Introduction
If you’re a truly big fan of motorcycles, you might not be just a driver but also a creator or at least a repairer. For those interesting in motorcycle building, this post is worth to take a look. In particular, what I’m going to show you is how to build a motorcycle frame from scratch.
All the detailed steps of construction are represented in a neat, informative and comprehensive way so that you can capture all the pieces of information quickly and easily. What’s more? I will take you to a further step with how to build a brat style bike.
Once you had a frame, it’s time to create your own motorcycle. I choose the brat style bike as an example. Finally, I will show you how to build a sidecar for a motorcycle. This is even a further step, offering you a great shelter to carry goods and friends.
How To Build A Motorcycle Frame From Scratch
Step 1: Select the Style of the Frame

A chopper frame
When it comes to choosing what styles of motorcycle frames, you first need to determine what kind of motorcycle you’re going to produce. Two most common frame styles for motorcycles are sport bike frames and chopper frames.
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- ✔ Fits all standard motorcycle license plates 7" x 4"
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- Black Motorcycle Stainless Steel License Plate Frame
- Made of high quality 304 Stainless steel. Universal Fit and Easy Installation.
- Includes Stainless Steel M6x20mm screws, nuts and Black screw caps.
- Fits all standard motorcycle license plates 7" x 4"
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- Might not fit if you have a tail light below license plate
- Not compatible with Minnesota state license plates
- Premium Quality Anodized Aluminum Motorcycle License Plate Frames
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- Quality silicone material: The black silicone License plate frame is made from industrial-grade silicone, which prevents scratches compared to most metal License plate frame and does not deform over time
- Clever design: Motorcycle silicone license plate holder. There are four drain holes to release the water. Even if it's pouring rain and there's no worry about rusty license plates
- Why it's great: Silicone license plate frames are resistant to rust and rain and No vibration. Long-term exposure to air does not cause oxidation and discoloration
- Motorcycle License Plate Holder- Our american flag motorcycle tag plate frame adopts stainless steel heavy duty metal, 1.3mm thickness, rust proof, can be a good protection of your motorcycle, bicycle license plate. It can be a good protection of different types of motorcycles, such as Yamaha, Honda, Harley Davidson, etc
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- Fits 7" x 4" license plates - 7.4" x 4.5" external size, for standard U.S. & Canadian license plate design , edge width 0.51", thin slim edge will not block the sticker on the tag plate.
- Easy to install - The motorcycle bike license plate bracket kit includes plate screws and nuts and screw caps for easy and stable license plate locking. The back of the license plate frame comes with a small hook slot to better protect the stability of the license plate. Black screw caps can keep the motorcycle plate clean and cool
- Guarantee- For our patriotic American flag motorcycle license plate mount kit, if you have any problems after purchasing, please contact us and we will actively solve them.
- Motorcycle License Plate Frame- Black stainless steel heavy duty metal material, surface black powder coating, 1.3mm thickness, rustproof, can be a good protection of your motorcycle, bicycle license plate. Stylish and sophisticated appearance, 1 pack for rear license plate of vehicle
- Fits 7" x 4" license plates - 7.4" x 4.5" external size, for standard U.S. & Canadian license plate design, The back of the license plate frame comes with a small hook slot to better protect the stability of the license plate
- Thin Edge Design - Simple elegant design to give your license plate the border edge it needs for that clean sophisticated look. Edge width 0.51", thin slim edge will not block the sticker on the tag plate. Complete the look for your motorcycle by installing this easy plate frame
- Easy to install - The motorcycle bike license plate holder kit includes stainless steel plate screws and nuts and screw caps for easy and stable license plate locking. Can use 2 or 4 screws, this is dependent on your license plate bracket where the license plate installs. Black screw caps with matte license plate, Complement each other to show elegant cool
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- 3D Raised Letter Patriotic Motorcycle License Plate Frame
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- Size: 7-1/2 inches length x 4-1/2 inches height
- Durable steel frame with superior chrome plated finish
- Designed for most United States motorcycle license plate
- Easy installation with your motorcycle's existing license plate fasteners
- Design Patent No D494,519S; Sold as each
- License Plate Frames
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Among them, building a chopper one seem to be easier because many pre-made blueprints and designs are available for you to select and modify. Thus, this way is more suitable for home builders and small motorbike shops.
