What is the most important thing to decide before starting a custom motorcycle build?

Decide how the bike will be used first. Whether it’s for city riding, cross-country touring, camping, or track riding, each purpose points toward different part choices. Once the bike’s intended use is clear, selecting the right components becomes much easier. The How to Build a Bobber guide is a solid starting point for the full build process.

How do I make my motorcycle faster?

Start with a free-flowing air filter and an exhaust system that is properly tuned for your carburetor or fuel injection setup. For greater performance gains, consider increasing engine displacement with a big bore kit and improving airflow with custom camshafts or cylinder head work. Since each modification builds on the previous one, tuning after every upgrade is important.

What should I change first to make my motorcycle more comfortable?

Focus on three key areas: the seat, footpeg position, and handlebar setup. Handlebar rise and pullback typically have the greatest impact on comfort, handling, and riding posture. Investing in a quality seat can also significantly improve comfort on long rides.

Are custom Harley parts compatible with all Harley-Davidson models?

No. Fitment depends on the specific part and model year. Harley-Davidson aftermarket parts are often designed for particular platforms such as Big Twin, Sportster, or Softail models, and compatibility can vary by year range. Always review the fitment information on the product listing before ordering, and contact the supplier if compatibility is unclear.

Custom Motorcycle Parts

Sort by

Custom Motorcycle Parts CATEGORIES

Closeouts

Air Intake & Fuel Systems

Brakes

Drivetrain & Transmission

Electrical & Wiring

Engine

Exhaust

Fenders

Frame & Chassis

Gas tanks

Gauges & Instruments

Handlebars & Controls

License Plates

Lighting

Oil Tanks

Seats

Sissy Bars

Suspension

Tires & Tubes

Wheels & Wheel Components

BEST SELLING BRANDS

TOP Custom Motorcycle Parts

Colony #3392-10 Handlebar Lever Mounting Screw Kit 1973-1981 Harley-Davidson Big Twin & Sportsters
1 review $7.49

Colony #3391-4 Handlebar Lever Mounting Screw Kit Pre-1972 Harley-Davidson Big Twin & Sportsters
$3.87

Reverb Inc. Reverb Vintage Style Cable Wrap - Red/White
5 reviews $30.53

Cycle Electric Generator DGV-5006H 6 Volt for 1936-1957 Harley-Davidsons w/Heli Coils
2 reviews $569.01 $609.10

Klock Werks Sport Flare Windshield - 6 inch - Black - 2015-Up Harley-Davidson FLTR Models
$199.95

Colony #3635-4 Kickstand Leg Stop Kit 1936-1984 Harley-Davidson Big Twins - Parkerized
$16.78

Colony #3633-2 Footpeg Rubbers 1952-1990 Harley-Davidson K/KH/XL 1971-1991 FX
$24.99

Colony #3632-10 Front Stand Catch Mounting Kit 1936-1948 Harley-Davidson Big Twins 1936-1957 Servi-Car 1936-1952 45's - Parkerized
$7.43

Colony #3630-3 Rear Brake Rod Spring Pull 1936-1937 Harley-Davidson Big Twins 1934-1936 WL 1934-1938 Servi-Car - Parkerized
$25.00

Colony #3621-4 Brake Light Switch Mounting Kit 1939-1957 Harley-Davidson Big Twins - Chrome Plated
$10.45

Colony #3619-1 Cylinder Bracket 1932-1950 Harley-Davidson 45's w/Cast Iron Heads - Parkerized
$45.00

British Standard Stainless Steel Finned Exhaust Pipe Clamp 1950-1971 Triumph Unit & Pre-Unit OEM #70-4501
5 reviews $124.64

FNA Custom Cycle Daytona Dental Mirror
1 review $59.00

The Speed Merchant Cruiser Foot Pegs - Raw
$152.96 $169.95

The Speed Merchant Cruiser Foot Pegs - Black
$157.46 $174.95

The Speed Merchant 49 mm Fork Preload Adjuster - Gold Finish
1 review $161.96 $179.95

The Speed Merchant 39 mm Fork Preload Adjuster - Gold Finish
$152.96 $169.95

The Speed Merchant 39 mm Fork Preload Adjuster - Raw Machined Finish
$143.96 $159.95

The Speed Merchant 39 mm Fork Preload Adjuster - Black Anodized Finish
$152.96 $169.95

Gasbox Full Rigid Chopper Frame 2004-2022 Harley-Davidson Sportsters - 3" Up - Sporty Tank Mounts
3 reviews $1,199.00

Drag Specialties Solo Seat - Smooth - 1982-2003 Harley-Davidson Sportster XL
$280.95

Drag Specialties EZ-On Solo Seat - Smooth - 1982-2000 Harley-Davidson FXR
$354.95

