Building a flat track bike involves transforming a regular motorcycle into a competitive machine designed for dirt oval racing, and at usabikers.net, we’re here to help you navigate the process with expert advice and community support. This guide will help you understand the key modifications, safety features, and performance enhancements needed to build your own flat track bike, along with information from the American Motorcyclist Association (AMA). By optimizing your bike with the right components and safety measures, you can enhance its performance and ensure a thrilling and secure flat track racing experience; plus, you can find valuable resources and connect with fellow enthusiasts at usabikers.net.
1. What Are The Essential Rim Size Considerations For A Flat Track Bike Build?
Rim size is critical for flat track bike builds, impacting tire fitment and overall performance. Ideally, the rear rim should be no smaller than 2.15 inches to accommodate a 130-size flat track tire properly; plus, a 140-size tire can also fit on a 2.15-inch rim.
1.1 Why Is Rim Size Important For Flat Track Bikes?
Rim size is critical because it directly affects the tire’s profile and contact patch, which influence traction and handling. According to experts at the American Motorcyclist Association (AMA), proper tire fitment is crucial for optimal performance on the track; plus, a rim that’s too narrow can pinch the tire, reducing its contact area and making the bike less stable.
1.2 What Is The Recommended Rear Rim Size For Flat Track Tires?
For the rear rim, a minimum width of 2.15 inches is recommended, allowing a 130-size flat track tire to fit well; however, a 140-size tire can also be fitted on a 2.15-inch rim. Using a smaller rim might complicate fitting the flat track tire, although not impossible, a 2.15 width is suggested for best fitment and performance.
1.3 What Are The Options For Wider Rear Rims?
If desired, you can opt for a wider rim up to 3.00 inches, but ensure it fits within your swingarm before purchasing. Checking the clearance ensures that the wider rim doesn’t rub against the swingarm during races.
1.4 Should I Modify The Front Rim For Flat Track Racing?
The front rim can remain the stock 21-inch size and still be competitive, but if you’re willing to invest more, consider lacing a 19-inch rim to your stock hub; plus, this modification often requires custom spokes and professional wheel work. Upgrading to a 19-inch front wheel is often seen as a sign of a more serious, professional setup.
1.5 Where Can I Find More Information On Wheel and Rim Upgrades?
For further details on wheel and rim upgrades, visit usabikers.net; plus, you’ll find detailed guides, expert opinions, and community discussions to help you make the best choices for your flat track bike build.
2. What Role Does A Tether Switch Play In Flat Track Bike Safety?
A tether switch is a critical safety component that cuts off the engine in the event of a crash, preventing the bike from running uncontrolled on the track. This switch is typically connected to the rider’s wrist with a cord.
2.1 How Does A Tether Switch Work?
A tether switch is designed to immediately stop the engine if the rider becomes separated from the bike; plus, this is achieved via a cord that attaches the switch to the rider’s wrist. If the rider falls, the cord pulls the switch, cutting the engine and preventing the bike from continuing without a rider.
2.2 Why Is A Tether Switch Essential For Flat Track Racing?
According to safety guidelines from the Motorcycle Safety Foundation (MSF), tether switches significantly reduce the risk of runaway bikes causing further accidents on the track; plus, they prevent the bike from careening into walls or crowds, enhancing overall safety.
2.3 What Are The Two Main Types Of Tether Switches?
There are two main types of tether switches: Normally Closed (NC) and Normally Open (NO). NC switches cut the electrical circuit, while NO switches short the circuit.
2.4 How Do I Choose The Right Tether Switch For My Bike?
Select the correct tether switch based on whether your bike’s electrical system cuts or shorts the circuit to kill the engine; plus, using the wrong type can cause significant operational issues. Newer EFI bikes typically use a shorting mechanism, requiring an NO switch.
2.5 What Happens If I Install The Wrong Type Of Tether Switch?
Installing the wrong type of tether switch can lead to considerable frustration; plus, if you use an NC switch on a system designed for NO, the bike might not start or run correctly, and vice versa.
2.6 Where Can I Get Professional Help With Electrical Systems?
If you’re unfamiliar with your bike’s electrical system, it’s best to consult with a knowledgeable friend or a professional mechanic; plus, incorrect wiring can damage your bike or compromise the switch’s effectiveness. You can also find expert advice and community support on electrical systems at usabikers.net.
