Understanding Your 37-Inch Tires

37-inch tires are a significant investment for any Jeep owner, whether you tackle rock crawling, mud bogs, or desert trails. These large tires are engineered with robust rubber compounds, specialized tread patterns, and reinforced sidewalls to handle extreme loads and harsh terrain. The rubber often contains a mix of natural and synthetic polymers, carbon black for UV and abrasion resistance, and silica for better wet traction. Understanding these materials directly influences how you clean and protect them—harsh chemicals can strip essential oils, causing cracking or premature hardening.

Common tread patterns for 37‑inch Jeep tires include mud‑terrain (M/T) with deep, aggressive lugs for self‑cleaning in mud, and all‑terrain (A/T) patterns for balanced on‑road and off‑road use. Sidewall construction ranges from bias‑ply (less common on modern 37s) to radial, which provides better ride quality and longer tread life. Heavy‑duty sidewalls often feature extra rubber layers to resist punctures from rocks and stumps. When cleaning, pay special attention to the areas between large tread blocks—mud and debris can pack tightly and, if left to dry, can damage the rubber when driven over.

Essential Cleaning Supplies

Gathering the right tools saves time and prevents accidental damage. A good cleaning kit for 37‑inch tires should include:

  • Low‑pH or pH‑neutral tire cleaner – Acidic cleaners (often used for brake dust on wheels) can etch rubber. Off‑road specific cleaners are alkaline to break down mud and clay without harming the rubber.
  • Stiff‑bristle tire brush – A dedicated tread brush with long bristles reaches deep into the lugs. For sidewalls, use a softer brush or a wheel woolie to avoid scratching.
  • Soft‑bristle sidewall brush – Nylon or horsehair brushes are gentle on sidewall letters and rubber.
  • Pressure washer (optional) – A pressure washer with a rotating turbo nozzle can blast mud from deep treads, but avoid using a zero‑degree jet directly on sidewalls.
  • Microfiber towels (at least three) – Use one for drying, one for applying protectant, and one for buffing. Avoid cotton towels, which can leave lint.
  • Tire protectant/dressing – Water‑based protectants (often labeled “matte” or “natural”) are preferable to high‑gloss silicone dressings, which can attract dust and reduce traction. Look for UV inhibitors like paraffin or coconut‑oil derivatives.
  • Bucket and grit guard – Keeps your rinse water clean and prevents dirt from scratching.

Avoid using degreasers, bleach, or household cleaners—they can dry the rubber and degrade the tire’s structural integrity.

Step‑by‑Step Tire Cleaning Process

Follow this procedure for a deep clean that preserves rubber and enhances appearance.

1. Pre‑Rinse and Debris Removal

Start by hosing down each tire with a high‑pressure spray to knock off loose mud, gravel, and dust. Pay close attention to the space between tread blocks. If thick mud is stuck, use a plastic trim removal tool or a wooden stick to gently dislodge it before applying cleaner—scrubbing dry mud can scratch the rubber.

2. Apply Tire Cleaner

Spray the cleaner generously over the entire tire surface, including sidewalls and the inside of the tread. For mud‑caked tires, use a foam cannon with the recommended dilution ratio; foam clings longer, giving the chemistry more time to dissolve clay. Let it dwell for 2–5 minutes—longer if the dirt is stubborn, but do not let it dry completely.

3. Scrub Thoroughly

Using the stiff‑bristle tread brush, scrub in a back‑and‑forth motion along the grooves. Rotate the tire by moving the Jeep forward a few feet (if safe) to reach untouched areas. For sidewalls, switch to a softer brush and clean in vertical strokes to avoid micro‑marring. Do not forget the inner rim edge; dirt there can unbalance the tire.

4. Rinse Completely

Rinse with clean water from top to bottom, ensuring all cleaner residue is removed. Residue can attract dirt and accelerate weathering. A pressure washer is effective, but a garden hose with a trigger nozzle also works. Check between treads for any remaining dirt—if still dirty, repeat the cleaning step.

5. Dry Thoroughly

Use a clean microfiber towel to dry the tire. Water spots are not just cosmetic; minerals in hard water can promote rubber oxidation. Dry the sidewall and the face of the tread. If you plan to apply protectant, do it while the tire is still slightly damp (not wet)—this helps the dressing spread evenly.