On the other hand, since a sport bike frame requires a lighter weight to be fast, builders have to deal with the combination of light materials such as titanium, aluminum, and carbon fibers. It’s not easy to put them together.
In addition, a chopper frame is categorized into two minor types: rigid frames and softail frames. So, if you choose to go with this frame, it’s important to check this post to recognize what the differences between a rigid frame and a softail frame.
Step 2: Design
Before purchasing any part, you need to make a detailed picture of what your frame will look like. At that point, design is essential. All the components should be taken into account. For examples, what style of the tank, how high the seat should locate, what color for each part, etc.
If you know Photoshop or any CAD tool, use it. If you don’t, there are hundreds of pre-made models on the Internet. You pick the one you like and then customize it as the way you want. Also, there is an interesting and useful web-based app that I found on the Internet, allowing you to design your bike with zero designing skill. Check it at here.

Step 3: Prepare The Materials

Via https://www.cycleworld.com
Tubing: ERW (Electric Resistance Welded Steel) is most common selection for the tubing. Chromoly (Chromium & Molybdenum) is also a good option; it’s lighter, stronger, but it costs more.
- PVC material : Made of high quality PVC material. BPA Free and non-toxic. The material is lightweight flexible and crystal-clear. These clear tubing provides well resistance to chemicals, alkalis solvents and acids. Smooth inner surface is easy flow and cleaning.
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- Inexpensive: We deeply believe these clear tubing with 4 different dimensions 15 meters length in all, Packed by whole in one box is more inexpensive than local hardware store.
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- Our vinyl tubing has excellent transparency, lightness, and flexibility, with smooth interior and exterior, effectively preventing sediment accumulation, making it easy to flow and flush. And it is BPA free and non-toxic
- PVC material : Made of high quality PVC material. BPA Free and non-toxic. The material is lightweight flexible and crystal-clear. These clear tubing provides well resistance to chemicals, alkalis solvents and acids. Smooth inner surface is easy flow and cleaning.
- Three sizes: The Three clear tubings are all 1mm thickness and 3 meters length and the inner dimensions respectively are 6mm , 7mm, 8mm. Clear tubing Inner dimensions convert to inches are : 1/4" id, 9/32" id, 5/16" id
- Easy choose: We worry that you may buy wrong sizes, because the 6mm 7mm 8mm ID are too small. We choose 3 adjacent inner dimensions packed in a clean, sturdy box. There is always one correct dimensions right for you this time or next time.
- Fit most use: We hope these clear tubing are really nice collection set to have on hand for most repair project, such as air compressor hose,bleed your car brakes,DIY accessory, solder sucker hose,aquarium host air and water change , water changes for small fish tank , Hydroponics setup, submersible pump, automatic rabbit water, air conditioner drain,canister filter, fish hook protectors, glasses frame cover, pipe cover and so on.
- Cheap and cheerful : We deeply believe these clear tubing with 3 different dimensions 9 meters length in all, Come with 2 Hose Clamps, Packed by whole in one box is more inexpensive than local hardware store.
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- 1/4" ID x 3/8" OD pre-cut flexible silicone tubing. High quality, flexible silicone compound in compliance with FDA and 3A Sanitary Standards. USDA approved for meat and poultry plants.
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- Size - Plastic PVC tubing, 3/8 inch ID X 1/2 inch OD Length:100 Feet(=1200 Inch=30.5M)
- Widely Application - DERNORD PVC tubing is suitable for general industrial applications for the conveyance of liquids,and semi solids. Can be used with most barbed fittings and connectors.
- High Quality -This vinyl PVC hose is made of high quality material with smooth interior and exterior that prevents sediment accumulation and allows easy flow and cleaning.
- Durable Use - This plastic tubing is flexible, lightweight and crystal-clear. It provides excellent resistance to chemicals, solvents, alkalis.
- BPA Free and Non-Toxic - high quality and canbe used in potable water,beverage dispensing
- BASIC NECESSITY FOR AQUARISTS: As aquarists and fish-keeping hobbyists know, it’s always good to have extra airline tubing on hand. Our Standard 3/16” Airline Tubing offers a great solution for various aquarium airline needs, such as connecting an air pump to an air stone, an under-gravel filter, or an aquarium ornament.