3. How Do I Choose The Right Flat Track Tires For My Bike?
Selecting the right tires is crucial for maximizing performance on a flat track bike, so the correct tires provide the necessary grip and stability for dirt oval racing. Factors like tire size, compound, and tread pattern significantly impact handling and speed.
3.1 What Tire Size Should I Use For Flat Track Racing?
For the rear, a 130-size tire is commonly used on a 2.15-inch rim, although a 140-size tire can also fit; plus, the front can either remain a stock 21-inch or be upgraded to a 19-inch rim. The choice depends on budget and desired level of performance.
3.2 What Tire Compound Is Best For Flat Track Racing?
Tire compound affects grip and wear, softer compounds offer more grip but wear faster, while harder compounds last longer but may offer less traction. According to tire specialists at Dunlop, medium compounds often strike a good balance for flat track racing, providing decent grip and reasonable durability.
3.3 How Does Tread Pattern Affect Flat Track Tire Performance?
Tread pattern is essential for dispersing dirt and maintaining contact with the track surface, so flat track tires typically have minimal tread to maximize the contact patch. The design ensures the tire grips effectively without losing traction.
3.4 Can I Use Regular Motorcycle Tires For Flat Track Racing?
Using regular motorcycle tires for flat track racing is not recommended; plus, flat track tires are specifically designed for the demands of dirt oval racing, providing the necessary grip and stability. Regular tires won’t perform as well and can be dangerous.
3.5 How Often Should I Replace My Flat Track Tires?
Tire replacement frequency depends on usage and wear; however, regular inspection is essential, and tires should be replaced when they show signs of wear or reduced grip. Expert racers often change tires before each race to ensure optimal performance.
3.6 Where Can I Find Reviews Of Flat Track Tires?
For reviews and comparisons of different flat track tires, visit usabikers.net; plus, you’ll find community discussions and expert opinions to help you choose the best tires for your racing needs.
4. What Modifications Improve The Handling Of A Flat Track Bike?
Improving the handling of a flat track bike involves several key modifications, including adjusting suspension, optimizing frame geometry, and reducing weight. These changes enhance maneuverability and control on the dirt track.
4.1 How Does Suspension Affect Handling On A Flat Track Bike?
Suspension plays a critical role in absorbing bumps and maintaining tire contact with the track, so upgrading to adjustable suspension components allows you to fine-tune the bike’s response to different track conditions. According to suspension experts at Race Tech, properly tuned suspension can significantly improve cornering and stability.
4.2 What Frame Modifications Are Common In Flat Track Racing?
Frame modifications can include reinforcing weak points, adjusting the steering head angle, and lowering the overall ride height; plus, these adjustments improve stability and cornering ability. Frame modifications are typically done by experienced professionals to ensure safety and performance.
4.3 How Important Is Weight Reduction For Flat Track Bikes?
Reducing weight improves acceleration, braking, and overall handling, so common methods include using lightweight wheels, removing unnecessary components, and opting for lighter materials. Every pound saved can make a noticeable difference on the track.
4.4 Can I Modify The Swingarm To Improve Handling?
Modifying the swingarm can improve traction and stability; plus, some racers opt for longer swingarms to increase stability on straights. Make sure any swingarm modifications comply with racing regulations.
4.5 What Role Do Handlebars Play In Flat Track Bike Handling?
Handlebars affect rider comfort and control, so choosing the right bend and width can improve leverage and maneuverability. Many riders prefer wider handlebars for better control in the corners.
4.6 Where Can I Find More Advice On Handling Modifications?
For more in-depth advice on handling modifications, check out usabikers.net; plus, you’ll find articles, forums, and expert tips to help you optimize your flat track bike’s handling.
5. What Engine Modifications Are Recommended For A Flat Track Bike?
Engine modifications can significantly boost the performance of a flat track bike, so common upgrades include enhancing intake and exhaust systems, remapping the ECU, and upgrading internal components. These modifications increase power and torque, improving acceleration and top speed.
