How long is shipping for K&N Engineering?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the K&N Replacement Air Filter for BMW R18 Series 2021-2024?

Cold air intakes typically install in 30-60 minutes with basic hand tools. No tuning required for most plug-and-play kits.

How long is shipping for K&N Engineering?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the K&N Replacement Air Filter for BMW R18 Series 2021-2024?

Cold air intakes typically install in 30-60 minutes with basic hand tools. No tuning required for most plug-and-play kits.

How long is shipping for K&N Engineering?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the K&N Replacement Air Filter for BMW R18 Series 2021-2024?

Cold air intakes typically install in 30-60 minutes with basic hand tools. No tuning required for most plug-and-play kits.

How long is shipping for K&N Engineering?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the K&N Replacement Air Filter for BMW R18 Series 2021-2024?

Cold air intakes typically install in 30-60 minutes with basic hand tools. No tuning required for most plug-and-play kits.

How long is shipping for K&N Engineering?

Most in-stock items ship same or next business day. Free shipping on orders over $99 in the continental US. Tracking is provided via email as soon as your order leaves our warehouse.

How do I install the K&N Replacement Air Filter for BMW R18 Series 2021-2024?

Cold air intakes typically install in 30-60 minutes with basic hand tools. No tuning required for most plug-and-play kits.

K&N Engineering

K&N Replacement Air Filter for BMW R18 Series 2021-2024

Name: K&N Replacement Air Filter for BMW R18 Series 2021-2024
Brand: K&N Engineering
SKU: KNNBM-1821
Price: 60.65 USD
Availability: InStock

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K&N Engineering

K&N Replacement Air Filter for BMW R18 Series 2021-2024

SKU: KNNBM-1821

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About K&N Engineering K&N has been the world's leader in ...Read More

Price:

$60.65

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Car Wheel Size Chart

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

225 = Tire width in mm
45 = Aspect ratio (height as % of width)
R17 = Rim diameter in inches

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GGCRACING Discount

Product Details

Product Description

Part Numbers

Sizing & Fit

About K&N Engineering

K&N has been the world's leader in washable, reusable performance air filters since 1969. From the legendary cone filter to complete cold-air intake systems, K&N's cotton-gauze element delivers more airflow than paper while staying serviceable for the life of the vehicle.

Watch in action

K&N High-Flow Replacement Air Filter for BMW R18 Series

Elevate your BMW R18 riding experience with the K&N High-Flow Replacement Air Filter (Part Number BM-1821). This premium air filter is engineered to provide an increase in horsepower and acceleration by improving airflow to your engine while ensuring excellent contaminant capture. Designed as a direct replacement for your stock filter, installation is simple and hassle-free.

Key Features & Benefits:

Enhanced Airflow: The state-of-the-art layered, oiled cotton media design allows for increased air volume, contributing to better performance.
Superior Filtration: Effectively traps dirt and debris, protecting your R18's engine for its entire lifespan.
Washable & Reusable: This filter is designed to be cleaned and reused, offering exceptional long-term value and reducing waste.
Easy Installation: Installs directly into the factory air box, requiring no modifications.
Engineered for Performance: Provides a noticeable boost in power and throttle response for your BMW R18.

Vehicle Fitment:

This K&N air filter is compatible with the following BMW R18 models:

BMW R 18: 2021-2024
BMW R 18 100 Years: 2023
BMW R 18 B: 2022-2024
BMW R 18 Classic: 2021-2024
BMW R 18 First Edition: 2021
BMW R 18 Roc: 2023-2024
BMW R 18 Transcontinental: 2022-2024

Upgrade your BMW R18 with a K&N High-Flow Air Filter for improved performance and lasting engine protection. Get yours today at GGCRACING!