Drag Specialties Solo Seat - Smooth - 1958-1984 Harley-Davidson FX/FL
$362.95

Drag Specialties Solo Seat - Smooth - 1984-99 Harley-Davidson FXST/FLST
$353.95

Drag Specialties Low Profile Double Bucket 2-Up Seat - Smooth - 1982-2003 Harley-Davidson Sportster XL

$390.95

Drag Specialties Spoon Style 2-Up Seat - Smooth - 1957-78 Harley-Davidson Sportster XL
$354.95

Drag Specialties Predator III 2-Up Seat - Classic Stitch - 1982-2000 Harley-Davidson FXR
$422.95

Drag Specialties Predator III 2-Up Seat - Smooth - 1996-2003 Harley-Davidson FXD/FXDC/FXDL/FXDX/FXDWG
1 review $386.95

Drag Specialties Predator III 2-Up Seat - Classic Stitch - 1982-2003 Harley-Davidson Sportster XL
$389.95

Drag Specialties Predator III 2-Up Seat - Double Diamond - 1982-2003 Harley-Davidson Sportster XL
2 reviews $406.95

Drag Specialties Predator III 2-Up Seat - Smooth - 1982-2003 Harley-Davidson Sportster XL
$366.95

Drag Specialties Predator III 2-Up Seat - Double Diamond - 1957-78 Harley-Davidson Sportster XL
$413.95

Drag Specialties Predator 2-Up Seat - Smooth - 1982-2003 Harley-Davidson Sportster XL
$385.95

Drag Specialties Predator 2-Up Seat - Smooth - 1957-78 Harley-Davidson Sportster XL
$351.95

Drag Specialties Small Pillion P-Pad - Black - Smooth
$142.95

Cycle Standard Nose Cone Cam Gear Cover - Black- 1973-92 Harley-Davidson Big Twin
$179.25

Cycle Standard Nose Cone Cam Gear Cover - Black - 1993-99 Harley-Davidson Big Twin
$179.25

Cycle Standard Transmission Neutral Switch 2000-05 Harley-Davidson FXST FLST FLT 2000-04 FXD
$16.74

Cycle Standard Replacement Dished Sprocket - Black - 48 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL OEM #41470-73
1 review $69.89

Cycle Standard Tie Link - Chrome - 2004-Up Harley-Davidson Sportsters
2 reviews $60.26

Cycle Standard Rear Fender Strut Set - 1977-1984 Harley-Davidson FLH
$104.29

EBC Brakes Sintered Rear Brake Pads 1991-98 H-D FXD/FXDL/FXDWG 84-94 FXR L87-99 FXST/FXSTB/FXSTC/FXSTS/FLST/FLSTC/FLSTF/FLSTS
2 reviews $54.14 $56.31

Drag Specialties Organic Rear Brake Pads L1987-99 H-D XL 91-98 Dyna Glide 84-97 FXR 84-E87 FXST/FLST
$30.58

Drag Specialties Rear Brake Master Cylinder Assembly - Chrome - 2007-13 Harley-Davidson Sportster XL
$178.45

Drag Specialties Front Brake Master Cylinder Assembly - Black - Dual Disc 1982-85 Harley-Davidson Big Twin and Sportster XL
$312.65

Drag Specialties Front Brake Master Cylinder Assembly - Black - Single Disc 1982-85 Harley-Davidson Big Twin and Sportster XL
$312.65

Drag Specialties Front Brake Master Cylinder Assembly - Black - Dual Disc 1996-17 Models (EXCEPT 15-17 Softail, 08-17 Dressers, Trike, 04-17 XL)
$331.73

Drag Specialties Front Brake Master Cylinder Assembly - Black - 2015-17 Harley-Davidson FLS/FLSTC/FLSTF/FLSTFB/FLST/FXSB
$351.87

Drag Specialties Front Brake Master Cylinder Assembly - Chrome - 2015-17 Harley-Davidson FLS/FLSTC/FLSTF/FLSTFB/FLST/FXSB
$307.35

Drag Specialties Front Brake Master Cylinder Assembly - Black - 2014-21 Harley-Davidson FLHT/FLHR/FLHX
$326.43

Drag Specialties Front Brake Master Cylinder Assembly - Chrome - 2014-21 Harley-Davidson FLHT/FLHR/FLHX
$331.73

Drag Specialties Clutch Lever Assembly - Chrome - 2004-13 Harley-Davidson Sportster XL
$107.01

Drag Specialties Brake/Mechanical Clutch Controls Kit w/o Switches - Chrome - 2014-21 Harley-Davidson Sportster XL w/o ABS
$447.27

Drag Specialties Brake/Mechanical Clutch Controls Kit w/o Switches - Chrome - 2004-13 Harley-Davidson Sportster XL w/o ABS
$450.45

Drag Specialties Brake/Mechanical Clutch Controls Kit w/o Switches - Chrome - Dual Disc 1996-11 Harley-Davidson FXD/FXDWG 96-03 XL 96-07 FLHR 96-10 FXST/FLST
$416.53