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- MEASUREMENTS: Length = 8’ / Inner Diameter = 4 mm / Outer Diameter 5.8 mm.
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- PVC hose detail: 3/4" ID x 1" OD - 10 Ft(come with 2 hose clamps), Wall thickness: 3.2mm; Hardness: 73A (firm); Temperature Range : 23 °F to 149 °F (-5 °C to 65 °C); Working Pressure: 200PSI.
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Chassis and Lugs: DOM (Drawn Over Mandrel) is a standard choice. The process of producing DOM is quite similar to ERW; it takes a further step to take out the imperfections, making it stronger.
Step 4: Prepare The Necessary Tools
You will need a wide range of equipment to create a motorcycle frame. Here are some basics:
- Saw
- Angle Grinder
- Tubing Bender
- Measuring and Setting Tools: Plumb Bob Angle Finder Machinists Square
- Frame Jig
Step 5: Cut Components
According to your design, cut all the tubes and axles exactly in terms of dimension. You will deal with the steering yoke, seat post, backbone, bottom rails, and more. Note that you should leave a few inches to each part in case of fitting or even mistakes.
Step 6: Miter Junctions

A miter junction
To create perfect and accurate welds, it’s indispensable to fit of the tubes. The matching points are called miter junctions. In a motorcycle frame, there are many miter junctions like the seat tube and the backbone for examples.
The mouth fit can be beveled or flattened depending on the types of weld penetrations. As you match two or three tubes perfectly, you will be able to weld them perfectly.
Step 7: Tube Bending
It’s time to shape your tubes. You will need a tubing bender to complete this task. For a step-by-step bending process, check this video. My guide won’t show you how to bend, but it reveals you some pitfalls that you might face during the process.
- FAST & CLEAN CUTS: The hand saw has an exclusive tooth geometry for a fast clean cut
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- 3 SIDED RAZOR TEETH FOR EFFICIENT CUTTING: 10" blade is ideal for cutting 5" - 6" diameter, small to medium, branches
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- UP TO 6 TEETH PER INCH AND CURVED BLADE DESIGN FOR FASTER CUTTING: Cuts are smoother and quicker than a traditional saw.
- Durable SK-5 steel blade for efficient cutting during camping survival bushcraft landscaping and general yard work
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- An Idea Gift for Woodworker, Carpenter and Craft Man
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- [ Compact Design ]- Compact design, Save space in the go toolbox.
- This carpenter saw uses M2 tooth technology and Tri-Ground teeth for fast, efficient cuts
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- BLADE SECURITY: Solid metal frame of the hand saw is designed for tension up to 225 lbs.
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- COMFORT: Large, comfortable tension knob with a full-grip handle
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- AUTO OILER-SYSTEM: This mini chainsaw cordless is equipped with auto chain lubrication system. Just pour oil (general motor oil is fine) into the tank, then you can freely lubricate the chain by pressing, reduce wear and tear for smoother cutting, more cuts and less energy use. One oil fill can be used for a whole day, no more carrying around a heavy bottle of lubricating oil!
- LARGE CAPACITY BATTERY: Equipped with 2000mAh removable & rechargeable battery, the cordless mini chainsaw will finish all your cutting, even in the field! It's suitable for wood cutting, garden pruning, twig pruning, shrub pruning; widely used in gardens, farms, parks, forests, pastures, orchards, greenhouses. In addition, self-overload & temperature protection provide battery much longer life.
- SECURITY DESIGNS: 1. Security lock prevents accidental activation (The security lock & start button need to be pressed simultaneously for the chainsaw to start); 2. Safety baffles to prevent the wood from splashing; 3. Equip with an anti-slip texture handle, making you grip the mini chainsaw tightly; Safety comes, please feel free to use it!
The most serious problem is dimensional errors and angle errors due to incorrect measurements. Any of these issues could ruin your tubes, so be very careful.
Step 8: Tube Welding

Tube welding
During the welding process, components could budge askew. Thus, to keep the position and alignment, you should use some clamps, tacks or bars to fix everything. Watch this video for how to weld a motorcycle frame.
