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

Cycle Electric Rectifying Regulator CE-211 - 2007-2008 Harley-Davidson XL Models
$166.67 $178.41

Lowbrow Customs 39mm Solid Riser Bushings for Harley-Davidson - Black
22 reviews $36.98

Colony #1013 Complete Show Bike Kit Allen Knurled Hardware 1994-2003 Harley-Davidson Sportster - Chrome Plated
2 reviews $166.28

Goodridge Universal Braided Stainless Brake Line - 24" - Ebony
5 reviews $36.95

Cycle Standard Chrome 12V Coil 1947 & Up Harley-Davidson
6 reviews $66.20

EMGO 6 volt Ignition Coils - Pair - Lucas style Triumph / BSA / Norton OEM #45275
41 reviews $110.21

Cycle Standard Wagner Lockheed Type Rear Drum Brake Master Cylinder - Chrome - 1958-1972 Harley-Davidson FL 1971-1972 FX
$110.07

Lowbrow Customs Wheel Bearing Adapter Tophats 3/4" to 5/8" - Pair
$16.50

Old-Stf Cycle Old-STF Cycle Shovelhead Aluminum Carburetor Intake Support Bracket
$66.00

Colony #3081-7 Seat Spring Upper and Lower Set 1936-1957 Harley-Davidson Rigid Big Twin
3 reviews $82.50

LCFabrications Harley Davidson Electronic Speedometer Sensor Delete - Eliminator
14 reviews $30.00

Hawg Supply Ratchet Top Shifter - Bend-Back
1 review $109.99

Colony #2012-8 Head Bolt Set 12 Point 1992-Up Harley-Davidson Big Twin 1993-Up XL - Chrome Plated
5 reviews $109.99

Old-Stf Cycle Aluminum KR Bee Blocker - SS Screen - S&S Super E/G Carburetor Velocity Stack
4 reviews $164.95

Progressive Suspension Drop-In Front Fork Lowering Kit - fits 1988-2015 Harley-Davidson Sportster XL Models
1 review $164.95

Cycle Standard Direct OEM Replacement Chrome Oil Tank for 1965-1982 Harley-Davidson 4 Speed Models
2 reviews $164.94

Gasbox Battery Box Adapter Plate for Gasbox Full Frames
10 reviews $29.95

Colony Axle / Wheel Spacer Plain 1-1/2 OD x 3/4 ID x .440 thick Harley-Davidson #47577-00 — Colony #47577-00 Axle/Wheel Spacer Plain 1-1/2 OD x 3/4 ID x .440 Thick
$20.57

Colony #8309 PARK Complete Stock Hardware Kit - 1937-1973 Harley-Davidson 45 with Aluminum Head - CAD Plated
$328.94

Cycle Standard Chrome Headlight Eyebrow Visor for Harley Sportster FX FX FXR - No Indicator Light Mounting Holes
2 reviews $54.76

Cycle Standard Throttle Cable OEM #56308-88 Harley Sportster XL 1988-1995 +4 inch Extended
4 reviews $32.82

Cycle Standard Z Bar Handlebars - 1 inch - 2 inch Rise - Chrome
7 reviews From $109.34

Cycle Standard Oil Temperature Dipstick OEM #62635-79 Harley-Davidson 1970-84 Big Twin 1984-94 FXR 1987-92 FLT 1970-78 XL
12 reviews $36.37

Lowbrow Customs Pursuit Foot Peg Set - Raw Aluminum
18 reviews $108.93

Cycle Standard Z Bar Handlebars - 1 inch - 4 inch Rise - Black
23 reviews From $108.62

Colony #2548-8 Clutch Hub Nut Kit 1941-1984 Harley-Davidson Big Twin - Parkerized
16 reviews $25.00

Mooneyes 3 quart Traditional Chopper Oil Tank for Harley-Davidson Choppers
9 reviews $325.00

Prism Supply Co. Cast Aluminum LED License Plate Frame - Polished
$64.99

Cycle Electric Stator CE-8010-07 for 2007 Harley-Davidson Dyna/Softail OEM# 30017-07
$161.99 $173.40

Goodridge PMCHD-016C 1/8 inch NPT Universal Rear Junction Block with Brake Light Switch Mount - Stainless Steel
4 reviews $80.95

Led Sled Customs Stainless Steel Universal Kickstand with Internal Spring - for 1 inch tubing
3 reviews $161.43

Coker Tire Beck Classic Motorcycle Tire 5.00-16
2 reviews $322.32

Cycle Electric Rectifying Regulator CE-205 - L1984-1990 Harley-Davidson XL Models
$160.09 $171.37

Haifley Seats Bates Style Pillion P-Pad - Tuck-n-Roll - Black
6 reviews $160.00

Lowbrow Customs Belt To Chain Conversion Kit 1995-1999 Harley-Davidson Softail - Black Sprocket
$159.99