5.1 How Does Upgrading The Intake System Improve Engine Performance?
Upgrading the intake system allows the engine to breathe more efficiently, so high-flow air filters and modified intake manifolds increase the amount of air entering the engine, improving combustion and power output. K&N Engineering reports that their high-flow air filters can increase horsepower by up to 5%.
5.2 What Are The Benefits Of Upgrading The Exhaust System?
An upgraded exhaust system reduces backpressure, allowing the engine to expel exhaust gases more efficiently; plus, this leads to increased horsepower and torque, particularly in the mid-range. Brands like Yoshimura offer exhaust systems specifically designed for performance gains.
5.3 How Does ECU Remapping Enhance Engine Performance?
ECU remapping optimizes the engine’s fuel and ignition settings, so this can result in improved throttle response, increased horsepower, and better fuel efficiency. Dynojet offers ECU tuning solutions that allow for custom mapping to suit specific engine modifications.
5.4 What Internal Engine Upgrades Are Common For Flat Track Bikes?
Internal engine upgrades can include high-compression pistons, performance camshafts, and reinforced connecting rods; plus, these upgrades increase power and reliability, allowing the engine to withstand the stresses of racing. Brands like Wiseco offer a range of performance engine components.
5.5 How Important Is Cooling For Modified Flat Track Bike Engines?
Proper cooling is essential for modified engines, preventing overheating and ensuring consistent performance, so upgraded radiators, oil coolers, and high-performance coolant can help maintain optimal engine temperatures. Mishimoto offers cooling solutions designed to improve thermal efficiency.
5.6 Where Can I Find A Reputable Engine Tuner?
Finding a reputable engine tuner is crucial for getting the most out of your engine modifications; plus, experienced tuners can provide custom solutions tailored to your specific bike and racing needs. Ask for recommendations on usabikers.net to find trusted tuners in your area.
6. What Safety Gear Is Necessary For Flat Track Racing?
Safety gear is paramount in flat track racing, protecting riders from potential injuries, so essential gear includes a helmet, riding suit, gloves, and boots. Investing in high-quality safety equipment is crucial for minimizing risks on the track.
6.1 What Are The Helmet Requirements For Flat Track Racing?
Helmets must meet specific safety standards, such as DOT, ECE, or Snell certifications, so full-face helmets are typically required, offering maximum protection for the head and face. Shoei and Arai are popular brands known for their high-quality helmets.
6.2 What Features Should I Look For In A Riding Suit?
Riding suits should offer abrasion resistance, impact protection, and a comfortable fit, so leather or high-quality synthetic materials are common choices, providing protection in the event of a fall. Alpinestars and Dainese offer riding suits with advanced safety features.
6.3 Why Are Gloves Important In Flat Track Racing?
Gloves protect the hands from abrasions and impacts, so they should fit well and provide good grip; plus, reinforced palms and knuckle protection are essential features. Brands like Mechanix Wear offer gloves designed for durability and protection.
6.4 What Type Of Boots Are Best For Flat Track Racing?
Boots should provide ankle and foot support, with reinforced areas to protect against impacts; plus, sturdy soles offer good grip and prevent slipping. Sidi and Gaerne are well-regarded brands for motorcycle boots.
6.5 Are There Any Other Essential Pieces Of Safety Gear?
Other essential items include a neck brace to protect against neck injuries and body armor to shield the chest and back, so these additional layers of protection can significantly reduce the risk of serious injuries. Leatt and EVS Sports offer a range of protective gear.
6.6 Where Can I Find Safety Gear Recommendations From Experienced Racers?
For safety gear recommendations and reviews, check out usabikers.net; plus, you’ll find valuable insights from experienced racers to help you make informed decisions about your safety equipment.
7. How Can I Optimize My Flat Track Bike For Different Track Conditions?
Optimizing a flat track bike for various track conditions involves adjusting suspension, tire pressure, and gearing, so these adjustments ensure the bike performs optimally on different surfaces and layouts. Understanding how to adapt your setup to the track is crucial for competitive racing.
7.1 How Does Suspension Adjustment Affect Performance On Different Tracks?
Suspension settings should be adjusted based on track conditions, so softer settings can improve grip on slick tracks, while stiffer settings can enhance stability on high-speed tracks. Experimenting with compression and rebound settings is essential for finding the optimal setup.