Vehicle Fitment

Years	Make	Model	Trim
2021-2024	BMW	R 18	Base
2023	BMW	R 18 100 Years	Base
2022-2024	BMW	R 18 B	Base
2021-2024	BMW	R 18 Classic	Base
2021	BMW	R 18 First Edition	Base
2023-2024	BMW	R 18 Roctane	Base
2022-2024	BMW	R 18 Transcontinental	Base

Often bought with

Other popular K&N Engineering products customers consider together:

Product Details

Product Description

Part Numbers

Sizing & Fit

About K&N Engineering

Watch in action

K&N High-Flow Replacement Air Filter for BMW R18 Series

Key Features & Benefits:

Enhanced Airflow: The state-of-the-art layered, oiled cotton media design allows for increased air volume, contributing to better performance.
Superior Filtration: Effectively traps dirt and debris, protecting your R18's engine for its entire lifespan.
Washable & Reusable: This filter is designed to be cleaned and reused, offering exceptional long-term value and reducing waste.
Easy Installation: Installs directly into the factory air box, requiring no modifications.
Engineered for Performance: Provides a noticeable boost in power and throttle response for your BMW R18.

Vehicle Fitment:

This K&N air filter is compatible with the following BMW R18 models:

BMW R 18: 2021-2024
BMW R 18 100 Years: 2023
BMW R 18 B: 2022-2024
BMW R 18 Classic: 2021-2024
BMW R 18 First Edition: 2021
BMW R 18 Roc: 2023-2024
BMW R 18 Transcontinental: 2022-2024

Upgrade your BMW R18 with a K&N High-Flow Air Filter for improved performance and lasting engine protection. Get yours today at GGCRACING!

Vehicle Fitment

Years	Make	Model	Trim
2021-2024	BMW	R 18	Base
2023	BMW	R 18 100 Years	Base
2022-2024	BMW	R 18 B	Base
2021-2024	BMW	R 18 Classic	Base
2021	BMW	R 18 First Edition	Base
2023-2024	BMW	R 18 Roctane	Base
2022-2024	BMW	R 18 Transcontinental	Base

Often bought with

Other popular K&N Engineering products customers consider together:

Product Details

Product Description

About K&N Engineering

Watch in action

K&N High-Flow Replacement Air Filter for BMW R18 Series

Key Features & Benefits:

Enhanced Airflow: The state-of-the-art layered, oiled cotton media design allows for increased air volume, contributing to better performance.
Superior Filtration: Effectively traps dirt and debris, protecting your R18's engine for its entire lifespan.
Washable & Reusable: This filter is designed to be cleaned and reused, offering exceptional long-term value and reducing waste.
Easy Installation: Installs directly into the factory air box, requiring no modifications.
Engineered for Performance: Provides a noticeable boost in power and throttle response for your BMW R18.

Vehicle Fitment:

This K&N air filter is compatible with the following BMW R18 models:

BMW R 18: 2021-2024
BMW R 18 100 Years: 2023
BMW R 18 B: 2022-2024
BMW R 18 Classic: 2021-2024
BMW R 18 First Edition: 2021
BMW R 18 Roc: 2023-2024
BMW R 18 Transcontinental: 2022-2024

Upgrade your BMW R18 with a K&N High-Flow Air Filter for improved performance and lasting engine protection. Get yours today at GGCRACING!

Vehicle Fitment

Years	Make	Model	Trim
2021-2024	BMW	R 18	Base
2023	BMW	R 18 100 Years	Base
2022-2024	BMW	R 18 B	Base
2021-2024	BMW	R 18 Classic	Base
2021	BMW	R 18 First Edition	Base
2023-2024	BMW	R 18 Roctane	Base
2022-2024	BMW	R 18 Transcontinental	Base

Often bought with

Other popular K&N Engineering products customers consider together:

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

K&N Replacement Air Filter for BMW R18 Series 2021-2024

K&N Replacement Air Filter for BMW R18 Series 2021-2024

Car Wheel Size Chart

How to Read Tire Size

Product Details

About K&N Engineering

Watch in action

K&N High-Flow Replacement Air Filter for BMW R18 Series

Key Features & Benefits:

Vehicle Fitment:

Vehicle Fitment

Often bought with

Product Details

About K&N Engineering

Watch in action

K&N High-Flow Replacement Air Filter for BMW R18 Series

Key Features & Benefits:

Vehicle Fitment:

Vehicle Fitment

Often bought with

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Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5

Wheel Diameter (inches)	Tire Width (mm)	Aspect Ratio	Rim Width (inches)
14	185	65	5.5
15	195	60	6.0
16	205	55	6.5
17	215	50	7.0
18	225	45	7.5
19	235	40	8.0
20	245	35	8.5