What Are the Types of Crossbow Strings?

Does your bow need just a string or cables too?

Look at your crossbow limbs to see how the bow is shaped. The overall mechanical layout determines whether you need a single shooting string or a three-piece rigging set.

If your bow has plain, curved limbs with no wheels on the tips, you own a recurve crossbow. Recurve setups use only one main shooting string that loops directly over the limb tips. Because there are no moving wheels or secondary lines, maintaining a recurve is straightforward. You only ever need to buy and replace that single main string.

If your bow has wheels or egg-shaped cams on the limb tips, you own a compound crossbow. A cam is the rotating wheel on a compound bow tip that helps generate speed and reduces cocking tension. Compound bows cannot operate with just a shooting string. They rely on buss cables, which are the harness cables turning the cams during the draw cycle.

These harness cables anchor to the cam axles and crisscross beneath the arrow rail. When you pull the main string back, the cables roll up onto the cams, bending the limbs inward. If you hunt with a modern high-power setup, such as the best TenPoint crossbow for hunting, your gear relies on this exact cam-and-cable system.

Whenever you service a compound bow, treat the string and cables as a matched family. Changing only the shooting string while leaving stretched harness cables in place creates uneven tension. This imbalance knocks the cams out of sync, ruins arrow accuracy, and places dangerous side-load forces on your limb tips.

What fibers make up different crossbow strings?

Crossbow strings are made from two main material categories: traditional low-stretch polyester and modern ultra-strong synthetic fibers.

The most common traditional polyester material is Dacron, a standard low-stretch polyester fiber that has served archers for decades. Dacron has a gentle, built-in stretch under load. When you release the trigger, that slight stretch acts like a tiny shock absorber. It cushions the sudden stop of the limbs at the end of the stroke. Traditional recurve crossbows with wooden or molded limbs rely on that cushion to keep from cracking.

Modern crossbows use rigid synthetic fibers, often known as Fast Flight or high-modulus polyethylene blends. Fast Flight is a rigid modern synthetic fiber engineered to hold immense tension without stretching. Because these fibers do not stretch when fired, they transfer nearly all stored limb energy directly into the arrow, creating flatter trajectories and faster speeds.

Zero-stretch synthetics transfer huge amounts of shock directly back into the bow frame. If you shoot a high-performance model like a compact hunting crossbow, the reinforced limbs and heavy-duty cams are built specifically to absorb that violent snap.

The danger comes from putting rigid modern synthetics on a bow not built for them. If you install a Fast Flight string on an older recurve made for Dacron, the lack of stretch acts like a hammer blow against the limb tips. The tips can split or shatter upon release.

Why do crossbow strings have protective thread wrappings?

Look closely at any crossbow string, and you will notice that the bare strands are only visible in a few open sections. Most high-friction areas are tightly wound with a fine, durable thread called serving.

The center serving is the protective thread wrapped around the string middle where your arrow rests. This small section takes the worst punishment on the entire bow. When you cock the crossbow, the metal trigger claw bites directly into the center serving. The nock of your arrow rests against it, and cocking hooks drag across it under heavy pressure.

When you fire, the center serving slams forward, sliding directly across the arrow rail. If that area had bare string strands, the heat and friction would saw through the load-bearing fibers in just a few dozen shots. The center serving acts like an armor plate, taking all the friction so the internal fibers remain safe.

You will also find servings on the end loops. End loop servings protect the string eyes where they wrap around the limb tips or cam posts, preventing sharp metal channels from cutting into the strands.

Caring for these thread wraps is simple. Apply unscented string wax to the exposed fiber strands to prevent fraying. Keep heavy wax off the center serving, using a light liquid rail lubricant instead so dirt does not gum up the trigger box.

How do you find the right string for your bow?

