How to Check Rotor Size by VIN Number?

Checking rotor size by Vin number is a simple and effective way to determine the required replacement for your vehicle’s rotors. 

Rotor size can be determined by measuring the diameter of the rotor at two points that are closest to each other on the circumference, or the radial distance from the hub to the blade tip.

The measurement should be taken using an accurate caliper and referenced against your car model year and engine type designation in order to ensure correct fitment.

It is important to inspect all four rotors when replacing them as they may have different sizes depending on the make/model/year combination, even if only one has been replaced within the past 12 months or so.

What is VIN Number

A VIN number is a unique identification number that identifies a vehicle. It is also known as the vehicle identification number or VIN. It is different from the license plate of a car, which has an assigned number.

A VIN is used to track cars and identify them at any point in time, while a license plate or registration can only be used to identify vehicles at specific locations.

What is VIN Number

How to Check Rotor Size by Vin Number -Step by Step Guide

If you have your car’s VIN number handy, you can check the rotor size yourself. The dealership may not tell you this information, but they will likely give you the genuine part numbers for your vehicle.

Verify Wheel and Tire Sizes

Most diesel engines require a rotor size that is at least 1 inch larger than the wheel and tire sizes. This will ensure the proper operation of the engine’s fuel injectors, which are located in the exhaust manifold.

Verify Wheel and Tire Sizes

OEM Rotor/Pad Part Numbers Are Based on Your Car’s Vin Number

If you’re having trouble knowing which rotor size your car needs, this guide will help. First, find the VIN number on your car.

This is a series of numbers that are usually located on a plaque near the driver’s door. Next, use our rotor size calculator to figure out what size rotor your vehicle needs.

OEM Rotor/Pad Part Numbers

Measure Front Wheel

If your vehicle has ABS or electronic stability control, you will need to disable these systems before checking your rotor size. 

You can do this by turning off the ignition key and then pressing and holding both brake pedal buttons at once for 3 seconds while simultaneously removing the front wheel from your car using a wrench or jack. 

If your vehicle does not have ABS or ECS, simply remove the front wheel without disabling any systems first.

Measure Front Wheel

Measure Rotor Diameter from Center Hole

To measure rotor diameter, locate the center hole on the hubcap or rim (where the hub meets rims), make an “X” with a straight edge perpendicular to it, and draw a line through the center hole to the outer ring on the hubcap/rim (see illustration below).

Note: The distance between marks should be equal to the actual rotor diameter measured in inches (measured multiple times).

Measure Rotor Diameter from Center Hole


Can I put bigger rotors on my car?

You need proper brake calipers in order to install larger rotors on your car. Your car will require the correct clearance in order to accommodate the larger rotor.

Out-of-spec rotor wear may cause issues if you attempt to install a larger rotor on an improperly configured vehicle. You might have clearance issues with the smaller brake caliper brackets if you try to use them with a bigger rotor.

Does the size of the rotor matter?

When it comes to braking, bigger is better. Upgrading your brake rotor can improve your stopping power and save you money in the long run. 

There are different types of brakes and rotors made for different vehicles, so be sure to measure yours before making a purchase.

Can I use any rotor with disc brakes?

If you have disc brakes on your bike, make sure to choose a rotor that is compatible. Choose a rotor with enough brake tracks so it can handle the force of your braking system.

Make sure the rotor is also sized correctly for your bike and has no damage.

Do bigger rotors stop better?

Larger rotors can help to reduce heat transfer and are better at stopping. Larger rotors require less braking force, last longer than smaller rotors, and are more expensive.

Are drilled rotors worth it?

Drilled rotors offer better-wet bite in rainy conditions than slotted rotors. They hold up well over the life of the rotor and deliver more friction and more bite than their slot counterparts.

Drilled rotors are a better choice in areas that experience rain frequently.

Will a 203 rotor fit a 200?

If your fan has a 203 mm rotor, you will need to purchase an adapter. The adapter has a 1.5 mm bigger radiator and both rotors are round. There is no height difference between them, so they fit together like a puzzle.

You may need to slightly modify the adapter if it does not already have the correct holes in it.

To Recap

Rotor size can be checked by VIN number to help diagnose and correct a problem with your engine. Checking rotor size is important for proper engine function and safety, so make sure you do it regularly.

If you need to replace your car’s brake rotors, it is important to know the VIN (vehicle identification number). You might like OEM brake rotors in this case.

The size of a car’s front and rear brake rotors can be determined by looking at the VIN number and using this information, you will be able to choose the correct rotor size.

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