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.

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BEST SELLING BRANDS

TOP Custom Motorcycle Parts

Lowbrow Customs 7mm 90 Degree Spark Plug Wire Sets - Clear Translucent
2 reviews $30.02

Cycle Standard Replacement Chain Conversion Sprocket - Chrome - 48 Tooth - Harley-Davidson Sportster 2000-Up Dyna 2006-Up
$75.02

Prism Supply Co. Bristol Breather - CV Carburetor - Polished
$60.00

Haifley Seats Bates Style 1 inch Tuck-n-Roll Solo Seat - Black
4 reviews $300.00

Prism Supply Co. Derby Cover Foot Clutch Kit - Tumbled Cover - 1994-2003 Harley-Davidson Sportster
1 review $299.99

Hawg Supply No Mess Oil Drain Valve For Harley-Davidson 5/8-18 thread
1 review $59.99

Mullins Chain Drive Richmond Spool Hub - Polished
1 review $299.95

Forever The Chaos Life FTCL - SHoRTi Foot Pegs - 7075 Aluminum - Black Anodized - Deluxe Weld-on Kit
$149.95

Forever The Chaos Life FTCL - SHoRTi Foot Pegs - 7075 Aluminum - Raw Machined Finish - Deluxe Weld-on Kit
$149.95

Gasbox Complete Hardware Kit for Gasbox Rigid Big Twin Frames with Frisco Tanks
$99.95

Prism Supply Co. Prism Supply Co. Steel Ripple Flat Tail Light - Weld-On
7 reviews $99.95

Goodridge P6150-03C 150 Degree Tube Adapter - Stainless Steel
2 reviews $49.95

Gasbox Front Motor Mount Plates - Stainless Steel - 1957 - 1981 Ironhead Sportster
9 reviews $49.95

Gasbox Top Motor Mount - 2007-up Harley-Davidson Sportster - With EFI Coil and Stock Ignition Switch Mounts
11 reviews $49.95

Cycle Standard 14 Piece Aluminum Wheel Axle Spacer Kit - 1.25 inch O.D. x 3/4 inch I.D.
34 reviews $59.92

Lowbrow Customs PVC Spacer Kit For Extended 39mm Fork Tubes
1 review $14.26

Bare Knuckle Performance 39mm Narrow Glide "The Clinch" Fork Brace - Gloss Black
1 review $299.00

Lowbrow Customs Weld-On Upper Fender Mount Tab for Flat and Trailer Motorcycle Fenders
40 reviews $17.58

Lowbrow Customs Motorcycle Inspection Sticker Mounting Plate 4.25 x 3 inches - Black Aluminum
15 reviews $22.85

Fiorucci Fabrications The "99" Foot Peg Set
$99.00

Prism Supply Co. Weld-On Steel Light Mount With License Plate Bracket - Prism Supply Co. Box Chopper Tail Light
2 reviews $26.99

Lowbrow Customs Rear Motor Mount Plates for Triumph Motorcycles - Chopper Style w/ Key Switch Hole - 1963 - 1970 Triumph
13 reviews $74.20

Morris Magneto Replacement Bakelite Magneto Cap - Clear
1 review $49.39

Cycle Standard Mesh Air Cleaner - Black - Harley-Davidson CV Carb Sportster and Big Twin
30 reviews $98.65

Colony #8301 PARK Complete Stock Hardware Kit - 1940-1947 Harley-Davidson Knucklehead - Parkerized
1 review $295.30

Cycle Standard Clutch Cable OEM #38619-71B Harley Sportster XL 1971-1985 +4 inch Extended
3 reviews $36.83

Kustom Tech Handlebar Grip Trim Rings - Chrome - 1 inch Bars
6 reviews $58.87

Goodridge Universal Braided Stainless Brake Line - 40" - Ebony
7 reviews $41.95

Lowbrow Customs Classic Grips - Metalflake Black - 1 inch
45 reviews $18.29

EMGO Aris Style Triangular Headlight - Black with Chrome Bezel
8 reviews $97.50

Cycle Standard 1/4 inch Braided Stainless Fuel Line Kit
8 reviews $48.71

Lowbrow Customs ECM Fender Mount Box for 2007-2013 Harley-Davidson Sportsters
$58.41

Cycle Standard Paradox Red/Amber LED Tail Light / Turn Signals - Smoke Lens - Black
19 reviews $145.72

Cycle Standard 1/4 inch NPT Lever Petcock - Solid Brass
35 reviews $26.49

Cycle Standard Round Motorcycle Mirror - Clamp On - Chrome with Retro Blue Glass
26 reviews $41.50

Colony #8793-5 Disc Front Brake Rotor to Hub Torx Screw Kit 1984-Up FX/FXR/FLT/XL - Chrome Plated
11 reviews $14.52

