Motorcycle Fork Diameter library for LED Headlight conversions

When you're customizing your cafe racer, scrambler, brat, or bobber, changing the headlight can drastically alter the bike's look and functionality. However, before you can select the right headlight mounting brackets, you must determine your fork tube diameter. Let's dive into this essential step to ensure a seamless headlight swap.

Identifying the correct fork diameter is crucial for selecting the appropriate headlight mounting brackets. This measurement ensures that your new headlight will fit securely and align perfectly with your front wheel, enhancing both the aesthetics and functionality of your custom build.

To find your fork diameter, you'll need a Vernier Caliper or ruler. The ruler is far less accurate. Measure the diameter of the fork tubes where the brackets will be mounted. This measurement is typically taken at the top of the fork tube, just below the top triple tree.

Or, Use the list we have laid out below to identify your fork outer diameter.

(Just a note, we've tried to make this as accurate as possible.) However, common fork diameters for custom builds range from 32mm to 58mm, but it's best to measure your own forks to be 100% certain.

Once you have your fork diameter, you can choose headlight mounting brackets that match. Many manufacturers provide compatibility information, making it easier to find the right brackets for your bike.

Motorcycle Fork Diameter Reference

Bike Make	Year	Model	Fork Diameter (mm)
Aprilia	RS126	RS125	50-54
Aprilia	1995 - 1998	RS250	50-56
Aprilia	1998 - 2003	RS250	50-55
Aprilia	1997-2004	RSV Mille	53-55
Aprilia	2005	RSV Mille	53-55
Aprilia	1998 - 2004	RSV-R Mille	51-58
BMW	2014-Present	R nineT	55
BMW	2017-Present	R nineT Scrambler	55
BMW	1970-1996	R series (Airhead models preferred)	35-39
BSA	1957-1963	Gold Star	35
BSA	1958-1970	Spitfire	35
Ducati		620DS Multistrada	50-
Ducati	1998-2004	750SS	50-
Ducati	848	848	53-55
Ducati	2001-	S4 900 Monster	50-
Ducati	1997-	ST2 1997	50-
Ducati	999	999	53-55
Ducati	Scrambler	scrambler	50-54
Harley	1986 Late - 1987	883 & 1200 Standard, 883 Deluxe, 883 Hugger	35
Harley	1954 Onward	Big Twins	41
Harley	Pre 1970	Sportster	35.5
Harley	1970 - 1986	Sportster	35.5
Harley	2004 - 2018	Sportster	39
Honda	1972-1983	CB350F	35
Honda	1975-1981	CB400F	35
Honda	1978-1983	CB500/550	35
Honda	1973-1982	CB650	37
Honda	1969-1978	CB750	37
Honda	1978-1982	CX500	35
Honda		CBR250R MC20	37
Honda		CBR250RR MC23	37
Honda		NSR250R MC18 MC21 MC29	41
Honda		CB-1 401	41
Honda	NC31	VFR400 NC31	41
Honda	NC36	RVF400 NC36	50-54
Honda	2003-2005	CBR600RR	54
Honda	2005-2007	CBR600RR	48-55
Honda	2008	CBR600RR	48-56
Honda	1992-1998	CBR900RR	45
Honda	1998-2000	CBR900RR	45
Honda	2000-2001 (929)	CBR900RR	43
Honda	2002-2004	CBR900RR	53-55
Honda	2004-2008	CBR1000RR	53-55
Honda	2009	CBR1000RR	53-55
Kawasaki	1998-2020	W650	39
Kawasaki	2000-2016	W800	43
Kawasaki	2003-Present	Z900	42 (varies slightly by year)
Kawasaki		ZZR251	37
Kawasaki		ZXR250A	50-53