How To Build A Brat Style Bike
What is a Brat Style Bike?
A brat style bike is a café racer and was introduced by a Japanese custom builder called Brat Style. It has a very specific kind of seat (look like a banana). It was started originally by using a kind of skateboard-shaped seat before involving into more like a slab.

Via Pinterest.com
To summarize, a brat style bike typically has:
- Either a flat seat or a solo seat lowered via a mild frame modification
- High steer
- Sprung rear (no hardtail)
- Mini-apes or motocross handlebars (no clip-ons)
My Point of View about the Process of Building a Brat Style Bike
Since the process of building a brat style bike is quite similar to a café racer, this post will not show you a step-by-step guide to building your own brat style bike. You can visit here for a very detailed and complete guide for building a café racer.
What I want to show you in this post will be how to create a brat seat which the major difference between a brat style bike and a café racer. For other distinct parts like the mini-apes handlebar, the problem is purchasing them at the store, then assembling them in the quite similar way as a café racer.
- Ergonomic design: motorcycle seat cushion has a petal-shaped design, which provides enough space for your buttocks to distribute your weight, avoiding the discomfort or soreness of the buttocks caused by long ride
- Comfortable & breathable: the interior of the motorcycle seat pad is designed with a 3D honeycomb structure, which can circulate a lot of air and allow a cool experience throughout your entire ride; the groove in the middle increases the breathability, which can keep dry, breathable and not sticky. Bring you extra comfort for a cooler ride
- Shock absorption: motorcycle gel seat cushion is made from a highly-elastic gel material inside, which can provide enough cushioning and shock absorption, providing much-needed relief to your hips and tailbone, and greatly reducing the numbness of long-term riding
- Anti-slip design: there are anti-slip particles at the bottom of the motorcycle seat cover, and a double fixing strap with an anti-fall hook design, so that you no longer worry about the easy sliding of the seat cushion
- Universal application: motorcycle gel seat pad are generally suitable for most motorcycles on the market, and are breathable in all seasons; foldable and easy to carry, allowing you to fully enjoy the fun of riding
- Fitment: This is a universal seat. Modification to the motorcycle frame may be required to mount the seat.
- Dimensions: 20.9 inches * 9.8 inches * 4.7 inches (L 53 cm * W 24.8 cm * H 12 cm).
- Durable, waterproof and flexible PU leather of high quality.
- Vintage Cafe Racer Motorcycle Seat.
- Includes three removable mounting metal brackets and six pcs bolts & nuts.
- Made of high-quality yet soft and comfy leatherette, durable and waterproof. With thick cushion which can guarantees an easy and comfortable seating. Amazing stylish, but it costs much less than a custom made seat.
- Durable, waterproof, high quality and soft leatherette
- Features 6 M6 threaded mounting holes, includes 3 removable mounting metal brackets
- Package Contents: 1x Vintage Motorcycle Cafe Racer Seat ;3x Mounting Brackets
- Fitment:The cafe race seat complicatible with CB CG CL models, Yamaha SR XJ models, Suzuki GS GN GT models etc...,please check the side of the seat before you order.Thanks.
- ★1.【Motorcycle Bracket Seat】Spring Height: 3" (80mm), aftermarket 100% Brand new, perfect for customizing your bike with stylish design.
- ★2.【Material】Made of quality Synthetic Leather and neoprene foam, durable and soft, offers comfortable ridding. Mounting hardware kit (Springs &Bracket) included,springs with excellent shock absorption.
- ★3.【Fitment】It is Aftermarekt Solo Seat Kit Compatible for most of Harley Honda Yamaha Kawasaki Suzuki Sportster Bobber Chopper and Custom Application, Perfect for Harley Sportster XL883/120.
- ★4.【Easy Installation】Easy to install and great replacement,Not instruction, please check check sizes & fitments before purchase.
- ★5.【Package Included】1 PC solo seat+1 PC swivel bracket+2 PCS solo seat springs.
