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

Gasbox Replacement Hardware for Lowbrow Customs Dished Clamp-On Steel Motorcycle Oil Tank
$0.85

Gasbox Replacement Hardware for Gasbox Bolt-On Oil Tank for Rigid Harley-Davidson Big Twin Frames 1936-57
$5.78

Gasbox Replacement Hardware for Gasbox Horseshoe Bolt-on Oil Tank for Harley-Davidson 1952-78 Harley Sportster XL
$19.55

Gasbox Replacement Hardware for Lowbrow Customs Weld-On Hardtail Frame for 2004-2022 Harley Sportster
$17.16

Gasbox Replacement Hardware for Lowbrow Customs KR Style Bolt-On Hardtails
$20.51

Gasbox Replacement Hardware for Gasbox "Lorain" Full Frames
$7.52

Gasbox Replacement Hardware for Gasbox 2004-2022 Sportster Full Frames
$31.65

Cycle Standard Chrome Axle Adjuster Spacers 2000-2007 Harley-Davidson FLST/FXST OEM# 47577-00
$29.99

Lowbrow Customs Axle Spacer Kit: OEM 39mm Trees / Lowbrow Tapered Lowers / Lowbrow Ribbed Spool Wheel
$22.87

Lowbrow Customs Rebuild Kit for Lowbrow Customs Four Piston Brake Calipers
$20.00

Lowbrow Customs Replacement Brake Pads for Lowbrow Customs Four Piston Brake Calipers
$25.00

Lowbrow Customs Four Piston Brake Caliper - Chrome
$249.00

Cycle Standard Replacement 41MM Fork Springs 1984-1999 Harley-Davidson FXST OEM# 46048-84
$44.99

Cycle Standard Shift Lever 2006-2011 Harley-Davidson Dyna - Chrome - OEM# 33883-06
$28.99

Cycle Electric Rectifying Regulator CE-602-08 - 2008-2016 Harley-Davidson Dyna Models
$231.04 $237.05

Cycle Electric Rectifying Regulator CE-602-06 - 2006-2007 Harley-Davidson Dyna Models
$231.04 $247.32

Cycle Electric Rectifying Regulator CE-601 - 2001-2006 Harley-Davidson Softail Models
$220.61 $236.16

Cycle Electric Rectifying Regulator CE-445 - 1995-1996 Harley-Davidson FLHYCUI/FLHTCI/FLCUI
$238.18 $254.96

Cycle Electric Rectifying Regulator CE-325L - 2000 Harley-Davidson FLST/FXST/Softail
1 review $164.50 $176.09

Cycle Electric Rectifying Regulator CE-207 - 1992-1993 Harley-Davidson XL Models
$165.98 $177.68

Cycle Electric Stator CE-6010 for 2001-2005 Harley-Davidson Softail 2004-2005 Dyna OEM# 30017-01
$119.49 $127.90

Cycle Electric CE-506 Replacement Regulator for DGV-5006 Generator
$200.46 $214.59

Cycle Electric CE-105-10 Replacement Regulator 1982-E1984 Harley-Davidson XLH/XLS w/model 65A Generator
$141.76 $151.74

Cycle Electric CE-102L Replacement Regulator 1936-1964 Harley-Davidson 12 Volt Conversion w/Battery in Oil Tank
$140.51 $150.41

Cycle Electric Generator DGV-5006 6 Volt for 1936-1964 Harley-Davidsons with 5/16-24 mounting bolts
$555.08 $594.19

Cycle Electric Generator DGV-2578 6 Volt for 1958-1964 Harley-Davidsons with 5/16-24 mounting bolts
$420.00 $449.60

Cycle Electric Generator DGV-2569H 65A 12v for 1936-1957 Harley-Davidsons with 1/4-24 mounting bolts
$422.79 $438.66

Cycle Electric Generator DGV-2569M 65A 12v for 1936-1957 Harley-Davidsons with 5/16-24 mounting bolts
$395.86 $423.75

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

S&S Cycle Quickee Adjustable Pushrod Set - 1991-2022 Harley-Davidson XL 1999-2017 Twin Cam 2017-2023 M8
$210.00

Haifley Seats Bates Style Pillion P-Pad - Horizontal Pleat - Black
$160.00

Haifley Seats Bates Style 1 inch Horizontal Pleat Solo Seat - Black
$300.00

James Gaskets Primary Cover & Inspection Cover Gasket Kit 8-Hole Primary Cover 1965-1969 Harley-Davidson Big Twins
$68.87

Cycle Standard Rebuild Kit for 14mm Solo Custom Mini Rear Brake Master Cylinder
$35.66

Axel Co. Nobody's 'Ol Lady Points Cover - Black - 1971-2003 Harley-Davidson Sportsters/Ironheads
$60.00

Axel Co. Nobody's 'Ol Lady Points Cover - Polished - 1971-2003 Harley-Davidson Sportsters/Ironheads
$60.00

Cannonball Gasket for Cannonball Heavy Duty Kickstarter Kit Cover
$19.99

Lowbrow Customs Brake Caliper Anchor Rod - 4 inch - Black
1 review $61.92

Dynatek Performance Electronics 2000I PC Programmable Electronic Ignition Kit for 1986-2003 Dual Plug Head Harley-Davidsons Sportster XL1200S models
$519.99

