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When customizing a Subaru BRZ with new wheels, ensuring proper fitment is essential for both performance and safety. Accurate measurement and verification help prevent issues like rubbing, poor handling, or damage to the vehicle. This guide walks you through the process of measuring and verifying wheel fitment for your custom build.
Tools Needed for Measurement
- Measuring tape or digital caliper
- Chalk or masking tape
- Jack and jack stands
- Wheel spacer (optional)
- Mirror (for hard-to-see areas)
Step-by-Step Measurement Process
1. Measure Wheel Width and Diameter
Start by measuring the width and diameter of your current wheels. Use a measuring tape or caliper to record the width from bead seat to bead seat and the diameter across the wheel’s face. This establishes a baseline for your new wheels.
2. Determine Offset and Backspacing
The wheel offset (ET) indicates how far the wheel’s mounting surface is from its centerline. Measure the distance from the mounting pad to the outer edge of the wheel to verify fitment. Backspacing is the distance from the mounting surface to the back edge of the wheel.
3. Measure Clearance with the Vehicle
Jack up the car and remove the wheel. Use chalk or masking tape to mark the tire’s position relative to the fender and suspension components. Reinstall the wheel loosely and turn it to check for rubbing or interference during full lock or suspension travel.
Verifying Fitment and Adjustments
Once measurements are complete, compare them with the specifications of your new wheels. Ensure the width and offset do not cause rubbing against the fender, suspension, or brake components. If necessary, use spacers or choose different wheels to achieve proper fitment.
Final Tips for a Perfect Fit
- Always double-check measurements after installing new tires or suspension modifications.
- Test drive the vehicle to feel for any unusual sounds or handling issues.
- Consult with a professional if you’re unsure about fitment or modifications.
Proper measurement and verification of wheel fitment ensure your Subaru BRZ looks great and performs safely. Taking the time to measure accurately can save you time and money in the long run, helping you achieve your custom build goals.