The Significant Drawbacks of Wheel Spin and How to Prevent Them

Whether it‘s unintentional slipping on a wet road or showboating at a stoplight, wheel spin can be thrilling. But while kicking up smoke and howling tires looks cool, it can seriously hamper your car‘s performance and safety. In this in-depth guide, you‘ll learn all about wheel spin, the hidden damage it causes, and pro tips to keep your ride under control.

A Slippery Slope: The Physics of Wheel Spin

Before jumping into the downsides, let‘s break down what exactly causes wheels to spin in the first place. It all comes down to physics – when the forces driving the wheels exceed the available grip at the tires‘ contact patch, slippage occurs.

The driving forces come primarily from the engine torque transmitted through the drivetrain. This twisting force at the wheels is opposed by friction between the tires and road surface. Friction depends on the coefficient of friction between the two surfaces and the normal force pressing them together.

When the driving force overpowers friction, the wheels will spin faster than the true speed of the vehicle. Newton‘s equations show the acceleration directly depends on the net force divided by mass. Since the driven wheels have relatively low mass, it doesn‘t take much imbalance between drive and friction forces to induce rapid spinning.

Wheel spin results when driving force exceeds friction force

For example, say you floor the gas pedal from a stop. The engine revs up and applies 500 lb-ft of torque through the transmission to the rear wheels. But the coefficient of friction between your tires and the road is only 0.7, meaning the max friction force is only 3,500 lbs of resistance per wheel. The driving force overwhelms theavailable grip, and the wheels break traction and spin.

The Cost of Wheel Spin: Rapid Tire Wear

We‘ve all seen lurid burnout videos or laughed at cartoons where a driver peels out and leaves a smoking pair of melted tires behind. Amusing as it may look, the reality is profoundly destructive for your actual tires.

Studies by tire manufacturers have found intense heat cycles and forces imposed by spinning tires literally tear the rubber apart. Analysis of tread depth after controlled wheel spin shows wear rates can be 5-10 times higher than normal driving [1]. Let‘s look at exactly what happens:

• Overheating – Friction converts the kinetic energy of spin into heat. Temps exceeding 300°F can soften and melt the rubber [2].
• Irregular Wear – With the wheel rotating faster than the car is moving, the tire scrubbing action grinds tread down unevenly.
• Chunking – Heat/cool cycles harden the tread rubber, causing it to separate and tear off in chunks.
• Cording – Extreme heat de-laminates and separates the steel belts under the tread into sharp cords.

These effects are amplified when spinning tires at speed rather than from a standstill. Even brief wheel spin on pavement rapidly degrades performance and shortens the lifespan of your tires.

Collateral Damage: Drivetrain Components Also Suffer

In addition to rubber meeting the road, excessive wheel spin takes a toll on internal drivetrain components including:

• Differential – Attempts to compensate for the speed difference between spinning and stationary wheels. The gear lash and friction forces accelerate wear of the ring/pinion gears and bearings.
• Axle shafts – The spider gears transferring torque between wheels induce oscillating torque spikes in the axle shafts. Fatigue life is reduced under these higher load cycles.
• Transmission – Rapid engaging/disengaging of gears during traction loss creates harsher shifts and greater stress on gears, shafts and bearings.
• Clutch – Frequent slip between the clutch disk and flywheel damages the friction material and glazing of the surfaces.

Durability testing has shown certain drivetrain components can experience 2-3X higher wear rates under sustained wheel spin conditions [3]. The additional heat also degrades lubricants more quickly. While designed to withstand some slippage, excessive traction loss will take its toll.

Spinning Out: Why Wheel Spin Won‘t Help You Get Unstuck

You‘re stuck. Mired in a snowbank or rutted mudhole. The natural instinct is to aggressively spin the tires in an attempt to power out. But counterintuitively, this only makes matters worse by:

• Digging away at the ground and sinking your tires in deeper
• Packing the surrounding area tighter around your tires
• Accelerating melt of snow into slippery ice

With limited traction available, gentle, steady throttle input is required to gradually climb out without worsening conditions. Patience and minimal wheel spin is key.

