Wheel tubs, also known as mini-tubs, are a modification that can significantly enhance the look and performance of your car, particularly if you’re aiming for a more aggressive stance and improved traction. By increasing the available space in your wheel wells, you can accommodate wider tires, leading to better grip and a more muscular aesthetic. This guide will walk you through the process of installing wheel tubs, focusing on achieving a professional and robust result for your vehicle.
Why Install Wheel Tubs?
The primary reason car enthusiasts opt for wheel tub installation is to gain clearance for wider tires. Stock wheel wells often limit the width of tires you can install without encountering rubbing issues, especially during cornering or over bumps. Installing wheel tubs effectively expands this space, allowing for:
- Larger Tires: Accommodate wider, higher-performance tires for increased contact patch and superior traction.
- Improved Handling: Wider tires contribute to better cornering grip and overall handling performance.
- Aggressive Stance: Wider rear tires, made possible by wheel tubs, give your car a more powerful and visually appealing stance.
- Custom Wheel Fitment: Allows for a wider range of wheel offsets and backspacing to achieve the desired look.
While some argue that modifications like mini-tubs might be overkill for moderate tire upgrades, especially when offset kits and spring perch adjustments can offer simpler solutions for fitting slightly wider tires, the benefits of wheel tubs become undeniable when aiming for truly substantial tire size increases and a no-compromise approach to performance and aesthetics.
Choosing the Right Wheel Tubs
Selecting the appropriate wheel tubs is crucial for a successful installation. Consider these factors:
- Vehicle Make and Model: Ensure the wheel tubs are designed for your specific car model. While universal tubs exist, direct-fit options generally simplify installation.
- Desired Tire Size: Determine the maximum tire width you intend to run. This will dictate the extent of the wheel tub modification required.
- Material and Construction: Steel wheel tubs are common due to their strength and weldability. Ensure they are made from high-quality steel for durability. Consider reputable brands known for their quality and fitment. While the original discussion mentions US Cartool in the context of subframe connectors, exploring brands known for wheel tub fabrication is essential for this specific modification.
Step-by-Step Guide to Wheel Tub Installation
Disclaimer: Wheel tub installation is an advanced modification that typically involves welding and significant automotive knowledge. If you are not experienced with these procedures, professional installation is highly recommended. Safety precautions, including proper welding techniques and personal protective equipment, are paramount throughout this process.
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Preparation and Safety:
- Gather Tools and Materials: You will need welding equipment (MIG or TIG welder), cutting tools (plasma cutter, cut-off wheel, or reciprocating saw), grinding tools, measuring tools, clamps, safety glasses, welding gloves, and a respirator.
- Vehicle Preparation: Safely lift and support the vehicle. Remove the rear wheels, tires, and any components in the wheel well area, including the rear seats, interior trim, and potentially the fuel tank or exhaust system, depending on your car model and the extent of the tub modification. Disconnect the battery.
- Clean the Work Area: Thoroughly clean the wheel wells and surrounding areas to remove dirt, rust, and undercoating. This ensures clean welds and proper fitment.
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Marking and Cutting:
- Determine Cut Lines: Carefully measure and mark the areas to be cut in the existing wheel wells. Accurately transferring measurements from the new wheel tubs or templates is critical. Ensure sufficient clearance for the new tubs and desired tire size, considering suspension travel.
- Precise Cutting: Using your chosen cutting tools, carefully cut along the marked lines. Take your time and prioritize accuracy to minimize gaps and ensure a clean cut.
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Wheel Tub Fitment and Welding:
- Trial Fit: Position the new wheel tubs into the cut wheel wells. Check for proper fitment, ensuring they sit flush against the existing body panels and provide the desired tire clearance. Make any necessary adjustments by trimming or grinding for optimal fit.
- Secure and Clamp: Once satisfied with the fit, use clamps to securely hold the wheel tubs in place. Ensure proper alignment and consistent gaps for welding.
- Welding: Weld the new wheel tubs into place, starting with tack welds to secure the position and then proceeding with continuous welds. Use proper welding techniques to create strong, leak-proof seams. Weld both the inner and outer seams for maximum strength and durability.
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Finishing and Sealing:
- Grind and Smooth Welds: Grind down the welds for a smooth and professional finish. Remove any sharp edges or weld spatter.
- Seam Sealing: Apply seam sealer to all welded seams, both inside and outside the wheel wells, to prevent moisture and corrosion from entering.
- Undercoating and Paint: Apply undercoating to the wheel tub area to protect against rust and road debris. Optionally, paint the wheel tubs to match the vehicle’s body color or for a custom look.
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Reassembly:
- Reinstall Components: Carefully reinstall all components that were removed, including interior trim, rear seats, fuel tank (if removed), exhaust system (if removed), and any other related parts.
- Wheel and Tire Installation: Mount your wider wheels and tires. Check for proper clearance throughout the suspension travel range.
- Final Inspection: Double-check all connections, welds, and clearances. Ensure everything is secure and functioning correctly.
Considerations and Tips for Wheel Tub Installation
- Spring Relocation: In some cases, wheel tub installation may be combined with spring relocation to further maximize tire clearance. This involves moving the leaf spring or coil spring mounts inward.
- Suspension Adjustments: Wider tires and wheel tubs may necessitate adjustments to your suspension setup, such as ride height or alignment, to ensure optimal handling and tire wear.
- Professional Help: If you are unsure about any aspect of wheel tub installation, especially welding and fabrication, seek professional assistance from a qualified automotive shop experienced in custom modifications.
Conclusion
Installing wheel tubs is a transformative modification that can unlock the potential for larger tires and a more aggressive stance for your vehicle. While it is a complex process requiring careful planning and execution, the results – improved performance, enhanced aesthetics, and the ability to run wider tires – can be well worth the effort for car enthusiasts seeking to take their ride to the next level. Remember to prioritize safety, proper technique, and, when in doubt, consult with professionals to ensure a successful and high-quality wheel tub installation.