6. Apply Tire Protectant

Shake the protectant well and apply it with a dedicated microfiber applicator pad or a sponge. Use a thin, even coat—too much product will sling off when driving. Let it cure for 5–10 minutes, then buff with a clean microfiber to remove excess. This step seals in moisture and provides UV protection, which is especially important for 37‑inch tires that spend lots of time in direct sunlight.

Remember to clean your wheels at the same time. Brake dust on wheels can transfer onto tire sidewalls and cause staining. Use a dedicated wheel cleaner for aluminum or steel wheels as needed.

Cleaning Frequency and Conditions

The right schedule depends on how you use your Jeep. Over‑cleaning can strip natural oils, while under‑cleaning allows damaging substances to accumulate.

  • After every off‑road trip: Mud contains acids from decaying organic matter, clay that hardens like concrete, and fine sand that can wear seals. Wash thoroughly as soon as possible—dried mud is much harder to remove.
  • Daily driving (pavement): Monthly cleaning is usually sufficient. In areas with road salt (winter) or heavy rain (standing water), increase frequency to twice a month to prevent salt corrosion and standing‑water grime.
  • Seasonal adjustments: In hot, arid climates, UV rays degrade rubber faster—add a UV protectant every 2–3 washes. In freezing climates, avoid cleaning when temperatures are below 40°F, as water can freeze in tread crevices and cause cracking.

Signs You Need to Clean More Often

  • Visible cracks or “browning” (oxidation) on sidewalls
  • Mud chunks falling off while driving
  • Loss of rubber luster or stickiness
  • Dust accumulation that doesn’t wash off easily

Beyond Cleaning – Additional Care Tips

Long‑term tire health involves more than cosmetic cleaning.

Maintain Proper Tire Pressure

37‑inch tires typically operate at 28–35 psi on pavement, but off‑road you may drop to 12–18 psi for flotation and traction. Check pressure at least once a week and always before long trips. Underinflation increases rolling resistance and sidewall flex, generating heat that can lead to blowouts. Overinflation wears the center tread quickly and reduces grip. Use a digital gauge for accuracy, and adjust according to load (e.g., when carrying heavy camping gear or towing).

Inspect for Damage

After every trail ride, visually inspect all four tires (including the spare) for cuts, sidewall bulges, punctures, and embedded rocks. Use a stiff pick or screwdriver to pry out stones that can drill into the tread under rotation. Check the tread depth with a gauge—37‑inch tires are considered worn at 6/32″ (3/16″) for mud‑terrain, or 4/32″ for all‑terrain. Uneven wear indicates alignment or suspension issues that should be corrected promptly.

Rotate Tires Regularly

Rotate your 37‑inch tires every 5,000–7,500 miles to equalize wear. On a Jeep with a full‑size spare, include the spare in a five‑tire rotation pattern to keep all tires at similar worn states. For directional tires (common on M/Ts), rotate front to back on the same side; for non‑directional, cross‑rotate in an X pattern. Balancing after rotation helps avoid vibrations.

Store Tires Properly

If you swap between summer and winter tires, or if your Jeep sits for months, store the unused tires in a cool, dry place away from direct sunlight, ozone sources (electric motors, furnaces), and chemicals. Lay them flat or stack them on their sides with cardboard between each to prevent flat‑spotting. Use tire bags or wrap them in heavy plastic to block UV. For short‑term storage (a few weeks), parking the Jeep on a concrete floor rather than blacktop prevents moisture wicking.

Also keep valve stems clean and consider using metal valve caps to prevent corrosion. When inflating, use a tire chuck with a gauge to avoid over‑filling. For ultimate protection, treat the rubber with a conditioner formulated for off‑road tires every 2–3 months.

Conclusion

Your Jeep’s 37‑inch tires are engineered for performance, but they demand regular, thoughtful care. By understanding the materials and construction, using the right cleaning tools and chemistry, and establishing a consistent maintenance routine—covering cleaning, pressure checks, inspections, rotation, and storage—you will maximize their lifespan and retain off‑road capability. Clean tires not only look great but also ensure that every adventure starts with a safe foundation. For further reading, check BFGoodrich’s official tire care guide, consult a tire pressure chart specific to your load range (e.g., TireSize.com pressure calculator), and explore product reviews for pH‑neutral tire cleaners to build your ideal kit. Regular attention today means many more miles of confident driving tomorrow.