Pro Tip: Momentarily engaging 4WD or a locking differential can help equally distribute torque and minimize spinning of a single wheel.

Brake Damage from Lockup

Hard braking that induces wheel lockup also qualifies as uncontrolled wheel spin. And like acceleration slip, it can damage components:

• Overheated brake fluid boiling in the lines
• Brake fade as friction surfaces reach extreme temps
• Uneven rotor and pad wear as contact patches shift
• Increased stopping distances

ABS prevents lockup during emergency braking. But the system can‘t eliminate these effects entirely, especially with worn pads or defective hydraulics. Maintaining your brakes is critical for avoiding spin during deceleration.

The Dangers of Wheel Spin: Loss of Control

Beyond mechanical damage, excessive wheel spin seriously degrades vehicle control:

• Diminished steering capability as directional grip is lost
• Increased risk of spinouts or rollovers as traction limits are exceeded
• Oversteer tendencies amplified during cornering
• Stability control systems hampered by unpredictable traction levels

Statistics show winter accidents due to loss of control jump by 15-50% compared to dry pavement [4]. Remaining smooth and avoiding panic reactions will give you the best shot at recovering from wheel spin unscathed.

Techniques to Recover from Wheel Spin

While avoiding wheel spin entirely isn‘t realistic, here are some tips to mitigate it:

• Accelerate gradually, especially on low traction surfaces
• Shift up earlier and use lower RPMs when accelerating
• Avoid abrupt throttle changes mid-corner
• If oversteer occurs, steer smoothly into the skid
• If understeer occurs, lift off the throttle to regain steering grip
• When stuck, carefully "rock" the car to escape instead of spinning wheels
• Engage 4WD or AWD for maximum traction
• Switch on traction control to prevent uncontrolled slippage
• Install winter tires for extra grip on ice and snow

With restraint on the pedals, active countersteering, and driver aids like ABS and stability control, you can stay on top of wheel spin and regain control quickly.

Performance Standpoint: Harnessing Wheel Spin

While generally hazardous on public roads, controlled wheel spin has specialized uses:

• Drag racing relies on precisely spinning rear tires to maximize launch grip
• Drifting induces oversteer slip angles for motorsport maneuvering
• Left-foot braking uses light rear brake to transfer weight and prime the tires

In performance contexts, brief slip can be carefully leveraged for quicker acceleration, sharper cornering, and greater control. But sustained burnouts still overheat components. It‘s a delicate balance.

Drivetrain Differences: Where‘s the Spin?

Depending on your vehicle‘s drivetrain layout, wheel spin may be prone to occur at either the front or rear:

• Front-wheel drive – Understeer when traction limits are exceeded
• Rear-wheel drive – Oversteer upon hitting traction limits
• All-wheel drive – Power is distributed to all wheels, minimizing spin

For front-heavy vehicles like sedans, front tire slip induces understeer. Lighter rear-drive sports cars tend to oversteer when engine power overwhelms rear grip. AWD systems actively shift torque between axles to maintain control.

Electric Torque on Tap: Wheel Spin in EVs

The instantaneous torque output of electric motors provides neck-snapping acceleration. But drivers must respect the power or spinning wheels will result:

• Maximum torque from 0 RPM demands smooth pedal modulation
• RWD torque bias in Teslas requires care when accelerating
• Torque vectoring provides electronic traction optimization

While EVs don‘t rev like gas engines, their seamless torque flow enables eye-blink speed – and wheel spin if you‘re not judicious with the "gas."

Summing Up Wheel Spin

While it certainly looks cool in the movies, uncontrolled wheel spin leads to premature tire and drivetrain wear, reduced vehicle control, and increased accident risk. With responsible driving habits, modern traction aids, and proper tires, you can have fun out there while keeping excessive slip safely in check. Use the techniques we‘ve covered to mitigate spin, and your car – and wallet – will thank you.

Sources:
[1] Goodyear Tire Test Report GO-89-054
[2] Bosch Automotive Handbook, 27th Edition
[3] Exxon Mobil – Managing Increased Drivetrain Loads White Paper
[4] NHTSA – Weather and Road Safety Factors Report