Why Your C8 Corvette Tires Are Rubbing (And How to Fix It)

How to Fix Rear Issues

Experiencing rear-related problems with your 2020 Chevrolet Corvette can be frustrating. From unusual noises to uneven tire wear, these issues can impact your driving experience and potentially lead to more significant problems if left unaddressed. "My problem was the rear rivit became loose on the drivers side," shared one owner, highlighting a specific rear issue they encountered. This guide will help you diagnose and address common rear concerns specific to the 2020 Chevrolet Corvette, based on real owner experiences and reported solutions.

Symptoms

Owners of the 2020 Chevrolet Corvette have reported several symptoms related to rear issues. One common concern is "poke," which likely refers to the rear wheels extending too far outward from the fender, potentially causing an undesirable aesthetic or even rubbing against the body. This is often observed after modifications, such as installing aftermarket wheels or suspension components.

Another frequently mentioned symptom is "rub," indicating that the tires are making contact with some part of the vehicle's body, usually the fender or inner wheel well. This rubbing can occur during normal driving, especially when turning or going over bumps. Owners note this can be caused by several factors, including incorrect wheel offset, tire size, or ride height adjustments. Rubbing not only damages the tires but can also affect the vehicle's handling and safety.

Tire-related problems, such as uneven wear, are also a significant indicator of rear issues. Owners have noted uneven wear patterns on the rear tires, which can be a sign of misalignment, incorrect camber settings, or suspension problems. Addressing tire wear promptly can prevent premature tire failure and ensure optimal performance.

Furthermore, some owners have reported issues with the rear suspension, such as noises or a feeling of instability. These symptoms can indicate worn-out bushings, damaged shocks, or other suspension components. Addressing these issues promptly is essential to maintain the vehicle's handling and safety.

Most Likely Cause

Based on owner data, a primary cause contributing to rear-related issues in the 2020 Chevrolet Corvette is an intake leak. While seemingly unrelated to the rear, an intake leak can cause the engine to run improperly, which may lead to uneven power delivery, vibrations, and other issues that manifest as symptoms in the rear of the vehicle. An engine not running smoothly can cause unusual stresses on the drivetrain and suspension, which can exacerbate any existing weaknesses or alignment issues in the rear.

An intake leak allows unmetered air into the engine, disrupting the air-fuel mixture. This can cause the engine to run lean, potentially leading to misfires, reduced power, and increased fuel consumption. The engine control unit (ECU) may try to compensate for the lean condition by adjusting fuel delivery, which can cause further imbalances and contribute to vibrations and uneven performance.

The vibrations and uneven power delivery caused by an intake leak can transmit through the drivetrain to the rear of the vehicle, potentially causing unusual noises, instability, or uneven tire wear. Additionally, the stress on the drivetrain components can exacerbate any existing alignment or suspension issues, leading to symptoms like "poke" or "rub" if the rear wheels are not properly aligned or if the suspension is not functioning correctly.

Therefore, while other factors like wheel offset, tire size, and suspension condition are important to consider, an intake leak should be ruled out as a potential underlying cause of rear-related issues in the 2020 Chevrolet Corvette. Addressing the intake leak can help ensure the engine runs smoothly and reduce the stresses on the drivetrain and suspension, ultimately improving the vehicle's overall performance and handling.

How to Diagnose

Diagnosing rear-related issues in your 2020 Chevrolet Corvette requires a systematic approach. Here's a step-by-step process:

1. Visual Inspection: Begin by visually inspecting the rear tires for signs of uneven wear, such as excessive wear on the inside or outside edges. Look for any bulges, cuts, or other damage to the tires. Check the wheel wells for signs of rubbing, such as worn paint or plastic.

2. Wheel and Tire Assessment: Examine the wheels for proper fitment and alignment. Ensure that the wheels are hub-centric or use adapters to ensure they are correctly centered on the hub. As one owner pointed out: "Did you make sure to use hub-centric wheels, or adapters to make them hub centric? Is there a chance that the wheel is not aligned correctly on the hub?" (source) Verify that the tire size and wheel offset are appropriate for your vehicle.

3. Suspension Inspection: Inspect the rear suspension components for signs of wear or damage. Check the shocks, springs, bushings, and control arms for leaks, cracks, or excessive play. Pay close attention to the bushings, as worn bushings can cause instability and uneven tire wear.

4. Alignment Check: Have the rear alignment checked by a professional. Misalignment can cause uneven tire wear and affect the vehicle's handling. Ensure that the camber, toe, and caster angles are within the factory specifications.

5. Intake Leak Test: Check for potential intake leaks. With the engine idling, listen for any unusual noises, such as hissing or whistling, near the intake manifold. You can also use a smoke machine to introduce smoke into the intake system and look for leaks. Alternatively, spray carburetor cleaner or starting fluid around the intake manifold and listen for changes in the engine's idle speed. If the idle speed increases, it indicates an intake leak.

6. Noise Isolation: If you are experiencing unusual noises from the rear of the vehicle, try to isolate the source of the noise. Drive the vehicle on a smooth road and listen for any unusual sounds. Pay attention to when the noise occurs, such as during acceleration, braking, or turning.