Cycle Standard Oil Temperature Dipstick OEM #62668;828-87 Harley-Davidson 1984-99 Softail FXST FLST 1979-2003 XL
29 reviews $36.28

S&S Cycle Accelerator Pump Rebuild Kit - S&S Cycle Carburetors #11-2918
11 reviews $28.95

Lowbrow Customs Brass Gas Filler Cap with Weld-In Steel Bung - Vented
10 reviews $57.82

8mm Suppression Core Cloth Spark Plug Wire Sets - Oak with Red and Black tracers — Lowbrow Customs 8mm Cloth 90 Degree Spark Plug Wire Sets - Oak with Red and Black tracers
39 reviews $36.03

Mid-USA Springer Neck Stem Nut - .315" Short - Chrome
$28.80

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

EMGO Finned Exhaust Pipe Clamps 23 Fins unit pre unit Triumph OEM #70-4501 1950-1971
13 reviews $71.85

Lowbrow Customs T-Bars Handlebars - 10 inch Rise - 1 inch Diameter - Black
25 reviews From $142.92

FNA Custom Cycle FNA Mini Far-E Headlight - Amber Lens
$285.71

Goodridge 90 Degree 3/8 inch/10mm Banjo Fitting - Stainless Steel
$21.95

Mid-USA Hardbody Slim Style Control Kits for Antique Springers - Black
1 review $113.96 $142.45

Colony #2107-16 Gas Tank Mounting Kit - 1996-2003 Harley-Davidson Sportster - Chrome Plated
6 reviews $40.61

Cycle Standard Universal Weld-On Kickstand with Internal Spring - for 1 inch tubing - Chrome
10 reviews $140.75

Cycle Standard Transmission Sprocket .5" Offset - 24 Tooth - 1991-2006 Harley-Davidson XL 1986-2006 Big Twin 5-Speed
$70.34

No School Choppers 1928 - 1932 Ford Duolamp - Original Red Lens - Model A stainless steel Tail Light
26 reviews $56.16

No School Choppers 1933 - 1936 Ford Blacked Out Tail Light for your bobber or chopper
39 reviews $56.16

Drag Specialties Clutch Cable OEM #38618-68C Harley-Davidson 4 Speed Big Twin 1968-1986
$56.13

Motone Screw-In Billet Adapter for 2.5" Monza Gas Cap for 1996 & later Harley-Davidson
5 reviews $56.08 $69.64

Lowbrow Customs Throttle Housing 1981-1995 Harley Thread-In Dual Cable - Aluminum - 1 Inch
5 reviews $93.46

Cycle Standard Prime 1 inch Handlebar Switch Kit - Single Mini Switch - Black
8 reviews $93.39

Gasbox Front Exhaust Pipe 1948-1965 Harley-Davidson Panhead - Chrome - OEM #65440-48
2 reviews $70.00

LCFabrications "The OG" Brake Switch Pod Delete - Polished - for Harley-Davidson
16 reviews $35.00

Prism Supply Co. "Super Prism" Throttle Cable for Prism Throttle Assemblies - 40 inch
$69.99

Cycle Standard Gas Tank Mounting Kit 1986-2003 Harley Sportster Rubber Mounted Tanks
$27.99

Pingel 3/8 inch NPT Power-Flo Petcock - Round Body - Chrome - Forward
$139.95

Goodridge 3/8-24 inch Single Banjo Bolt - Stainless Steel
5 reviews $7.95

Lowbrow Customs Lowbrow Fuel Reserve Bottle
145 reviews $27.82

Lowbrow Customs Lowbrow Customs 8mm Universal Spark Plug Wire Set
$25.29

Cycle Standard Heavy Duty Chrome Kicker Lever 1936-1977 Harley-Davidson Big Twin 1957-1976 XL
8 reviews $69.49

Drag Specialties Gas Tank with Aero-Style Gas Cap - 1995-03 Harley-Davidson Sportster - 3.3 Gallon
$277.67

Cycle Standard Ignition Advance Unit WIth Bolt 1970-Up Harley-Davidson OEM# 3251770T
4 reviews $39.42

Drag Specialties 4-1/2 inch Pullback Handlebar Riser Set - Black
$137.75

Cycle Electric LeBeef CE-500L-CP Replacement Regulator for DGV-5000L Generator
3 reviews $274.66 $294.02

Lowbrow Customs Dual 4-1/2 inch Bottom Mount Headlight Bracket - Harley Narrow Glide, Triumph, BSA - Tumbled Stainless
5 reviews $45.76

Lowbrow Customs Bottom Mount Headlight Bracket - Harley Narrow Glide, Triumph, BSA - Tumbled Stainless
7 reviews $45.76

Cycle Standard Laredo Gas Tank - Center Filler
3 reviews $274.30

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.

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