Trailer Tires, Sidewalls, Spare Tire & Wheel Safety Care

1. Locate the trailer certification information. Find the trailer manufacturer’s tire and loading label and the axle capacity listing. Record tire size, recommended cold inflation pressure, axle rating and wheel specifications.
2. Read the tire sidewall. Verify the installed tire size, construction/type, load range or load index, maximum pressure and applicable speed rating. Many boat trailers use ST-designated tires, but follow the actual trailer specifications.
3. Match the installed wheel. Confirm correct wheel diameter, width, bolt pattern, load rating and valve-stem rating for the tire and axle. A tire with enough capacity on the wrong wheel is still unsafe.
4. Account for the boat and gear. Consider the fully loaded boat, fuel, batteries, trailer and fishing equipment. Stay within all manufacturer gross and axle ratings; do not assume a spare or replacement tire raises capacity.
5. Confirm replacement specifications. Use the trailer and tire manufacturer guidance or a qualified tire shop for compatible tire, load capacity and inflation requirements. Record your verified tire specification for future service.

Important: Never choose replacement tire size, inflation pressure or wheel based only on appearance. Manufacturer load and wheel specifications control the choice.

1. Measure while tires are cold. Use a reliable pressure gauge before traveling, ideally after the trailer has been parked long enough for the tires to cool. Hot driving increases pressure.
2. Locate the proper cold pressure. Use the trailer certification label and applicable tire-maker guidance for the installed tire and load. The molded sidewall maximum is not automatically your operating pressure.
3. Check each tire individually. Record pressures for each installed trailer tire, even on tandem axles, and check the spare. Do not judge inflation solely by the look of the sidewall.
4. Inspect valve stems and caps. Look for cracks, tilted stems, missing caps and slow leaks. Use valves rated for the pressure and compatible with your wheel.
5. Correct and recheck. Adjust only to the verified cold inflation specification. If a tire repeatedly loses air or leaks at the stem, have it repaired before towing. Never bleed air out of hot tires simply to reach a cold target.

Important: Check pressure routinely and before trips. A damaged or underinflated tire can fail despite apparently usable tread.

1. Check both exposed and inward-facing sides. Park safely and use adequate light. Inspect accessible inner and outer tire sidewalls without getting beneath an unsupported trailer.
2. Look for immediate stop conditions. Do not tow on a tire with a bulge, visible cords, serious cut, separation or suspected structural damage. Have a tire professional evaluate punctures, impacts and pressure loss.
3. Inspect for aging and weathering. Cracking, hardening and prolonged sun exposure can damage tires even when tread appears deep. Read the DOT identification code and consult tire-maker replacement guidance.
4. Check after road impacts. A pothole or curb strike can damage the tire or wheel. Look for sidewall deformation, rim bends, rapid leakage and new vibration.
5. Protect during storage. Keep tires properly inflated, avoid petroleum-based cleaners and protect against unnecessary sun exposure during long storage. A spare ages even when never used.

Important: Do not try to patch, plug or inflate a tire with a bulge or exposed cord. Qualified tire service should decide safe repair versus replacement.

1. Inspect the full visible tread. Check for foreign objects, chunking, exposed cords, tread separation and shallow or uneven tread. Note any damaged areas before further travel.
2. Compare wear across the tread. A noticeably worn edge or center can indicate pressure, axle alignment, load or tire problems. Diagnose the cause; simply replacing the tire does not cure it.
3. Compare both sides of the trailer. Look for mismatched sizes or tire specifications and noticeably different tread wear. Consider axle and suspension condition when one tire differs significantly.
4. Check trailer loading. Keep the boat centered and secured on bunks. Stay within gross and axle weight limits and maintain appropriate tongue weight according to the trailer and tow vehicle manuals.
5. Have persistent problems examined. If uneven wear, pulling, vibration or abnormal heat repeats, have a qualified shop inspect tires, wheels, alignment and running gear rather than continuing to tow.

Important: This guide is for owner inspection, not axle alignment adjustment. Do not tow with exposed cord, bulges, structural separation or compromised tires.

1. Verify your spare actually fits. Check spare tire size and rating, wheel bolt pattern, rim capacity and cold pressure. Do not rely on an unverified spare mounted on the carrier.
2. Inspect the spare mount. Check carrier fasteners, rust, locking hardware and retention. The spare must not obstruct trailer lights, boat access, turning clearance or safety chains.
3. Carry the correct tools. Confirm your lug wrench fits, the jack has adequate capacity, and suitable wheel chocks and other maker-specified tools are present and functional.
4. Know safe lifting points. Review the trailer axle maker’s approved jacking instructions before a trip. Avoid unsafe road shoulders, slopes and unstable ground; never crawl under a trailer supported by a jack alone.
5. Plan for a roadside failure. Stop in a safe place. If the shoulder or lifting conditions are unsafe, request roadside assistance. Wheel mounting and lug torque must follow the trailer/wheel manufacturer’s instructions.

Important: Carrying a spare does not make it roadworthy. Never attempt a wheel change where passing traffic, soft ground or inadequate support creates serious risk.

1. Identify the trailer. Enter boat/trailer identification, tire size and load specification if known. Avoid guessing numbers that should come from the trailer label.
2. Record each tire check. Measure cold pressures and inspect tread, sidewalls, valve stems and visible wheels. Check the spare at the same time.
3. Note any abnormal condition. Mark the exact location for tread damage, bulges, cracking, pressure loss, wear or unsuitable replacements.
4. Flag unsafe issues for repair. Use OK, Monitor and Action on each line. Replace or professionally inspect tires with structural damage; do not tow until critical deficiencies are corrected.
5. Print and retain the form. Use the green Print This Inspection Form Only button immediately alongside the form heading. Use the red print button to print the whole page, including expanded details.

Important: This checklist complements, but never replaces, trailer and tire manufacturer instructions and professional inspection.