7.2 What Role Does Tire Pressure Play In Flat Track Racing?
Tire pressure affects grip and handling, so lower pressures increase the contact patch on slick tracks, while higher pressures reduce rolling resistance on hard-packed surfaces. Monitoring tire pressure and adjusting accordingly is crucial for maintaining optimal performance.
7.3 How Does Gearing Affect Acceleration And Top Speed?
Gearing affects acceleration and top speed, so shorter gearing provides quicker acceleration on tight tracks, while taller gearing increases top speed on longer straights. Experimenting with different sprocket sizes can help you find the best balance for each track.
7.4 Can I Use Data Logging To Optimize My Bike’s Performance?
Data logging systems record various parameters, such as suspension travel, engine RPM, and throttle position; plus, analyzing this data can provide valuable insights into your bike’s performance and help you identify areas for improvement. AIM and Racepak offer data logging solutions for motorcycles.
7.5 How Important Is Trackside Support For Optimizing My Bike?
Having trackside support from experienced mechanics and tuners can be invaluable; plus, they can help you diagnose issues, make adjustments, and optimize your bike’s performance based on real-time feedback. Many racing teams offer trackside support services.
7.6 Where Can I Learn More About Track Optimization Techniques?
For more information on track optimization techniques, visit usabikers.net; plus, you’ll find articles, forums, and expert tips to help you fine-tune your flat track bike for any track condition.
8. What Are The Common Mistakes To Avoid When Building A Flat Track Bike?
Building a flat track bike can be a complex process, so avoiding common mistakes is crucial for ensuring a successful and safe build. These mistakes include neglecting safety, overlooking proper tire fitment, and failing to tune the suspension correctly.
8.1 Why Is Neglecting Safety A Major Mistake?
Neglecting safety by skimping on safety gear or ignoring essential modifications like tether switches can have serious consequences; plus, always prioritize safety to minimize the risk of injury.
8.2 What Happens If I Overlook Proper Tire Fitment?
Overlooking proper tire fitment can lead to poor handling and reduced traction, so ensure that your tires are correctly sized and mounted on the appropriate rims for optimal performance.
8.3 Why Is Suspension Tuning Essential For A Flat Track Bike?
Failing to tune the suspension correctly can result in a bike that handles poorly and is difficult to control; plus, invest time and effort in dialing in your suspension settings to suit your riding style and track conditions.
8.4 Can I Skip Engine Maintenance On A Flat Track Bike?
Skipping engine maintenance can lead to breakdowns and reduced performance; plus, regular maintenance, including oil changes and valve adjustments, is essential for keeping your engine running smoothly.
8.5 Why Is It Important To Follow Racing Regulations?
Ignoring racing regulations can lead to disqualification and potential safety issues; plus, familiarize yourself with the rules and ensure your bike complies with all requirements.
8.6 Where Can I Find Reliable Advice On Building A Flat Track Bike?
For reliable advice on building a flat track bike, turn to usabikers.net; plus, you’ll find expert guides, community discussions, and valuable resources to help you avoid common mistakes and build a competitive machine.
9. How Do I Maintain My Flat Track Bike For Longevity And Performance?
Maintaining a flat track bike involves regular checks and servicing, so consistent maintenance ensures the bike remains reliable and performs optimally. Key maintenance tasks include oil changes, filter replacements, and thorough inspections.
9.1 How Often Should I Change The Oil On My Flat Track Bike?
Oil should be changed frequently, typically after every few races or practice sessions, so using high-quality oil ensures optimal engine lubrication and protection. Brands like Motul offer oils specifically designed for racing applications.
9.2 Why Are Filter Replacements Important?
Regularly replacing air and oil filters prevents contaminants from entering the engine, so clean filters improve engine performance and longevity. K&N and other brands offer high-performance filters for flat track bikes.
9.3 What Should I Inspect Regularly On My Flat Track Bike?
Regular inspections should include checking tires for wear, inspecting brake pads and rotors, and examining suspension components for leaks or damage; plus, catching potential issues early can prevent more significant problems down the road.