Kenda Tires Motorcycle Tire Inner Tube - 4.00 / 4.50-19 inch Center Metal Valve
1 review $15.99

Cycle Standard 49mm Fork Leg Assembly Rebuild Kit 2006-2017 Harley-Davidson Dyna Glide Models w/8mm and 14mm Damper Bolts
$106.55

Drag Specialties Billet Flange Carb Adapter - Mount Mikuni or CV carb to Harley-Davidson Evo Big Twin/Panhead/Shovelhead/Ironhead Models
13 reviews $45.46

LePera Bare Bones Solo Seat - Smooth - fits 1984-1999 Harley-Davidson Softail
1 review $318.00

Cycle Standard Baffles for 1-3/4 inch Exhaust Pipes - Universal - 4 inch
43 reviews $17.66

Bates CV Carb Choke Relocation Bracket - fits Harley Sportster, Dyna, FXR, Softail
22 reviews $18.63

Kustom Tech 11 inch Ribbed Rigid Struts - Chrome
$316.44

Cycle Standard Super E Carburetor Rebuild Kit
3 reviews $105.48

Cycle Standard Primary Chain Adjuster Kit - 1965-2000 Harley-Davidson Big Twin
3 reviews $78.99

Lowbrow Customs Rear Caliper Bracket for Rigid Harleys - 10" Rotor - 3/4" Axle - Raw
$105.15

Lowbrow Customs Throttle Housing 1981-1995 Harley Thread-In Single Cable - Black - 1 inch
7 reviews $105.15

Goodridge Universal Braided Stainless Brake Line - 38" - Ebony
7 reviews $44.95

Cycle Standard Exhaust Port Gaskets - 1966-1984 Harley-Davidson FX/FL OEM# 65843-68A - 2 Pack
$12.10

EMGO Fork Tubes 1963 - 67 Triumph Motorcycles 500 / 650 c.c. #97-1889
6 reviews $156.98

Cycle Standard Sintered Metal Rear Disc Brake Pads for 1987-1999 Harley-Davidson Sportster Models OEM #44209-87
5 reviews $52.15

Cycle Standard +4 inch Extended Clutch Cable OEM #38619-86A Harley 883 Sportster XL 1986-2003
10 reviews $51.77

Morris Magneto "KATT" Magneto Timing Tool
3 reviews $103.16

Colony #8302 CHR Complete Stock Hardware Kit - 1948-1957 Harley-Davidson Panhead - Chrome Plated
$308.88

Pro One Performance Products Hidden/Internal Stop Fork Neck Cup Kit
5 reviews $154.14

British Standard Triumph Neck Bearing Conversion Kit - Fit Harley or Springer Front End to 1956-1970 Triumph 650 1967-Up 500
34 reviews $77.04

Cycle Standard Sprocket Cover - Polished Aluminum - 1991-2003 Harley-Davidson Sportster OEM #34911-91
42 reviews $102.67

Shinko Motorcycle Tires Classic 240 Whitewall Front/Rear Motorcycle Tire - MT90-16 74H
$153.95

Goodridge Universal Braided Stainless Brake Line - 16" - Ebony
2 reviews $27.95

Cycle Standard Rear Motor Engine Mount 1967-1981 Harley Davidson Ironhead Sportster OEM #16203-67
4 reviews $102.21

Cycle Standard Drilled Stainless Steel Brake Rotor - 11.5 inches - Rear - Replaces Harley-Davidson OEM #41789-92
$102.14

Lowbrow Customs Rogue Rear Fender Strut Set 1958 - 1984 Harley-Davidson Panhead Shovelhead
17 reviews $101.87

Lowbrow Customs Brass Gas Filler Cap - Vented
7 reviews $43.59

Bates CV Carb Idle Adjuster Screw - Short
11 reviews $50.69

Cycle Standard Replacement Chain Conversion Sprocket - Chrome - 55 Tooth - Harley-Davidson Sportster 2000-Up Dyna 2006-Up
$75.94

Colony #3252-6 Locking Exhaust Pipe Bolt Kit 1966-1984 Harley-Davidson Shovelhead - Chrome Plated
8 reviews $27.50

Cycle Standard Rim Strip for 21 inch Motorcycle Wheels
29 reviews $4.03

Cycle Standard Asphalt Wire Loom - 10 foot x 1/4 inch
28 reviews $23.24

Lowbrow Customs Locking Tab Washer for Harley-Davidson Rear Wheel Pulley / Sprocket - Tumbled Stainless
24 reviews $12.57

Cycle Standard Replica Rear Fender 1959-1972 Harley-Davidson Ironhead XL
$150.82

Lowbrow Customs Aluminum Gas Filler Cap with Weld-In Steel Bung - Vented
9 reviews $50.19

Cycle Standard Replacement Chain Conversion Sprocket - Black - 52 Tooth - Harley-Davidson Sportster 2000-Up Dyna 2006-Up
$75.24

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.