When upgrading to a new set of wheels, ensuring they fit properly around your big brake setup is crucial. If you own a performance car like a Genesis Coupe, Nissan 370Z, or Mitsubishi Evo with large Brembo brakes, improper measurements can lead to costly mistakes. This guide will walk you through how to measure for big brakes to ensure your wheels fit perfectly.
1. Common Fitment Issues with Big Brakes
Big brake kits can pose clearance challenges for new wheels, particularly due to three key factors:
Offset Considerations
Wheel offset plays a significant role in brake clearance. A higher offset (which pulls the wheel face inward) can create clearance issues, while a lower offset typically provides more room for larger calipers. When selecting wheels, opt for designs that offer deeper concave profiles or additional spoke clearance.
Wheel Design and Spoke Clearance
Certain wheel models, such as the ESR SR08, have additional space behind the spokes to accommodate larger calipers. In contrast, wheels like the Cosmis Racing XT-206R may not have as much spoke clearance, increasing the likelihood of brake interference.
Barrel Clearance
The barrel of the wheel can also contact the calipers, especially when downsizing your wheel diameter or upgrading to a bigger brake setup. Make sure to check the inner barrel dimensions before purchasing new wheels.
2. How to Measure for Big Brake Clearance
The best way to determine fitment is by taking precise measurements using a digital micrometer. Here’s how:
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Use the hub surface as a reference point
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Measure from the hub to the bottom of the caliper (inner clearance)
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Measure from the hub to the top of the caliper (outer clearance)
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Measure from the hub to the face of the caliper (spoke clearance)
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Check for any protrusions that might interfere with the wheel barrel
These measurements will help determine if your chosen wheels will clear your big brakes without requiring modifications.
3. Next Steps: Ensuring Proper Fitment
Once you’ve taken your measurements, here are three ways to confirm wheel fitment:
A. Use a Brake Clearance Template
If you’re upgrading your brake kit, you can use your measurements to create a clearance template. Many big brake kit manufacturers provide printable templates to test against potential wheels before purchase.
B. Check Manufacturer Specifications
Most reputable wheel manufacturers provide detailed fitment specs, including spoke and barrel clearance. Reviewing these specs before purchasing can save you time and money.
C. Research Existing Fitments
Chances are, someone has already fitted aftermarket wheels on a car with a similar big brake setup. Search online car forums, check fitment galleries, or ask within car communities to see what works for others.
4. Final Thoughts: Measure Twice, Order Once
Measuring for big brake clearance may seem intimidating at first, but with the right approach, it’s easy to ensure a perfect fit. Before making a final decision:
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Double-check all measurements
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Consult manufacturer specs
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Leverage online resources and fitment guides
The last thing you want is to order custom wheels only to find they don’t fit. Take your time, measure carefully, and enjoy the performance and aesthetic benefits of your new wheels with confidence.