- Suitable for: CB SR Yamaha XJ Suzuki GS motorcycles and other motorcylce with flat bike frame; (Universal fit, modification to the motorcycle frame may be required to mount the seat;)
- Durable, waterproof and flexible PU leather of high quality
- Includes three removable mounting metal brackets and six pcs bolts & nuts
- Suitable for: Honda CB SR Yamaha XJ Suzuki GS motorcycles and other motorcylce with flat bike frame; (Universal fit, modification to the motorcycle frame may be required to mount the seat;)
- ❶【Material】: Our Motorcycle Seat Cushion are made of Synthetic Leather + Neoprene Foam + Heavy Duty Steel. It looks like better and more retro, let your motorcycle add a different sense of fashion and retain the rider comfort.
- ❷【About Motorcycle Seat Cushion Features】: (1) It is covered with high class quality leatherette, waterproof, durable for long term use; (2) Filled with very soft foam, comfortable for your seat, so the seat is suitable for all weather condition; (3) The alligator surface design can perfect to decorate your Motorcycle.
- ❸【About Fitments】: Can fit for most of Motorcycle for Har*ley/Honda/Yamaha/Kawasaki/Suzuki/Sport-ster/Bobber/Chopper.
- ❹【Installation】: Easy to install, a perfect replacement for the original one. Coming with heavy duty mounting bracket and springs, mounting base included.(1* Seat pad + 2 * Springs + 1 * Mounting Bracket.)
- ❺【NATGIC Warranty & Service】: NATGIC Products are strictly tested for sale!! We offer "Two Years" warranty on items damaged during delivery or have a confirmed manufacturer defect. Please make sure the product's model before purchase. If you have any problems about our product, please feel free to contact us.
- CONDITION: Aftermarket 100% Brand new
- FITMENTS: Fits for Harley Sportster Bobber Chopper and Custom Application, Perfect for Harley Sportster XL883 XL1200.
- Sleek Design: The black leather finish and stylish stitching give your motorbike a sleek and customized look, adding a touch of elegance to your ride.
- Easy Installation: The included spring bracket kit ensures a hassle-free installation process, allowing you to quickly and securely attach the seat to your motorbike.
- PACKAGE INCLUDED: Seat pad + Seat base + Bracket (Easy to install, Not instruction with it).
- [ Material ] Make by high quality leatherette, sponge, abs platics and steel, soft touching, tight and neat stitches, fill in average and enough sponge, strong bottom plat
- [ Vintage Brat Style ] Cafe racer brat motorcycle seat, avid retro motorcycle lovers! This is the good choice for you!
- [ Note ] This is not specific for any motorcycles, need to do some modification to the frame to fit this seat
- [ Size ] 24.4 x 9.84 x 3.54in / 62 x 25 x 9 cm, please measure on your frame firstly
- [ Packing ] Retro flat seat*1/Bracket*2/Bolts*4/Nuts*4
- 【Fitment】The Motorcycle Cushion fit for Sportster 883 1200 72 48 1983-2003
- 【Color】Black
- 【Material】Faux Leather, Foam, Plastic
- 【Application】The Cushion Pad improves rider comfort and positioning
- 【Package】1 x Front Driver Rider Solo Seat
- Fitment : Most of the Harley Motorcycle / Cruiser / Chopper / Custom
- Package Included : 1 X Black Pillion Rectangular Pad Seat
- Seat size : 260 x 160 x 45mm/ 10.2" x 6.3" x 1.8"(L*W*H)
- Material : Synthetic leather
- Color : Black
How to Build a Brat Seat

Via https://thebikeshed.cc
Step 1: Tools and Materials
Step 2: Building the Base of the Seat
Step 3: Cut the Foam
Step 4: Attach the Foam onto the Seat Base
Step 5: Create the Seat Cushion
Step 6: Stitch the Cushion
How To Build A Sidecar for A Motorcycle

Via Brooks Motor Works
Step 1: Design
Step 2: Material
Step 3: Cut Components
Step 4: Miter Junctions
Step 5: Tube Bending
Step 6: Tube Welding
Step 7: Attach the Sidecar to the Motorcycle
Step 8: Build the Bodywork
Step 9: Finish your Sidecar
Conclusion
I hope this guide able to thoroughly solve your questions: how to build a motorcycle frame from scratch, how to build a brat style bike, and how to build a sidecar for a motorcycle. If you have any question or suggestion, please leave it in the comment section below. Thank you so much for reading!