Kawasaki		ZXR400-H	50-52
Kawasaki	1991-2000	ZXR400-L	53-55
Kawasaki	2003-2005	ZX6R	50-
Kawasaki	2005-2007	ZX6R	50-54
Kawasaki	2007-2009	ZX6R	40 Cr
Kawasaki	1996-2004	ZX7R	?
Kawasaki	2004-2006	ZX10R	50-56
Kawasaki	2006-2008	ZX10R	50-?
MV Agusta		F3 675 & 801	50-56
MV Agusta		F5	?
Royal Enfield	2013-Present	Continental GT	41
Royal Enfield	2017-2022	Himalayan	41
Royal Enfield	2022-Present	Himalayan	54
Royal Enfield	2018-Present	Interceptor INT650	41
Suzuki		RGV250 VJ22	?
Suzuki	1991-1996	RGV250 VJ22	50-54
Suzuki	1990-1996	GSX-R400 GK76	50-54
Suzuki	2004-2006	GSX-R600	50-56
Suzuki	2006-2010	GSX-R600	50-55
Suzuki	2010-2016	GSX-R600	40 Cr
Suzuki	2006-2008	GSX-R750	50-55
Suzuki	2001-2003	GSX-R1000	50-56
Suzuki	2003-2005	GSX-R1000	50-56
Suzuki	2005-2007	GSX-R1000	50-?
Suzuki	2008	GSX-R1000	50-?
Suzuki	1998	TL 1000S	50-57
Suzuki	2004	SV 1000S	46-48
Suzuki	1989-1991	GSX-R1100	43-44
Suzuki	1991-1993	GSX-R1100	52-?
Suzuki	1993-1995	GSX-R1100	52-?
Suzuki	1999-2008	GSX-1300R Hayabusa	50-57
Suzuki	2009	GSX-1300R Hayabusa	50-57
Suzuki		Boulevard series	37-41 (varies by year and model)
Suzuki	1976-1983	GS series (GS400, GS550, etc.)	35-38
Suzuki	1985-2009	Intruder series	37-41 (varies by year and model)
Suzuki	2003-2016	SV650	41
Triumph	2001-2017	America	41-43 (varies by year and model)
Triumph	1959-1982 (Classic models preferred)	Bonneville	35-38
Triumph	2000-Present	Bonneville	41
Triumph	2000-Present	Thruxton	41 USD
Triumph	2006-2008	676	54 USD
Triumph	2009-2011	676	41
Triumph	2011-2013	675R	43
Triumph	2013-2017	675R	54 USD
Triumph	2013-2017	675R	54 USD
Yamaha		FZR250R 3LN	38
Yamaha		FZR400RR 3TJ2	43
Yamaha		FZR600 3HE	38
Yamaha		FZR600R 4JH	41
Yamaha	2009-2018	FZ6R	40 Cr
Yamaha	1999-2003	YZF-R6 600	43
Yamaha	2003-2005	YZF-R6 600	43
Yamaha	2006-2008	YZF-R6 600	50-56
Yamaha	2008-2016	YZF-R6 600	40 Cr
Yamaha	1993-1996	YZF750R	50-58
Yamaha	1996-2001	TRX850	41
Yamaha	1996	YZF-1000	48
Yamaha	1998-2002	YZF-R1 (4XV & 5JJ)	50-56
Yamaha	2002-2004	YZF-R1 (5PW)	50-56
Yamaha	2004-2007	YZF-R1 (5VY)	50-56
Yamaha		RD series (RD350, RD400)	35
Yamaha	2000-2015	Road Star series	41-43 (varies by year and model)
Yamaha	1996-2014	Royal Star series	38-41 (varies by year and model)
Yamaha	1978-1999	SR400	38
Yamaha	1978-1999	SR500	38
Yamaha	1970-1983	XS650	35
Yamaha	1976-1981	XS750	38
Yamaha	1984-2009	XV series (Virago)	35-41 (varies by year and model)
Yamaha	2016-Present	XSR series (XSR700, XSR900)	52
Yamaha	1976-1989	XT500	38

Selecting the correct headlight mounting brackets based on your fork diameter is a crucial step in customizing your bike's front end. It ensures that your new headlight is securely mounted, providing a clean, professional appearance that complements your custom build.

There are a few other companies that have fantastic tools for identifying fork Diameter, check out ALL BALLS for their bearing identifier for your front end conversion.

Purpose Built Moto

Headlight Mounting Kit Black

$90.00

~~$90.00~~ $90.00

Em promoção Esgotado

Envio calculado na finalização da compra.

