# Genius KG-100178 Disc Brake Rotor for 1998-2008 BMW Z4, BMW 320i and More - Front

### Performance Overview

Genius has been the undisputed leader in coated rotor manufacturing for the last 15 years thanks to it's groundbreaking lab engineered G-Cast™ iron cast and G-Coat™ dipped conative. Genius in-house engineered managed to develop the best combination of iron cast and coating to produce unmatched protection that adhere and stay durable for the lifetime of the rotor, without compromising on the rotor braking performan...

### Key Features

-   Engineered with with Carbon-Enhanced G-Cast™ (G11H18/G3000) iron castings to achieve an optimal braking performance (strength, stability, durability)
-   Exclusive G-Coat™ double-layer (8µm) protective coating provides rust protection on 100% of the non-braking surface
-   100% Precision Spin and Mill-Balanced for smoother stopping and zero vibration at any speed
-   Cross-Hatched smooth surface to improve the pad's ability to grip the rotor surface, especially during initial brake applications or in wet conditions
-   Double disc ground finish eliminates lateral run-out and DTV (disk thickness variation) issues on the rotor and improves pad-rotor bed-in
-   Tested for maximum tolerance to voluminous amount of constant thermal cycles

### Package include:

-   2x Disc Brake Rotor

### Vehicle Fitment

**Fitment Summary:** 1998-2008 BMW Z4, BMW 320i, BMW 325Ci, BMW 325i, BMW 325xi, BMW Z3

**Position:** Front

-   2006-2008 BMW Z4 — Position: Front | Fitment Precision: Roadster 3.0i
-   2003-2005 BMW Z4 — Position: Front | Fitment Precision: 3.0L
-   2001-2005 BMW 320i — Position: Front | Note: With 300mm Diameter Front Rotor
-   2001-2006 BMW 325Ci — Position: Front
-   2001-2005 BMW 325i — Position: Front
-   2001-2005 BMW 325xi — Position: Front
-   2001-2002 BMW Z3 — Position: Front | Fitment Precision: 3.0L
-   2000 BMW 323Ci — Position: Front | Fitment Precision: Convertible
-   2000 BMW 323i — Position: Front | Fitment Precision: Wagon
-   2000 BMW 328Ci — Position: Front

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the compatibility list above before purchase. This listing includes fitment data for 1998-2008 BMW Z4, BMW 320i, BMW 325Ci, BMW 325i, BMW 325xi, BMW Z3.

**What part number is this?**  
The listed part number is KG-100178.

**Is this product designed for direct replacement?**  
Yes. This Disc Brake Rotor is intended to match compatible vehicle applications listed in the fitment section.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment chart before ordering.

### Common Searches

-   Disc Brake Rotor for BMW Z4
-   KG-100178 fitment
-   Genius Disc Brake Rotor
-   Front Disc Brake Rotor
-   1998-2008 BMW Z4 Disc Brake Rotor

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2006

BMW

Z4

Front

Roadster 3.0i

2007

BMW

Z4

Front

Roadster 3.0i

2008

BMW

Z4

Front

Roadster 3.0i

2003

BMW

Z4

Front

3.0L

2004

BMW

Z4

Front

3.0L

2005

BMW

Z4

Front

3.0L

2001

BMW

320i

Front

With 300mm Diameter Front Rotor

2002

BMW

320i

Front

With 300mm Diameter Front Rotor

2003

BMW

320i

Front

With 300mm Diameter Front Rotor

2004

BMW

320i

Front

With 300mm Diameter Front Rotor

2005

BMW

320i

Front

With 300mm Diameter Front Rotor

2001

BMW

325Ci

Front

2002

BMW

325Ci

Front

2003

BMW

325Ci

Front

2004

BMW

325Ci

Front

2005

BMW

325Ci

Front

2006

BMW

325Ci

Front

2001

BMW

325i

Front

2002

BMW

325i

Front

2003

BMW

325i

Front

2004

BMW

325i

Front

2005

BMW

325i

Front

2001

BMW

325xi

Front

2002

BMW

325xi

Front

2003

BMW

325xi

Front

2004

BMW

325xi

Front

## Details

- **Price:** 101.14 CAD
- **Vendor:** Genius
- **Type:** Disc Brake Rotor
- **Tags:** 1998-2008 BMW Z4, Automotive Parts, BMW Z4, Brake Parts, Disc Brake Rotor, Front, Genius, KG-100178, Replacement Parts, Vehicle Fitment

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 101.14 CAD | In stock |

## Images

- Genius KG-100178 Disc Brake Rotor for 1998-2008 BMW Z4, BMW 320i and More - Front

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/genius-kg-100178-disc-brake-rotor-1998-2008-bmw-z4)
> Updated: 2026-07-16