9.4 How Do I Maintain The Chain And Sprockets On My Flat Track Bike?
Chains and sprockets should be cleaned, lubricated, and inspected regularly, so proper maintenance ensures smooth power delivery and prevents premature wear. Brands like DID offer high-quality chains and sprockets for racing.
9.5 What Should I Do During Off-Season Maintenance?
Off-season maintenance should include a thorough inspection, fluid changes, and any necessary repairs; plus, storing the bike properly prevents corrosion and other issues during periods of inactivity.
9.6 Where Can I Find Maintenance Schedules And Checklists?
For detailed maintenance schedules and checklists, visit usabikers.net; plus, you’ll find resources to help you keep your flat track bike in top condition, ensuring longevity and optimal performance.
10. How Can I Find A Flat Track Racing Community And Events Near Me?
Finding a local flat track racing community and events is essential for connecting with other enthusiasts and honing your skills, so joining a local racing club or checking event listings online can help you get involved in the sport.
10.1 How Do I Find Local Racing Clubs?
Local racing clubs often organize races and events in your area, so searching online or asking for recommendations at local motorcycle shops can help you find a club that suits your needs.
10.2 Where Can I Find Listings Of Flat Track Racing Events?
Event listings can be found on websites like the American Motorcyclist Association (AMA) and local racing club websites; plus, these listings provide information on race dates, locations, and entry requirements.
10.3 How Can I Connect With Other Flat Track Racers Online?
Online forums and social media groups are great places to connect with other flat track racers, so you can share tips, ask questions, and find out about local events.
10.4 Are There Any National Flat Track Racing Organizations?
National organizations like the AMA oversee flat track racing events across the country, providing a structured racing environment and opportunities to compete at a higher level.
10.5 How Can I Improve My Racing Skills?
Attending racing schools and practice sessions can help you improve your skills and learn from experienced racers; plus, these opportunities provide valuable instruction and track time.
10.6 Where Can I Find A Supportive Community Of Flat Track Racers?
For a supportive community of flat track racers, visit usabikers.net; plus, you’ll find forums, articles, and resources to help you connect with other enthusiasts, share your experiences, and grow as a racer. Plus, connect with us at 801 Sturgis Main St, Sturgis, SD 57785, United States or call +1 (605) 347-2000.
FAQ: Building a Flat Track Bike
Q1: What is the most important modification for a flat track bike?
The most important modification is installing a tether switch, which cuts off the engine in a crash to prevent the bike from running uncontrolled.
Q2: What size rear rim is recommended for flat track tires?
A rear rim size of 2.15 inches is recommended to properly fit a 130-size flat track tire, and a 140-size tire can also fit.
Q3: Can I use regular motorcycle tires for flat track racing?
No, regular motorcycle tires are not suitable, so flat track tires are specifically designed for the demands of dirt oval racing.
Q4: How often should I change the oil on my flat track bike?
Oil should be changed frequently, typically after every few races or practice sessions, to ensure optimal engine lubrication.
Q5: What safety gear is essential for flat track racing?
Essential safety gear includes a helmet, riding suit, gloves, and boots, all designed to protect against potential injuries.
Q6: How does ECU remapping improve engine performance?
ECU remapping optimizes fuel and ignition settings, resulting in improved throttle response and increased horsepower.
Q7: What should I look for in a riding suit for flat track racing?
A riding suit should offer abrasion resistance, impact protection, and a comfortable fit, typically made from leather or high-quality synthetic materials.
Q8: How does suspension tuning affect performance on different tracks?
Suspension settings should be adjusted based on track conditions, with softer settings for slick tracks and stiffer settings for high-speed tracks.
Q9: Why is weight reduction important for flat track bikes?
Reducing weight improves acceleration, braking, and overall handling, making the bike more responsive and easier to control.
Q10: Where can I find a community of flat track racing enthusiasts?
You can find a supportive community of flat track racers at usabikers.net, where you’ll discover forums, articles, and resources to connect with other enthusiasts.
Building a flat track bike is an exciting journey that combines mechanical skill, strategic modifications, and a passion for racing; plus, by following this comprehensive guide, you can create a machine that’s both competitive and safe. For more expert advice, community support, and the latest resources, be sure to visit usabikers.net, your ultimate destination for all things related to motorcycles and the biker culture.