Tools Required:

• Jack and jack stands
• Lug wrench
• Torque wrench
• Inspection light
• Pry bar
• Socket set
• Wrench set
• Smoke machine (optional)
• Carburetor cleaner or starting fluid

Step-by-Step Fix

Addressing rear issues in your 2020 Chevrolet Corvette requires a targeted approach based on the diagnosed problem. Here's a step-by-step guide covering common fixes:

1. Address Intake Leak: If an intake leak is suspected, locate and repair the source of the leak. This may involve replacing a worn or damaged intake manifold gasket, tightening loose bolts, or replacing cracked hoses. Ensure that all connections are properly sealed to prevent further leaks.

2. Correct Wheel and Tire Fitment: If the wheels and tires are causing rubbing or poke, correct the fitment by installing wheels with the appropriate offset and tire size. Consider using hub-centric rings or adapters to ensure that the wheels are properly centered on the hub. Ensure that the tires are properly inflated to the recommended pressure.

3. Replace Worn Suspension Components: If any suspension components are worn or damaged, replace them with new parts. This may involve replacing shocks, springs, bushings, or control arms. When replacing bushings, use a press or bushing removal tool to ensure proper installation. "To replace control arm bushings requires complete disassembly. During reassembly replace ball joints tie rod ends etc . in my case after front end rebuil car is still “squarely”," noted one owner, highlighting the importance of thoroughness. (source)

4. Adjust Alignment: If the rear alignment is out of specification, have it adjusted by a professional alignment shop. Ensure that the camber, toe, and caster angles are within the factory specifications. Properly aligned wheels and tires will improve handling, reduce tire wear, and prevent rubbing.

5. Repair Loose Rivets (if applicable): In cases where a loose rivet is identified, as mentioned by one owner, use a suitable adhesive, such as JBWeld, to reposition and secure the rivet. "Again once you establish which stem post is loose, JBWeld worked like a charm to reposition the loose stem in a forward position to fully extend the hinge so the tonneau cover clears the front bow," shared CSixDude. (source Allow the adhesive to fully cure before driving the vehicle.

6. Install New Brake Lines (if applicable): If corrosion or damage has affected the brake lines, prioritize replacing them. This ensures reliable braking performance. As one owner shared: "Last night I worked on bending and installing new brake lines. Really wish GM had corrected the brake line routing after they moved away from the rear mounted ABS module!" (source

Parts and Tools Needed

• Intake manifold gasket (Part number varies depending on engine type)
• Hub-centric rings or adapters (if needed)
• Shocks (Part number varies depending on model and suspension type)
• Springs (Part number varies depending on model and suspension type)
• Bushings (Part number varies depending on suspension type)
• Control arms (Part number varies depending on model and suspension type)
• Alignment shims (if needed)
• Jack and jack stands
• Lug wrench
• Torque wrench
• Inspection light
• Pry bar
• Socket set
• Wrench set
• Smoke machine (optional)
• Carburetor cleaner or starting fluid
• Bushing removal tool or press (for bushing replacement)
• JBWeld (for loose rivet repair)
• New brake lines (if applicable)

Real Owner Costs

The costs associated with addressing rear issues in your 2020 Chevrolet Corvette can vary widely depending on the nature of the problem and whether you choose to perform the repairs yourself or take it to a professional mechanic. Here are some examples of real owner costs:

• Intake Leak Repair: DIY repair of an intake leak can cost around $50 to $200 for parts, such as a new intake manifold gasket and replacement hoses. A professional repair can cost between $300 and $800, depending on the complexity of the job and the shop's labor rate.

• Wheel and Tire Fitment Correction: Correcting wheel and tire fitment can range from $50 for hub-centric rings to several hundred dollars for new wheels and tires. Professional installation of new wheels and tires can cost between $50 and $200.

• Suspension Component Replacement: Replacing worn suspension components can cost anywhere from $100 to $500 per component, depending on the part and the brand. Professional installation can add an additional $100 to $300 per component. For example, replacing shocks and springs on both rear wheels can cost between $400 and $1600, including parts and labor.

• Alignment: A professional alignment typically costs between $80 and $200.

• Loose Rivet Repair: Repairing a loose rivet using JBWeld is a relatively inexpensive fix, with the cost of materials being around $10 to $30.

• Brake Line Replacement: New brake lines can range from $50-$150, with labor potentially adding another $200-$400, depending on the complexity.

DIY repairs can save you money on labor costs, but they require mechanical knowledge, the right tools, and time. If you are not comfortable performing the repairs yourself, it is best to take your vehicle to a professional mechanic.

Prevention

Preventing rear issues in your 2020 Chevrolet Corvette involves regular maintenance, careful driving habits, and prompt attention to any warning signs. Here are some tips to help prevent rear problems:

• Regular Tire Maintenance: Check your tire pressure regularly and inflate your tires to the recommended pressure. Rotate your tires every 6,000 to 8,000 miles to ensure even wear. Have your tires balanced and aligned as needed.

