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 #9818-5 Rear Disc Brake Rotor Torx Bolt Kit 1997-Up Harley-Davidson W/Cast Wheel - Chrome Plated
18 reviews $15.13

Cycle Standard Tail Light Screws for 1973-Up Harley-Davidsons - Replaces OEM #68026-73
4 reviews $21.14

Colony #2717-20 Valve Spring Cover Kit 1942-1973 Harley-Davidson 45s - CAD Plated
4 reviews $105.60

Kickstart Cycle Supply Kickstart Electrical Test Light
11 reviews $35.14

Lowbrow Customs Throttle Housing 1981-1995 Harley Thread-In Dual Cable - Black - 1 Inch
8 reviews $105.15

Mooneyes MOONEYES Spark Plug Wire Kits - Yellow
3 reviews $35.00

Gasbox Drag Pipe Exhaust Clamp for 1952 - 1985 Harley-Davidson XLR Models - Stainless Steel - OEM #65513-53
2 reviews $15.00

Colony #8873-18 Saddle to Seat Tree Mounting Kit 1934-1980 Harley-Davidson Models (Except FX/XL) - CAD Plated
1 review $35.00

Prism Supply Co. Prism Supply Co. 2-Piece Tail Light - Brass
1 review $104.99

Prism Supply Co. Prism Supply Bell Tail Light - Gloss Black
$104.99

Prism Supply Co. Prism Supply Co. 1.85 inch Speedster Tail Light - Gloss Black
2 reviews $104.99

Prism Supply Co. Prism Supply Co. 1.25 inch Speedster Tail Light - Gloss Black
1 review $104.99

Prism Supply Co. 22mm Petcock - Brass
4 reviews $104.99

Prism Supply Co. Ratchet Top Shifter Plate - Stainless Steel
$34.99

Drag Specialties Single Gauge Bracket - Chrome - 1995-2011 Harley-Davidson XL883 1995-2005 FXD Models
$104.89

Gasbox Starter Block Off Plate with Ignition Switch Mount for 1970 - 1985 Harley-Davidson Ironhead Sportsters
6 reviews $34.95

Lowbrow Customs Clutch / Brake Cable Clamp - Black - for 1 inch Frame Tubing
4 reviews $14.97 $18.27

Cycle Standard Throttle Idle Cable OEM #56401-96 Harley Sportster XL 1996-Up - Blacked Out
6 reviews $26.19 $37.41

Cycle Standard Headlight Visor - 5-3/4" Headlight - Chrome - Replaces OEM #69738-05
1 review $52.35

EBC Brakes Sintered Rear Brake Pads 2008-17 H-D FLD/FXD/FXDC/FXDF/FXDWG/FXDB/FXDL 08-17 FLS/FXS/FXSTB/FXSTC/FLSTC/FLSTF/FLSTN/FXCW/C
1 review $52.32 $54.39

James Gaskets Cam Change Gasket Kit - 2000-03 Harley-Davidson Sportster XL
2 reviews $26.16

Colony #2879-1 Clutch Hole Adjusting Filler Cap 1977-1985 Harley-Davidson Sportster
2 reviews $20.90

Colony #7811-14 Inner Primary Mounting Kit - 1936-1954 Harley-Davidson Knucklehead/Panhead
1 review $26.08

Colony #8931-16 Rocker Cover Allen Head Screw Kit 1985-Up Harley-Davidson FL/FX 1986-Up XL - Chrome Plated
3 reviews $20.85

Cycle Standard 5 Post Ignition Key Switch Replaces Harley-Davidson OEM #71500-36T - Black Bezel
10 reviews $51.91

Goodridge Universal Braided Stainless Brake Line - 12" - Ebony
$25.95

British Standard Clutch Cable Triumph 1965-1967 650 Twins 1966-1974 500 Twins UK Made OEM #60-1994 60-0565
7 reviews $51.84

Cycle Standard Drilled Black Brake & Clutch Lever Set for Harley 96-03 Sportster and 96-06 Big Twins
24 reviews $51.80

Lowbrow Customs Cole Foster Grips Mocha Marble 1 inch
59 reviews $25.87

Colony #3561-1 Stem Crown Nut 1939-1948 Harley-Davidson Big Twin Springer - Parkerized
$51.70

Cycle Standard Black OEM-Style Shift Lever - 1991-2005 Harley-Davidson Sportster Models
$25.80 $35.42

Colony #2866-1 Rear Axle Spacer 1936-1957 Harley-Davidson Big Twins - Parkerized
$20.57

Drag Specialties Breaker Plate Assembly 1970-1999 Harley Davidson Big Twin 1971-2003 XL Points Ignition (Except Single Fire Ignition)
$17.12

Drag Specialties Points & Condenser Kit 1948-1969 Harley-Davidson Big Twin 1957-1970 XL
$17.07

Cycle Standard 3-1/2 inch diameter Chrome Bottom Mount Headlight
15 reviews $102.36

