Mercedes-Benz CLK-Class Wheel Bolt Pattern, Rim Size, Hub Bore, And Offsets

Introduction

The Mercedes-Benz CLK-Class represents a perfect blend of luxury, performance, and timeless design. Produced between 1997 and 2009, the CLK-Class spanned two generations: the W208 (1997–2003) and W209 (2003–2009). Both generations bring distinct characteristics and engineering prowess. When upgrading or replacing wheels, proper fitment is vital for maintaining handling, safety, and performance. Whether you're restoring factory wheels or opting for aftermarket options, ensuring precise fitment will preserve the CLK-Class’s balance and elegance.

This guide delves into the essential aspects of wheel fitment for both generations of the CLK-Class, helping you select the ideal wheels for your coupe or convertible.

Understanding Wheel Fitment

Wheel fitment refers to how well a wheel matches the vehicle’s specifications, ensuring it aligns properly with the suspension, brakes, and body. Key parameters include:

• Wheel Size: Affects tire fitment and interaction with the suspension and bodywork. CLK-Class wheels range from 16 to 19 inches, depending on the generation and trim level.

• Offset (ET): The distance between the wheel's centerline and its mounting surface. CLK-Class offsets vary from ET30 to ET40, depending on the model.

• Bolt Pattern (PCD): The arrangement and spacing of bolt holes. The CLK-Class uses a 5x112 pattern.

• Hub Bore: The diameter of the central hole that fits onto the hub. Both W208 and W209 models have a 66.6 mm hub bore.

Ensuring proper fitment is crucial as deviations can cause issues like rubbing, vibrations, or compromised handling.

First Generation CLK-Class (W208; 1997–2003)

The W208 CLK-Class offers a blend of luxury and sport. Factory wheels feature a 5x112mm bolt pattern, 66.6 mm hub bore, and offset range of ET30 to ET37. Factory wheel sizes include:

• Base Models: 16x7 inches

• Sport Trims: 17x7.5 inches (front), 17x8.5 inches (rear) for a staggered setup

This staggered configuration enhances rear-wheel traction, complementing the CLK’s sporty dynamics. Popular aftermarket setups include 18x8 inches (front) and 18x9 inches (rear), keeping the staggered look while upgrading aesthetics. Recommended offsets are ET30 to ET37. For optimal tire pairing, consider 225/40R18 (front) and 255/35R18 (rear) for improved grip and steering.

Lightweight alloy wheels reduce unsprung weight, enhancing handling. Ensure the 66.6 mm hub bore is matched, or use hub-centric rings to prevent vibrations. Be cautious with offsets lower than ET30 or wheels wider than 9.5 inches, as they may cause rubbing on the fenders. Solutions include using spacers or narrower tires, along with alignment adjustments.

Second Generation CLK-Class (W209; 2003–2009)

The W209 CLK-Class brought modern styling and better engineering. It shares the 5x112 bolt pattern and 66.6 mm hub bore with the W208, but the offset range is slightly more aggressive, from ET30 to ET40. Factory wheel sizes include:

• Base Models: 16x7.5 inches

• AMG Trims: 18x8 inches (front), 18x9 inches (rear)

The W209’s sportier chassis allows for larger aftermarket wheels, with common configurations of 19x8.5 inches (front) and 19x9.5 inches (rear). Offsets should remain between ET30 and ET40 to ensure compatibility with the suspension and body.

High-performance tires, such as 235/35R19 (front) and 265/30R19 (rear), complement these setups, enhancing grip. Forged wheels, favored for their lightweight properties, improve acceleration and braking. While the W209 is more accommodating to wider wheels, improper offsets can still cause rubbing, especially with wheels exceeding 10 inches in the rear. For AMG models, ensure brake caliper clearance with wheels designed for this purpose.

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Comparing W208 and W209 Fitment

Both generations share a 5x112 bolt pattern and a 66.6 mm hub bore, but their fitment requirements differ slightly. The W208 accommodates offsets from ET30 to ET40, while the W209 prefers ET30 to ET35, reflecting changes in suspension geometry. The W208 typically supports wheels from 16 to 17 inches, while the W209 can accommodate up to 19 inches. Understanding these distinctions is crucial for ensuring proper fitment, safety, and performance.

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Key Fitment Tips for Mercedes CLK-Class Owners

To maintain your CLK-Class’s performance and aesthetics, follow these key tips:

• Always verify that the bolt pattern (5x112) and hub bore (66.6 mm) match the wheels to avoid installation issues.

• Stick to recommended offsets: ET30 to ET40 for the W208 and ET30 to ET35 for the W209, ensuring proper alignment with the suspension and fenders.

• For staggered setups, choose wider rear wheels for enhanced traction. Ensure tire sizes and widths are compatible to avoid rubbing.

• Lightweight alloy wheels are a great choice for reducing unsprung weight, which improves handling and braking.

• Always perform a professional alignment post-installation to ensure proper handling and tire wear.

Common Fitment Issues and Solutions

If your wheel upgrade or replacement doesn’t follow proper specifications, you may face common fitment issues. Here’s how to resolve them:

• Rubbing Against Fenders or Suspension: This occurs with low offsets (below ET30) or oversized tires. Stick to recommended offsets and consider rolling the fenders or using narrower tires.

• Brake Caliper Clearance: AMG models with larger brakes may face clearance issues. Ensure the wheel’s inner diameter provides sufficient space for the brake calipers.

• Vibration at Higher Speeds: If the wheel’s hub bore doesn’t match the car’s 66.6 mm specification, use hub-centric rings to prevent vibrations.

• Tire Stretching or Bulging: Match tire width with wheel size to avoid uneven wear or poor grip.

• Limited Suspension Travel: When using larger wheels, suspension travel may be reduced, leading to a harsher ride. Avoid excessively wide or tall wheels to maintain comfort.

By addressing these issues proactively, you can enjoy a safe and high-performance driving experience with your CLK-Class.

Conclusion

Achieving the perfect wheel fitment for your Mercedes-Benz CLK-Class is essential for maintaining its performance, safety, and style. Whether you own the refined W208 or the sportier W209, understanding critical specifications like offset, bolt pattern, and hub bore ensures your wheels are compatible and functional. By following fitment guidelines and considering both aesthetic and performance enhancements, you can preserve the iconic look and driving dynamics of your CLK-Class. Always consult professionals or trusted tools for precise fitment and enjoy the road with confidence.