motorcycle repair shops in Los Angeles or browse motorcycle repair by state.
Get help if:
- The chain has stiff or seized links
- You cannot adjust the slack to spec
- The sprocket teeth look hooked, chipped or uneven
- You are not sure the master link is installed correctly
- The chain is noisy, jumps or skips under load
Do not ride a bike with a chain you suspect is about to fail. Fix it first.
Frequently asked questions
Is an X-ring chain worth the extra money over an O-ring?
For most street riders the difference is modest. X-ring designs are generally marketed as lower friction and longer lasting, so they make the most sense on high-mileage or high-power bikes. Chain care matters more than seal shape.
Can I put an O-ring chain on a bike that came with an X-ring?
Usually yes if the pitch, width and link count match. Check the chain size stamped on the old one, and replace the sprockets at the same time.
Do O-ring and X-ring chains need lubrication?
Yes. The seals keep factory grease inside the pins, but the outside rollers, side plates and the seals themselves still need a suitable lube.
What do the numbers like 520, 525 and 530 mean?
They are the chain size code. The first digit gives the pitch in eighths of an inch (5 means 5/8 inch) and the last two digits indicate the roller width. Match the size your bike needs, and match your sprockets to it.
References
- Roller chain (Wikipedia): O-ring chains and motorcycle chain wear (en.wikipedia.org)