• Suspension Inspection: Inspect your suspension components regularly for signs of wear or damage. Replace worn bushings, shocks, and springs promptly to maintain proper handling and prevent uneven tire wear.

• Wheel and Tire Fitment: Ensure that your wheels and tires are properly fitted to your vehicle. Use hub-centric rings or adapters as needed to ensure that the wheels are correctly centered on the hub. Avoid using oversized tires or wheels with incorrect offset, as this can cause rubbing and damage to your vehicle.

• Careful Driving Habits: Avoid driving aggressively, especially on rough roads. This can put excessive stress on your suspension and tires, leading to premature wear and damage.

• Prompt Attention to Warning Signs: Pay attention to any unusual noises, vibrations, or handling issues. Address any problems promptly to prevent further damage and ensure your safety.

• Regular Maintenance: Follow the manufacturer's recommended maintenance schedule for your vehicle. This includes regular oil changes, fluid checks, and inspections of critical components.

What Owners Say

Real experiences from CHEVROLET owners:

Success Stories

"My problem was the rear rivit became loose on the drivers side. Again once you establish which stem post is loose, JBWeld worked like a charm to reposition the loose stem in a forward position to fully extend the hinge so the tonneau cover clears the front bow." — CSixDude (source)

"OK, for the last few days I have been trying to get the glass into the doors and struggling all the way. I posted before that the passenger side vent window dropped right in and worked with no issues." — mccarley (source)

"Last night I worked on bending and installing new brake lines. Really wish GM had corrected the brake line routing after they moved away from the rear mounted ABS module!" — G_Loc (source)

Owner Experiences

"To replace control arm bushings requires complete disassembly. During reassembly replace ball joints tie rod ends etc . in my case after front end rebuil car is still “squarely”." — ALLEN007 (source)

"Turns out after repeated order mishaps I have three of the RPI rear plate covers now. Electron blue, painted/cleared black, and out of nowhere long after the order issues were resolved a third one showed up this weekend which is a flat black." — Tusc (source)

"I had bought a lift, rebuilt it, and installed and leveled it. I rolled the chassis on it and was trying to level the frame to the lift by adjusting the suspension." — mccarley (source)

Lessons Learned

⚠️ "I still have a feeling it's the tires / rims. I remember when putting the wheels on, looking at the hole in the wheels and the hub diameter they were not perfectly centered, but very close." — ALLEN007 (source)

Pro Tips from Owners

💡 "One thing you should do is open the hood while the engine is idling and listen for the noise under the hood. My supercharger isolator coupling went bad and made a similar noise, though it was sharper and less bassy than the one you recorded." — R3DRUM (source)

💡 "Did you make sure to use hub-centric wheels, or adapters to make them hub centric? Is there a chance that the wheel is not aligned correctly on the hub?" — ALLEN007 (source)

💡 "When idling, the engine will still turn the drive shaft inside the torque tube, so you could get some knocking/rattling there. One thing you should do is open the hood while the engine is idling and listen for the noise under the hood." — R3DRUM (source)

Real Repair Costs

"Black Got home last night and immediately ordered the TrackSpec C5 rear hatch floor kit for cutting the tub out. 50 bucks off for Cyber week. I kinda want one, but their shipping is always nuts." — Midwayman (source)

FAQ

Q: How long does it take to fix an intake leak?

A: Fixing an intake leak can take anywhere from a few hours to a full day, depending on the complexity of the repair and your experience level. Replacing a simple intake manifold gasket may only take a few hours, while more complex repairs, such as replacing a cracked intake manifold, may take longer.

Q: Can I drive with rear tire rub?

A: Driving with rear tire rub is not recommended. Rubbing can damage your tires and potentially affect the vehicle's handling and safety. It is best to address the issue as soon as possible to prevent further damage.

Q: Is uneven tire wear a common issue on the 2020 Chevrolet Corvette?

A: Uneven tire wear can be a common issue on high-performance vehicles like the 2020 Chevrolet Corvette, especially if the vehicle is driven aggressively or if the suspension is not properly maintained. Regular tire maintenance and alignment checks can help prevent uneven tire wear.

Q: DIY vs mechanic - what's recommended for fixing rear issues?

A: Whether to attempt DIY repairs or take your vehicle to a mechanic depends on your mechanical skills, the complexity of the repair, and the tools you have available. Simple repairs, such as replacing worn bushings or adjusting tire pressure, can often be done DIY. More complex repairs, such as intake leak repair or suspension component replacement, may require specialized tools and expertise and are best left to a professional mechanic.

Q: What are the signs of worn rear suspension?

A: Signs of worn rear suspension include excessive bouncing, unusual noises (such as clunking or squeaking), uneven tire wear, and a feeling of instability or reduced handling. If you notice any of these symptoms, it is important to have your suspension inspected by a professional mechanic.

Q: Can incorrect wheel offset cause rear problems?

A: Yes, incorrect wheel offset can cause several rear problems, including rubbing, poke, and uneven tire wear. Wheels with the wrong offset can cause the tires to make contact with the fender or suspension components, leading to damage and affecting the vehicle's handling.