Fork Diameter 35-39 mm Front Forks 40-44 mm Front Forks 50-54 mm Front Forks

Variantes de produtos

Quantidade

Size and Fitment

Dimensions:

Minimum distance from front fork: 15mm
Maximum distance from front fork: 65mm

- Universal fit for motorcycles with fork diameters of 35-39mm, 40-44mm, and 50-54mm.
- Designed for a minimalistic look, allowing the headlight to mount close to the forks.
- Compatible with the Purpose Built Moto headlight range.
- Easy installation process, ideal for DIY projects and custom builds.

Technical Info

Purpose Built Moto Universal Headlight Mounting Kit: Custom Style, Unrivaled Fit

Sleek, Minimalist Design:

Dimensions: Minimum distance from front fork: 15mm, Maximum distance: 65mm.
Universal Fit: Adapts to fork diameters of 35-39mm, 40-44mm, and 50-54mm.
Color Variations: Available in classic black and stylish silver.
Exceptional Quality & Compatibility:

Purpose Built Moto Range: Tailored specifically for our headlight range.
Easy Installation: Quick bolt-on process, no cutting or welding needed.
Durable Construction: Designed to endure the toughest road conditions.
Enhanced Motorcycle Experience:

Improved Look: Ensures headlight sits close to forks, avoiding protrusion.
Versatile for Custom Builds: Ideal for DIY enthusiasts and custom motorcycle builders.
Optimized for Both 6V and 12V Systems: Ensures wide compatibility and functionality.
Premium Craftsmanship:

Expertly Engineered: Combining top-grade materials with precision design.
Vibration Reduction: Ensures stable and secure headlight mounting.
High-Grade Materials: Constructed for maximum reliability and long-term use.

Elevate your motorcycle's aesthetics with the Purpose Built Moto Universal Headlight Mounting Kit, the perfect blend of style, quality, and functionality.

Returns + Warranty

All products are backed by our 12 month manufacturers warranty and are sold with a 30 day return policy

For more information refer: Purpose Built Moto's warranties and returns policy

Ver detalhes completos

Purpose Built Moto

Headlight Mounting Kit Silver

$90.00

~~$90.00~~ $90.00

Em promoção Esgotado

Envio calculado na finalização da compra.

Fork Diameter 35-39 mm Front Forks 40-44 mm Front Forks 50-54 mm Front Forks

Variantes de produtos

Quantidade

Size and Fitment

Dimensions:

Minimum distance from front fork: 15mm
Maximum distance from front fork: 65mm

- Universal fit for motorcycles with fork diameters of 35-39mm, 40-44mm, and 50-54mm.
- Designed for a minimalistic look, allowing the headlight to mount close to the forks.
- Compatible with the Purpose Built Moto headlight range.
- Easy installation process, ideal for DIY projects and custom builds.

Technical Info

Purpose Built Moto Universal Headlight Mounting Kit: Custom Style, Unrivaled Fit

Sleek, Minimalist Design:

Dimensions: Minimum distance from front fork: 15mm, Maximum distance: 65mm.
Universal Fit: Adapts to fork diameters of 35-39mm, 40-44mm, and 50-54mm.
Color Variations: Available in classic black and stylish silver.
Exceptional Quality & Compatibility:

Purpose Built Moto Range: Tailored specifically for our headlight range.
Easy Installation: Quick bolt-on process, no cutting or welding needed.
Durable Construction: Designed to endure the toughest road conditions.
Enhanced Motorcycle Experience:

Improved Look: Ensures headlight sits close to forks, avoiding protrusion.
Versatile for Custom Builds: Ideal for DIY enthusiasts and custom motorcycle builders.
Optimized for Both 6V and 12V Systems: Ensures wide compatibility and functionality.
Premium Craftsmanship:

Expertly Engineered: Combining top-grade materials with precision design.
Vibration Reduction: Ensures stable and secure headlight mounting.
High-Grade Materials: Constructed for maximum reliability and long-term use.

Elevate your motorcycle's aesthetics with the Purpose Built Moto Universal Headlight Mounting Kit, the perfect blend of style, quality, and functionality.

Returns + Warranty

All products are backed by our 12 month manufacturers warranty and are sold with a 30 day return policy

For more information refer: Purpose Built Moto's warranties and returns policy