Crossbow rigging cannot be guessed based on visual estimates. Follow this practical checklist to get the exact fit:

• Check the manufacturer specification label: Look on the inside face of the bottom limb or along the side of the barrel. Most builders print the exact string length and cable length in inches right on the bow frame.
• Confirm the exact bow model name and year: Bow makers update limb geometry and cam sizes from season to season. Even if two bows share a similar name, changes to wheel-to-wheel length (the distance between cam axles) or grip-to-string distance (the gap between the grip and the uncocked string) require different string lengths.
• Verify the fiber type approved for your limbs: Read the manual to check whether your limb tips support modern synthetic fibers or require standard polyester. Putting zero-stretch synthetics on an older recurve can break the limbs, while putting polyester on a modern compound bow causes severe stretching.
• Match the serving thickness to your trigger latch: Different trigger boxes require specific string diameters. If a replacement string has a center serving that is too thick, it will jam in the trigger mechanism; if it is too thin, the trigger catch may slip.
• Never use vertical compound bow strings: Vertical bows operate with pull weights (how much effort it takes to pull the string back) between 50 and 70 pounds. Crossbows routinely hold 150 to over 200 pounds of pull weight. Crossbow strings require far more strand bundles and heavier servings to handle that force.

When is an old crossbow string unsafe to shoot?

Crossbow strings sit under heavy tension even when resting, and that tension spikes when cocked. A failing string can snap with explosive force, splintering limbs and flinging sharp fragments toward your face.

Inspect your bow before every shooting session by running through these safety checks:

• Look for severed or frayed internal strands: Check the exposed fiber bundles. If you see light fuzziness, wax will smooth it down. But if even one individual strand is cut or snapped, stop shooting immediately.
• Inspect the center serving for separation: Look where the trigger claw grabs the center serving. If the wrapping thread separates and exposes bare strands beneath it, the string must be replaced before shooting again.
• Check the end loops and cam grooves: Examine the loops hooked over the limb tips or cam posts for thread wear caused by friction against metal channels.
• Watch for excessive string stretch: Stretched harness cables cause compound cams to fall out of time, which ruins arrow flight. If your string has stretched past the timing marks on your cams, replace the entire set.
• Retire the string immediately after any dry fire: A dry fire means firing the bow without an arrow nocked. Without an arrow to absorb the energy, violent shock shatters the internal fiber bonds, making the string unsafe even if it looks normal outside.

If your compound bow needs new rigging, take it to an archery pro shop. Changing compound strings requires a specialized archery pro shop bow press designed for high limb pressure. Never compress compound limbs with workshop clamps, which can slip and cause severe injury.

FAQs

Can you put Fast Flight strings on any recurve bow?

No, you should never install Fast Flight or other zero-stretch synthetic strings on an older recurve crossbow unless the manufacturer explicitly approves it. Older recurves with plain limb tips rely on the natural stretch of Dacron polyester strings to cushion the shock of the shot. Installing a rigid synthetic string on an unrated recurve will send violent shockwaves through the limbs, frequently splitting the limb tips.

How long does a crossbow string usually last?

A crossbow string typically lasts about one to two years, or around 100 to 200 shots, depending on maintenance. High-power compound bows put heavy friction on strings and cables, requiring more frequent changes than light recurves. Even if you shoot rarely, replace your rigging every two to three years because synthetic fibers break down over time from tension and humidity.

Can you change compound crossbow cables at home?

You should not change compound crossbow strings or harness cables at home unless you own a bow press built specifically for crossbows. Crossbow limbs hold massive tension that standard workshop clamps cannot hold safely. Slipping tools can shatter limbs, bend cam axles, or cause violent injuries. Take your bow to an archery pro shop where technicians can press the limbs safely and sync the cams.

What happens if your crossbow string snaps?

If a crossbow string snaps while cocked or during a shot, the bow experiences the equivalent of a catastrophic dry fire. The stored energy slams back into the limbs, cams, and riser instead of the arrow. This sudden shock can shatter the limbs, warp cam axles, and fling sharp fragments. Inspect your string regularly and replace it at the first sign of wear.