Gates belt cross reference charts match your old belt to a new one by part number or size

When your serpentine belt, timing belt, or V-belt wears out, you don't need to know the exact Gates part number to order a replacement. Gates publishes cross reference charts that let you look up a belt by its current part number — whether it's a Gates belt or made by another manufacturer — and find the matching Gates replacement. You can also cross reference by the belt's physical dimensions: length, width, and profile type.

The cross reference works in both directions. If you have an old belt with a competitor's part number stamped on it, you can find what Gates calls that same belt. If you know the Gates part number but need to find what another brand calls it, that information is there too. This matters because different manufacturers use different naming systems, and a belt that fits your engine might be labeled completely differently depending on who made it.

Key Takeaways

  • Gates cross reference charts are organized by belt type — serpentine, timing, V-belt, or wedge — so you need to know which kind you're replacing.
  • You can search by the part number printed on your old belt, by vehicle year and model, or by the belt's length and width measurements.
  • Gates publishes these charts on their website and through authorized distributors, and they're updated when new belt models are released.
  • Cross reference data shows you equivalent belts from Dayco, Bando, Continental, and other manufacturers, so you can compare prices or use what's in stock.

How to read a Gates cross reference chart

Gates cross reference charts are laid out in columns. The leftmost column shows the Gates part number. The next columns show equivalent part numbers from other manufacturers — typically Dayco, Bando, Continental, Goodyear, and Mitsuboshi. Some charts also include the belt's length in inches and its width in millimeters, so you can verify you're looking at the right belt before you buy.

To use the chart, find your current belt's part number in any column, then read across to the Gates column. That's your replacement. If your belt doesn't have a readable part number — because it's worn or faded — you can measure the belt's length and width and search the chart by those dimensions instead. Gates belts are typically labeled with length first (in inches) and width second (in millimeters), like "11A1000" for an 11-inch A-profile belt that's 1000 millimeters long.

Some cross reference charts are organized by vehicle make and model year instead of by part number. These are useful if you know what car the belt came from but the part number is illegible. You enter the year, make, and model, and the chart returns all the belt sizes that engine uses, along with their Gates equivalents.

Where to find Gates cross reference information

Gates publishes cross reference data on their official website under their technical resources section. You can read PDF charts for each belt type, or use their online lookup tool if you prefer to search by part number or vehicle. The online tool is faster if you're looking up a single belt, but the PDF charts are better if you're cross referencing multiple belts at once.

Authorized Gates distributors — including large automotive parts retailers and industrial supply houses — also stock printed cross reference guides and can look up equivalents for you over the phone. If you're buying from a local parts store, the staff can often cross reference your old belt while you wait, which saves you the step of looking it up yourself. Some retailers have the cross reference data in their point-of-sale system and can search it by part number or dimensions.

If you're working on a vehicle and the belt is still installed, you may be able to read the part number directly from the belt. Serpentine belts and timing belts usually have the part number molded or printed along the length. V-belts and wedge belts sometimes have it stamped on the side. Take a photo or write down the exact number, including any letters or dashes, because even a single digit wrong will point you to the wrong belt.

Cross referencing by belt type and dimensions

Gates makes several different belt profiles, and each has its own cross reference chart. The most common are serpentine belts (used for alternators, power steering, and air conditioning on modern engines), timing belts (which synchronize the crankshaft and camshaft), V-belts (the older wedge-shaped profile), and synchronous belts (which have teeth and are used in some industrial and specialty applications).

If you know the belt type but not the part number, you can cross reference by measuring the belt's length and width. Serpentine belt length is measured in inches and is usually between 30 and 200 inches. Width is measured in millimeters and is typically 6, 8, 10, 12, or 15 millimeters. Timing belt length is also in inches, and width varies by process. V-belts are labeled by a letter code (A, B, C, D, or E) that indicates the width, plus the length in inches.

When you measure a belt, measure the inside circumference if possible — that's the measurement that matters for fit. If the belt is still on the engine, you can measure the outside and subtract twice the belt thickness (usually about 0.5 inches for serpentine belts), but measuring the inside is more accurate. Write down the measurement to the nearest half inch, because belt sizes come in half-inch increments.