Colony #3339-1 Linkert Carburetor Fitting for 1/4 inch Fuel Hose - CAD Plated
2 reviews $7.87

Cycle Standard Clutch Cable OEM #38699-04 2004-Up Harley-Davidson Sportster XL - Blacked Out
6 reviews $51.13 $73.04

Colony #8603-8 Adjustable Pushrod & Solid Lifter Kit 1984-Up Harley-Davidson Evo
2 reviews $102.11

Prism Supply Co. Weld-On Stainless Steel Light Mount With License Plate Bracket - Prism Supply Co. PS-41 Tail Light
$33.99

Colony #2724-10 10mm Brake Line Banjo Bolt Crush Washers 2008-Up Harley-Davidson Touring 2006-Up VRSC - 10 pack
7 reviews $14.52

Colony #8909-13-P Transmission Side Cover Smooth Allen Kit 1987-2006 Harley-Davidson FX/FL/Softail 1991-2005 Dyna - Chrome Plated
$33.84

Cycle Standard Throttle Idle Cable OEM #56309-96 Harley Sportster XL 1996-2001 +4 inch Extended
5 reviews $33.81

Colony #3167-4 Shock Mount Bolt Kit 1984-99 Harley Davidson Softail — Colony #3167-4 Shock Mount Bolt Kit 1984-1999 Harley-Davidson Softail - Zinc Plated
4 reviews $25.30

Colony #2867-1 Rear Axle Spacer 1936-1957 Harley-Davidson Big Twins - Chrome Plated
$25.30

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1989-1999 Harley-Davidson FXST/FLST 1991-1998 FXD
1 review $25.29

Bates CV Carb Idle Adjuster Screw - Long
10 reviews $50.54

Mooneyes Yellow Moon Air Valve Caps
11 reviews $11.20

Cycle Craft 12 volt Ignition Coils - Pair - Lucas style
7 reviews $100.79

Cycle Standard Stainless Steel Exhaust Clamps 1-1/2 inch - Made in the USA
10 reviews $33.56

Lowbrow Customs Triumph Oil Feed Chrome Rocker Box Acorn Nuts and Copper Washers #70-1435 70-1335
12 reviews $33.42

Cycle Standard Clutch Cable OEM #38618-52 1952-1967 Harley-Davidson FL/EL +8 inch Extended
$33.39

Autolite Spark Plug- 1979-1985 Sportster XL - Manufacturer Part #4123
4 reviews $7.70

Forever The Chaos Life FTCL - Weld-on SHoRTi Passenger Foot Rests: 1” Coped Version
$50.00

Colony #3144-13 Transmission Kicker Cover Stud Kit 1936-84 Harley Davidson Big twins — Colony #3144-13 Transmission Kicker Cover Stud Kit 1936-1984 Harley-Davidson Big Twins - CAD Plated
3 reviews $25.00

Prism Supply Co. Prism Supply Co. Stainless Steel Flat Tail Light - Weld-On
1 review $99.99

Prism Supply Co. Prism Supply Co. Stainless Steel Ripple Flat Tail Light - Weld-On
$99.99

Forever The Chaos Life FTCL - SHoRTi Foot Pegs - 7075 Aluminum - Black Anodized
$99.95

Forever The Chaos Life FTCL - SHoRTi Foot Pegs - 7075 Aluminum - Raw Machined Finish
$99.95

Gasbox Exhaust Clamp 4 Piece Set 1947 - 1957 Harley-Davidson Panhead - Parkerized OEM #47-57 CL HDW
1 review $49.95

Gasbox Box Tail Light Universal Fender Mount Bracket - Stainless Steel
5 reviews $24.95

Cycle Standard Braided Stainless Cut-To-Length Compression Brake Line - 6' - Clear Coating
2 reviews $49.89

Blue Streak High-Performance Points - 1970-79 Harley-Davidson
3 reviews $19.95

British Standard Chrome Exhaust Mounting Brackets Triumph Motorcycles OEM #70-6857
15 reviews $33.20

Drag Specialties Shifter Linkage - Chrome - 15.5 inch - Custom Applications
3 reviews $49.77

Lowbrow Customs Stainless Steel Solo Seat Hinge / Pivot Bracket - 1963-70 Triumph
15 reviews $99.31

Fiorucci Fabrications The 99P Foot Peg Set
$99.00

Lowbrow Customs Radius Breather Bolts for Harley-Davidson Twin Cam - Black ED
16 reviews $49.49

Prism Supply Co. Handlebar 1 inch Grip Collar - Brushed Brass
$32.99

Prism Supply Co. Handlebar 1 inch Grip Collar - Polished Aluminum
$32.99

Lowbrow Customs Finned Heat Shield, 12 inch
30 reviews $98.64

Colony #9927-28 Upper & Lower Motor Mounting Allen Kit 1984-1999 Harley-Davidson Softail - Chrome Plated
$49.25

Lowbrow Customs Solo Seat Springs - Barrel Style - 3 inch Chrome
38 reviews $24.60

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.