Drag Specialties Brake/Mechanical Clutch Controls Kit with Switches - Chrome - Single Disc 1996-11 Harley-Davidson FXD/FXDWG 96-03 XL 96-07 FLHR 96-10 FXST/FLST
$655.03

Drag Specialties Brake/Mechanical Clutch Controls Kit w/o Switches - Chrome - 2011-14 FXS/FLS/FLST 11-13 FXCW/C 12-17 FXD/FXDWG
$437.73

Drag Specialties Brake/Mechanical Clutch Controls Kit - Black - 1999-07 Harley-Davidson FLT/FLHT
$374.13

Drag Specialties Brake/Mechanical Clutch Controls Kit - Black - 2008-13 Harley-Davidson FLT
$367.77

Drag Specialties Brake/Mechanical Clutch Controls Kit - Chrome - 2008-13 Harley-Davidson FLHX/FLHT/FLTR/FLHR
2 reviews $393.21

Drag Specialties Handlebar Switch Housing Kit - Chrome - 2014-20 Harley-Davidson FLHT/FLHX/FLHR
$113.37

Drag Specialties Brake/Hydraulic Clutch Controls Kit - Chrome - 2017-20 Harley-Davidson FLHT/FLHX/FLHR
$508.75

Lowbrow Customs Sportster Skid Plate - Stainless - Harley-Davidson Sportster 1991-2003
3 reviews $176.70

Burly Brand Rear Lowering Kit - Black - 2006-2017 Harley-Davidson FXD/FXDWG

$148.46 $164.95

Burly Brand Rear Lowering Kit - Black - 1985-1996 Harley-Davidson FLT

$120.56 $133.95

Drag Specialties Passenger Footpeg Mounting Kit - Black - 2018-21 Harley-Davidson Softails
$151.53

Drag Specialties Passenger Footpeg Mounting Kit - Black - 2004-2013 Harley-Davidson Sportster XL
$190.75

Drag Specialties Passenger Footpeg Mounting Kit 2014-2021 Harley-Davidson Sportster XL
$184.39

Drag Specialties Passenger Floorboard Mount Kit - Black - 2000-17 Harley-Davidson FXST/C, FLST/C
$333.85

Drag Specialties Passenger Floorboard Mount Kit - Chrome - 2000-17 Harley-Davidson FXST/C, FLST/C
$333.85

Progressive Suspension Monotube Fork Cartridge Kit - Standard - 2007 Harley-Davidson XL50 04-10 XL883C 04-09 XL1200R 06-07 XL883R
$316.95

Cycle Standard Headlight Visor - 5-3/4" Headlight - Chrome - Replaces OEM #69735-05
$37.64

CUSTOM MOTORCYCLE PARTS FOR HARLEY, TRIUMPH, AND BSA BUILDS The parts you choose define the bike. OEM keeps it stock. Aftermarket opens up fitment, finish, and function options the factory never offered. Whether you are sourcing a direct replaceme...

CUSTOM MOTORCYCLE PARTS FOR HARLEY, TRIUMPH, AND BSA BUILDS

The parts you choose define the bike. OEM keeps it stock. Aftermarket opens up fitment, finish, and function options the factory never offered. Whether you are sourcing a direct replacement for a worn component or tracking down a specific piece to finish a chopper or bobber build, the catalog here covers custom Harley parts, BSA, and vintage Triumph across hundreds of categories.

WHY BUILDERS GO AFTERMARKET

Stock parts do the job they were designed for. Aftermarket custom motorcycle parts do what the builder needs:

Fitment Where OEM Falls Short: Finding correct OEM components for older Harley Big Twin, BSA, or vintage Triumph motorcycle parts gets harder every year. Aftermarket and reproduction parts fill those gaps with components built to the same spec or better.
Material and Finish Options: Many aftermarket parts come in finishes the factory never offered, including billet aluminum, stainless, black oxide, and chrome. The part matches the direction of the build rather than fighting it.
Universal Parts for Custom Work: Raw, unfinished, and universal parts give you a starting point to cut, shape, and mount to your specific frame and geometry. That is something a stock replacement never offers, and it is where bobber motorcycle parts and chopper builds get interesting.
Cost and Availability on Older Platforms: For british motorcycle parts and vintage Triumph or older Harley platforms, reproduction aftermarket parts are often the more practical choice on both availability and price.

BRANDS AND WHAT WE STOCK

The catalog covers hardware, fabrication parts, engine components, controls, lighting, and everything in between. Key brands include Colony for hardware and fasteners and Mid-USA for drivetrain and engine components. Fitment data is listed on each product page. If you are not sure what fits your year and model, the team is reachable by chat, phone, or email.

Read less

Custom Motorcycle Parts FAQ

STAY CONNECTED
WITH LOWBROW

NO SPAM, EVER. JUST GREAT STUFF. YOUR INFO IS NEVER SHARED.