Understanding equivalent belts from different manufacturers

A Gates belt and a Dayco belt with the same dimensions are mechanically equivalent — they'll fit the same pulleys and do the same job. The difference is in the rubber compound, the reinforcement materials, and the manufacturing tolerances. Gates, Dayco, Bando, and Continental all make OEM-quality belts that meet or exceed the original equipment specifications for most vehicles.

The cross reference chart shows you which belts are true equivalents, meaning they have the same length, width, and profile. It does not mean all equivalent belts cost the same or last the same length of time. Some manufacturers' belts are priced higher because of brand reputation or because they use premium rubber compounds. Others are priced lower but still meet the same performance standards. The cross reference gives you the information to compare, but the choice of which brand to buy is yours.

One thing to watch: some cross reference charts show "near equivalent" belts that are close in size but not exact. These might be listed in a separate section or marked with a note. A near equivalent might work in a pinch, but it's not ideal for long-term use. Stick with the exact equivalent if you can find it in stock.

Common mistakes when using cross reference charts

The most common mistake is confusing belt length with belt width. Gates uses inches for length and millimeters for width, so a belt labeled "11A1000" is 11 inches long and 1000 millimeters wide — not 11 millimeters. If you reverse these, you'll order a belt that's far too small or too large. Always double-check the units before you order.

Another mistake is assuming that a belt with a similar part number is the same belt. Part numbers are sequential within a manufacturer's catalog, but they don't always follow a logical pattern. A belt numbered 11A1000 is not necessarily related to a belt numbered 11A1001. Always cross reference the exact part number, not a close approximation.

A third mistake is not accounting for belt wear when measuring an old belt. A worn serpentine belt can be slightly shorter than a new one because the rubber has compressed and the cords have stretched. If you're measuring a worn belt, add about 1 to 2 inches to your measurement to account for wear before you look it up in the chart. Better yet, if the old belt is still readable, use the part number instead of measuring.

When cross reference data might not be available

Very old belts — from vehicles made before the 1980s — might not appear in modern cross reference charts because those belt sizes are no longer in production. If you're restoring a classic car or working on vintage equipment, you may need to contact Gates directly or search specialty suppliers who stock obsolete belt sizes.

Specialty or custom belts made for specific industrial equipment might also not appear in standard cross reference charts. If you're working with a belt from a piece of machinery rather than a vehicle, check the equipment manufacturer's documentation first. They often have their own cross reference guides or can tell you the exact replacement part number.

If you can't find your belt in the cross reference chart, take a photo of the part number and contact Gates customer service or an authorized distributor. They can often look up belts that don't appear in the public charts, or they can help you identify what you have if the part number is partially worn away.

Frequently Asked Questions

Can I use a belt from a different manufacturer if the cross reference says it's equivalent?

Yes. Equivalent belts have the same dimensions and performance specifications, so they'll fit and function the same way. The choice between Gates, Dayco, Bando, or Continental is usually based on price, availability, and brand preference. All major manufacturers make belts that meet OEM standards.

What if my belt has no part number or it's too worn to read?

Measure the belt's length and width, and search the cross reference chart by those dimensions. If you know what vehicle or equipment the belt came from, you can also search by year and model. If neither works, contact Gates or a distributor with a photo of the belt and they can often identify it.

Do I need to cross reference if I'm buying a replacement from the same manufacturer?

No. If you have a Gates belt and you're buying another Gates belt, you can order by the part number directly. Cross reference is most useful when you're switching manufacturers or when you need to find out what a competitor's part number means in Gates terms.

Are near equivalent belts safe to use if the exact equivalent is out of stock?

Near equivalents are close in size but not exact, so they're not ideal for permanent installation. They might work temporarily, but you should replace them with the exact equivalent as soon as it's available. Using a belt that's slightly too long or too short can cause slippage or misalignment over time.

How often does Gates update their cross reference charts?

Gates updates their cross reference data when new belt models are released or when manufacturing changes occur. The online lookup tool is updated more frequently than printed charts. If you're using a printed chart that's more than a few years old, check the Gates website to make sure you have the current information.