Drag Specialties Forward Control Kit With Pegs 1982-1994 & 1999-2000 Harley-Davidson FXR Models
$419.71

Cycle Standard Replacement Dished Sprocket - Black - 47 Tooth - 1973-1985 Harley-Davidson Big Twin 1979-81 XL
$71.89

James Gaskets Rocker Cover Gasket Kit 1992-1999 Harley-Davidson EVO Big Twins
$79.26

Drag Specialties Chrome Rocker Box Cover 1992-1999 Harley-Davidson EVO Big Twins
$386.85

Drag Specialties Chrome Transmission Top Cover 1987-1999 Harley-Davidson EVO Big Twins w/ 5-Speed Transmission
$86.95

Drag Specialties Custom Relay - Headlight
$41.68

Gasbox Full Rigid Frame 2004-2022 Harley-Davidson Sportsters - Sporty Tank Mounts
1 review $1,199.00

Gasbox Full Rigid Chopper Frame 1986-2003 Harley-Davidson Sportsters - 3" Up - Sporty Tank Mounts
$1,199.00

Prism Supply Co. Ripple Shift Knob - Polished Aluminum
$39.99

Cycle Standard Replica Rear Fender 1973-1978 Harley-Davidson XL
$138.17

Cycle Standard 12" Black Shocks With Black Spring - Stock Length - 1973-1984 Harley-Davidson FX/FXE 1972-1984 FL
$233.91

Cycle Standard 12" Chrome Shocks With Chrome Spring - Stock Length - 1973-1984 Harley-Davidson FX/FXE 1972-1984 FL
$233.91

Airspeed Cycles Wide Bottom Springer Ape Hanger Handlebars - 11 inch Rise - 1 inch - Stainless Steel
2 reviews $175.00

Drag Specialties Steel Clutch Plate Set L1984-1989 Harley-Davidson Big Twins
$39.17

Drag Specialties Aramid Fiber Clutch Plate Set L1984-1989 Harley-Davidson Big Twins
$90.05

Drag Specialties Fat Bob Flatside Style Gas Tanks - 1984-1999 Harley-Davidson FXST/FLST 1985-1986 FX/FXWG - 3.5 Gallon
$358.23

Drag Specialties 49mm Lower Fork Slider Bushing 2006-2017 Harley-Davidson Dyna 16-22 XL1200X/XS 14-17 FXSB 14-16 Dresser OEM# 4608001
$16.00

Drag Specialties 49mm Upper Fork Slider Bushing 2006-2017 Harley-Davidson Dyna 16-22 XL1200X/XS 14-17 FXSB 14-16 Dresser OEM# 4651601
$18.14

Drag Specialties 41mm Lower Fork Slider Bushing 1984-2010 Harley-Davidson FXST/C 1993-2005 FXDWG 86-17 FLST 84-13 FLHT 11-13 FXS OEM# 45866-84
$16.00

Drag Specialties 41mm Upper Fork Slider Bushing 1984-2010 Harley-Davidson FXST/C 1993-2005 FXDWG 86-17 FLST 84-13 FLHT 11-13 FXS OEM# 45940-84
$16.00

Drag Specialties 35mm Lower Fork Slider Bushing 1984-1987 Harley-Davidson FX/FXE/FXR 84-87 XL OEM# 45416-84
$14.93

Colony #3788-16 Battery Box Mounting Kit 1929-1952 Harley-Davidson 45s - Parkerized
$35.00

Colony #3787-16 Battery Box Mounting Kit CP Bolts 1929-1952 Harley-Davidson 45s - CAD Plated
$35.00

Colony #3786-16 Battery Box Mounting Kit CP Bolts 1929-1952 Harley-Davidson 45s - Parkerized
$35.00

Colony #3800-24 OEM Style Valve Cover Screw 1948-1950 Harley-Davidson Panhead
$22.00

Colony #3801-17 Timing Cover Screw Kit 1932-1936 Harley-Davidson RL/RLD/RLE/Servi-car - CAD Plated
$20.35

Colony #3736-2 Air Cleaner Cover Mounting Screw Kit 1983-Up Harley-Davidson Big Twins - Chrome
$16.50

Colony #3808-1 Steering Damper Friction Washer 1952-1966 Harley-Davidson K/KH/XL/XLH/XLCH
$15.40

Colony #3795-2 Cam Shaft Lever Screw & Nut Kit 1934-1936 Harley-Davidson RL/VL/Servi-car
$15.40

Colony #3737-2 Air Cleaner Cover Mounting Screw Kit 1983-Up Harley-Davidson Big Twins - Zinc Plated
$13.20

Colony #3802-5 Stoplight Switch Gasket 1939-1957 Harley-Davidson - 5 Pack
$12.38

Colony #3797-4 Exhaust/Saddlebag Spacers 1954-1957 Harley-Davidson - 4 Pack - CAD Plated
$10.89

Hawg Supply Swirl 4" Air Cleaner S&S Super E/G Carburetor - Brushed Aluminum
3 reviews $189.99

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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