BMW 4 Series Tire Replacement Review — Glossy Wheel Refinish
Service Price
$115–150
Estimated price · Actual price may vary by shop
Before
After
Process photos
BMW 4 Series ST 19-inch wheel replacement and refinishing. Restored to a glossy, near-original condition.
BMW 4 Series ST: Understanding its Wheel Characteristics
The BMW 4 Series ST, a blend of sport sedan and touring capabilities, is known for its low profile and sporty wheel design. The 19-inch wheels offer a striking visual impact but feature thinner tire sidewalls, making them more susceptible to direct impacts from road surfaces. Consequently, damage from potholes and curb contact is more frequent compared to standard sedans. Many owners opt for cost-effective yet high-quality replacements, choosing compatible used wheels or similar designs due to the high cost of genuine BMW wheels. Ensuring the correct offset (ET) and PCD specifications is crucial for both aesthetic harmony and driving safety. For this model, common compatible specifications include 8.0J ET32 or 9.0J ET35 with a 5H 120 PCD.
Assessing Used Wheels: A Critical Step
When selecting used wheels, the primary checks should be for oxidation (white spots) and minor cosmetic scratches. Oxidation requires additional surface preparation before refinishing, impacting the final quality and cost. Structural issues like bending (aluminum deformation) or cracks necessitate more than just repair; severe cases may require complete wheel replacement. The wheels in this case had some oxidation and surface scratches but no structural damage, allowing for a restoration process focused on achieving a near-original finish through professional sanding, powder coating, and a glossy top coat.
BMW 4 Series Wheel Refinishing Process
Installation process:
- Surface Cleaning and Inspection: The wheels are thoroughly cleaned with a high-pressure washer to remove dirt, brake dust, and iron particles that could mar the surface during sanding. A detailed inspection follows to assess the extent of oxidation, scratch depth, and any signs of deformation, which determines the final refinishing approach and timeline.
- Surface Sanding (240-1000 grit): A multi-stage sanding process is employed to remove imperfections. Starting with 240-grit sandpaper to address rough surfaces (approx. 30 minutes), the process progresses through 400, 600, and finally 1000-grit sandpaper for a progressively finer finish (totaling approx. 1.5 hours). Skipping this step can lead to paint adhesion issues and a compromised finish.
- Primer Application: A thin layer of primer is applied to enhance paint adhesion to the aluminum surface, directly impacting the longevity and durability of the final coating. The primer requires approximately 2 hours to dry.
- Powder Coating: Powder coating involves applying powdered paint electrostatically to the wheel surface, followed by curing in an oven at 180-200°C. This method offers superior hardness and durability compared to liquid paint and is more environmentally friendly.
- Glossy Top Coat: A final clear coat is applied to provide a high-gloss finish and protect the underlying paint layers from UV damage and environmental factors.
The result is a set of 19-inch wheels that not only look new but are also protected for continued driving enjoyment on the BMW 4 Series ST.
Frequently Asked Questions
Q. How much does tire replacement cost for a BMW 4 Series?
The cost for wheel refinishing on a BMW 4 Series, as seen in this review, can vary but typically falls within a range comparable to professional detailing services. In the US, a full set of four wheels can range from $400 to $1000 depending on the complexity of the damage and the desired finish.
Q. How long does tire replacement last on a BMW 4 Series?
A professionally refinished wheel can last for many years, provided it is maintained properly. Regular cleaning and avoiding harsh chemicals will help preserve the finish, while careful driving can prevent new damage.
Q. Is tire replacement worth it for a BMW 4 Series?
Wheel refinishing is highly beneficial for BMW 4 Series owners looking to restore their vehicle's aesthetic appeal without the high cost of new wheels. It's particularly valuable for those with minor damage or cosmetic wear who want to maintain the car's premium look.
Q. How is tire replacement done on a BMW 4 Series?
Wheel refinishing typically involves several steps: thorough cleaning and inspection, multi-stage sanding to remove imperfections, primer application for adhesion, powder coating for durability, and a final clear coat for protection and gloss. This process restores the wheels to a like-new condition.
Q. What is the best tire replacement option for a BMW 4 Series?
For cosmetic issues and minor damage, professional wheel refinishing offers excellent value and results, restoring the original look. For significant structural damage like cracks or severe bends, replacing the wheel entirely with a compatible option is the safest and most recommended choice.
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