How to Measure Steering Cables: Measure Twice. Order Once.

Master Accurate Steering Cable Measurement for Smooth, Confident Handling

How to Measure Steering Cables: Measure Twice. Order Once. When it comes to replacing or installing a new boat steering cable, accuracy matters. Ordering the correct length ensures smooth handling and reliable steering response - so you can spend more time on the water and less time troubleshooting.

Follow this guide to measure your boat's steering cable correctly, whether you're replacing an existing one or starting fresh.

Replacing an Existing Steering Cable

If you're lucky enough to still have our old cable, start there.

1. Check for a Part Number: Look along the plastic jacket of your current cable. Most steering cables have a part number stmaped directly on the casing.
2. Use That Number: If it's stil llegible, you can use that part number to order an exact replacement - no measuring needed.

if your boat is older or steering has become stiff or inconsistent, it may be time for an upgrade. Read from Mechanical to Hydraulic Steering.

Measuring for a New Steering Cable Installation

If your system is new or the old cable number is unreadable, you'll need to measure the routing path manually.

Use our single station routing diagram below as a reference - it shows that standrad A, B, and C measurement points are used to determine proper cable length.

Measure Three Key Distances (see diagram):

• A: From the centerline of the steering wheel to the gunwale (or to the deck if routed downward)
• B: From the dash to the transom
• C: From the gunwale to the centerline of the engine connection (with the tiller arm centered)

For Cables Routed Through the Engine Tilt Tube:

• Add A + B + C + 6 inches, then round up to the next foot.
• Order that length cable.

For Cables Mounted to the Transom, Splashwell, or Stringer:

• • Add A + B + C - 6 inches, then round up to the next foot.

Tip: Even if your cable routing differs slightly (as with pontoons or custom setups), the same A-B-C method applies. Use the diagram as your guide to confirm each point along the cable's path before measuring.

Replacing Rack Steering Cables

If your boat uses a rack and pinion steering system, measure your existing cable's jacket, the "Y" dimension in the image below.

• Add 30 inches to that measurement and round up to the next foot to find your correct replacement length.

Replacing JBS Jet Boat Cables

For JBS jet boat steering systems (such as Mercury Sport Jet or OMC Turbo Jet models):

• Measure the entire cable length from tip to tip.
• Round up to the next foor if needed
• Then order that length

Note: JBS helms are designed only for smaller jet setups. If your jet steering system looks different, contact Dometic Mechanical Technical Service at 610-495-7011 for assistance.

Typical Single-Station Routing

Most single-station, starboard drive setups use a push-pull mechanical cable system. While this routing works for many boats, cable paths may vary - especially on pontoons.

If your setup differs, you can lay a garden hose or flexible measuring tape along the intended routing path to get an accurate measurement from the steering wheel to the engine connection.

Final Measurement Tips

• Double-check before ordering - a small error can lead to a cable that's too short or with excess slack.
• Round up - it's better to have a slightly longer cable than one that won't reach.
• Ask for help - contact U.S. Boating & Marine Supplies or your manufacturer’s support team if you're unsure.

Frequently Asked Questions About Measuring Steering Cables

Can I use my old steering cable as a reference for a new one?

Yes. If it has a readable part number, you can order an exact replacement without measuring.

What if my old steering cable doesn't have a part number?

Measure manually using the A-B-C method shown in this guide and round up to the nearest foot.

Do I need to measure differently for hydraulic systems?

No. Hydraulic systems use hoses instead of cables, but you'll still measure distance from the helm to the transom to ensure proper fit.

What happens if I order the wrong cable length?

A cable that's too short won't fit properly, while one that's too long can cause slack and reduced responsiveness. Always double-check measurements before ordering.