Are Your RC Car Tires Too Hard? Here’s How To Soften Them

Last updated on April 12th, 2026 at 10:46 pm

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If your RC car tires feel too hard, you can often improve grip by cleaning them or treating them with a mild tire-softening compound. The biggest gain usually comes from making the rubber cleaner, tackier, and a little more pliable—not from permanently changing the tire.

That said, these methods are temporary and can wear tires out faster if you overdo them. The best approach is to start mild, test one tire first, and stop as soon as traction improves.

Best overall approach

The most practical way to deal with hard tires is to begin with a cleaner like Simple Green, then move to a light lubricant treatment only if you still need more grip. If the tires are old, cracked, or swollen, replacement is usually the better fix.

Method	Best for	Typical wait time	Main downside
Simple Green	Cleaning oil off the surface and restoring tackiness	Several hours to overnight	Can leave tires too sticky if used too strong
WD-40	Short-term pliability and a bit more grip	About 1 hour	Can attract dirt or soften too much if overused
Liquid Wrench	Quick traction boost before a run	About 30 minutes	Not meant for long soaking
PB Blaster	Another spray-on option with similar results	Varies	Less common, so results may vary

How to choose the right method

Pick the method based on what your tires need right now:

• Surface is oily or dirty: Start with Simple Green.
• You need a short-term grip boost: Try WD-40 or Liquid Wrench.
• You want to experiment with another spray: PB Blaster is a possible option.
• The tire is old, cracked, or swollen: Replace it instead of trying to revive it.

If you reach the point where softening no longer helps, a fresh set of tires may be the smarter move. Why And How To Change Your RC Car Tires? explains the replacement process and when it makes sense to swap them out.

WD-40

WD-40 is one of the most commonly used sprays for hard RC tires. The idea is simple: apply it evenly, let it sit for about an hour, and then run the car while the rubber is a little more pliable.

Some hobbyists wrap the tires in plastic wrap or place the car in a plastic bag so the product stays on the rubber longer. Warming the tires in the sun can also help the rubber absorb the treatment a little better.

This method can improve traction, but it is best used carefully. If you have a new set of tires, test one tire first before coating all four.

Simple Green

Simple Green is often used more as a cleaner than a true softener. It removes oil and grime from the tire surface, which can make the tire feel stickier and work better on the track.

You can spray it on or soak the tires overnight. If you soak them, a 50/50 mix with water is a safer starting point so the tires do not become overly tacky.

A toothbrush helps work the cleaner into the tire surface. After that, let the tires dry for several hours before driving.

Liquid Wrench

Liquid Wrench Lubricant Spray, especially the blue can, is another common option in the RC community. It works in a similar way to WD-40 and is usually applied shortly before driving.

Use it about 30 minutes before your run. It is not recommended for overnight soaking.

Some hobbyists mix it with equal parts non-chlorine brake cleaner to help it dry faster.

PB Blaster

PB Blaster is less common, but some RC drivers use it with good results. It behaves much like the other spray treatments and can be brushed in with a toothbrush to help it penetrate the rubber.

As with the other products, keep the application light at first. A little goes a long way, and too much can leave the tire overly soft or messy.

How to apply tire-softening products

These methods work best when the product is applied evenly. The goal is to coat the tire, not soak everything around it.

• Use a toothbrush to spread the product across the tire surface.
• Wrap the car or tires in plastic wrap or place them in a zip-top bag to slow evaporation.
• Leave the tires in the sun if you want the rubber to warm up while the treatment works.
• If you want faster drying, some hobbyists use equal parts brake cleaner with the chosen product.
• Try one tire first so you can compare the result before treating the full set.

Avoiding overspray and waste

Spraying directly can make a mess. A small pressure-release applicator, like an empty bingo stamper or detergent sponge, can help you place the product where you want it.

If you do not have one, drip the liquid onto the tires instead of spraying it across the workbench.

What to avoid

Softening RC tires is useful, but it is easy to go too far. Keep these cautions in mind:

• Do not soak tires too long. Some chemicals can swell rubber and make the tire unusable.
• Do not use too much product. Over-softened tires can become greasy and collect dirt, rocks, and dust.
• Work in a ventilated area. Many sprays are harsh and should be handled with care.
• Protect your hands and workspace. Gloves and a clean work area help prevent slips and spills.
• Keep chemicals away from children. Follow the manufacturer’s directions for storage and disposal.

Also remember that overspray can make floors slick. Clean up carefully after you are done.

When it is better to replace the tires

If the tires are cracked, swollen, or worn down, softening them is usually just a short-term bandage. Hardening, swelling, and chemical breakdown can all mean the tire is near the end of its useful life.

In that case, new tires will usually give you more consistent grip than any treatment. If your setup needs broader tuning, Upgrading Your RC Car Battery: Why, When and How may also help with overall performance, while Why Does An RC Car Battery Die So Fast? covers battery drain issues that can make a car feel less responsive.

More RC maintenance guides

• Are RC Vehicles Waterproof? for help with wet-running concerns
• How To Start A Nitro Engine After Storage for cars that sit for a while
• How Much Weight Can An RC Car Pull? for traction and load questions
• How Do I Build My Own RC Track? for setting up a surface that suits your tires

Frequently asked questions

Can RC car tires really be softened?

Yes, but usually only in a temporary way. Most methods make the tire surface cleaner, tackier, or slightly more pliable rather than permanently changing the rubber.

Is WD-40 safe to use on RC tires?

It can be used by hobbyists, but it should be applied carefully and in small amounts. Too much may attract dirt or damage the tire over time.

Should I soak my tires overnight?

Only with caution. Soaking can help in some cases, but leaving tires in chemical solutions for too long can swell or weaken the rubber.

What is the easiest method to start with?

Simple Green is a good first step because it cleans the tire surface and may restore grip without immediately exposing the tire to harsher treatment.

When should I stop trying to soften the tires?

If the tires are badly cracked, distorted, or still too hard after a mild treatment, replacement is usually the better option.

Final thoughts

Hard RC tires can often be improved with a cleaner or light spray treatment, but the best results usually come from a careful, test-one-first approach. Start mild, watch how the tire reacts, and replace the tires if the rubber is too far gone.

That way, you get better grip without wasting tires or creating a messy workbench.