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 |
| 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
Scheinwerfer-Montagesatz Schwarz
Normaler Preis
$90.00
Normaler Preis
Verkaufspreis
$90.00
Grundpreis
pro
Purpose Built Moto
Scheinwerfer-Montagesatz Silber
Normaler Preis
$90.00
Normaler Preis
Verkaufspreis
$90.00
Grundpreis
pro
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