Specification
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Progressive Coil Over Springs
Landrum Progressive Coil Over Springs provide the reliable and consistent high performance you need to win.
What Are Progressive Coil Over Springs?
Progressive springs provide a varying spring rate throughout their range of travel. The initial spring rate is low but progressively increases as the spring is compressed. The springs are commonly used in circle track racing applications to help control body roll when cornering.
How Do Progressive Rate Coil Over Springs Work?
Progressive rate coil over springs are produced with varying coil spacing. At one end of the spring the coils are narrow spaced and as the coils progress to the other end of the spring the spacing becomes wider.
When the spring is minimally compressed all coils of the spring are active and a lower spring rate is in effect. As the spring is further compressed, such as when a car takes a set as it enters a corner, the narrow-spaced coils collapse on top of each other until they touch, which is also known as “going solid”. When this happens the number of active coils of the spring is reduced, which results in a higher spring rate.
What Type of Steel is Used for Progressive Coil Over Springs?
We manufacture our progressive coil over springs using the highest quality US made High Tensile Chrome Silicon Alloy Steel for strength, reliability, and to maintain their original high-performance characteristics after repeated use.
Landrum Race Proven Performance
Since 1966, Landrum Performance Springs have helped put racers in victory lane. Racers and crew chiefs trust Landrum for the best spring performance.
Progressive Coil Over Spring Sizes
- 2.5” ID
- 10”, 12”, 14” and 16” Lengths
- Rates:
- 175-350 lb./in.
- 140-375 lb./in.
- 200-400 lb./in.
- 250-400 lb./in.
Learn more about how Landrum Springs are designed and manufactured here.
Related products
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Landrum Performance Conical Coil Over Springs taper from a 5.0” OD to a 2.5” ID to prevent bowing that can occur with long and slender coil over springs. Using the proper hardware, the high travel, low-rate conical spring can be used as coil-over springs or conventional mount springs.
Durable and consistent Landrum Performance conical coil springs are designed for circle track, dirt late model, and pavement late model cars.
Advantages of Conical Coil Over Springs
- The conical spring shape provides greater lateral stability to avoid lateral deflection.
- Conical coil springs allow more precise control of spring deflection.
- When compressed the tapered spring coils fit into the other (coil telescoping). This decreases solid height at full compression to provide a higher range of travel.
- The linear spring rate from free length to solid height provides a more usable range of deflection.
- Lighter weight than non-tapered suspension springs.
Landrum Quality
- Produced with the highest quality US made High Tensile Chrome Silicon wire.
- Manufactured to the tightest tolerances in the industry and guaranteed to hold their tolerance to 2%. We prove it with a dyno sheet included with each spring.
- Durable
Conical Coil Over Spring Sizes
- Free Length: 18”
- 5.0” OD and 2.5” ID
- Available Rates: 50, 75, and 100 lbs. per inch
Additional Landrum Performance Springs technical information can be found here.
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Landrum Coil Over Barrel Springs avoid the bending and bowing issues associated with long length coil over springs.
High travel coil over springs with lengths more than 4 times their width have a tendency to bow when compressed. The greater the length of the spring, the more it can bow. Causing spring rate inconsistency, and possibly cause damage to shocks if they make contact. Our Coil Over Barrel Springs use a barrel shape design to prevent bowing when they’re compressed. Thereby maintaining spring performance.
How Do Coil Over Barrel Springs Prevent Bowing?
- The conical shape of our Coil Over Barrel Springs allows more even stress distribution across the length of the spring, which provides lateral stability. Making the springs less prone to bending or bowing sideways during compression.
What Are the Advantages of Coil Over Barrel Springs?
- Provide more consistent and controlled weight transfer during cornering and acceleration. Keeping tires in the best contact with the surface.
- Increased spring travel before coil bind.
- Lateral stability keeps the spring properly seated.
- Avoiding bending or bowing keeps the spring from rubbing against the shock body, which could damage the threads of the shock adjusting perch.
- The barrel shape allows for efficient use of materials.
- By tapering the spring, it can be designed to be both lightweight and structurally sound.
The Best Materials and Engineering
- Manufactured with only the best grade of high tensile chrome silicon alloy steel for strength, durability, and lightness.
- Designed using the latest spring design software and state-of-the-art engineering technology.
Intensive Quality Control Processes
- Tensile and compressive stiffness of the wire is checked before the coiling process.
- Springs undergo an intensive heat and press process.
- Each spring is individually tested for quality and consistent performance.
Dyno Sheet
- Every Landrum Performance Coil spring comes with a dyno sheet that shows the dynamic rate and force output of the spring in 0.200” increments. This allows you to know exactly what the spring rate is and means when you change a spring, you know exactly what change is being made. No other manufacturer does this.
Learn more about Landrum’s tight spring tolerances here
Coil Over Barrel Spring Sizes
- 5” ID x 11” length available with rates of 125 lb./in to 600 lb./in
- 5” ID x 12” length available with rates of 100 lb./in to 350 lb./in
- 5” ID x 13” length available with rates of 125 lb./in to 350 lb./in
- 5” ID x 14” length available with rates of 125 lb./in to 275 lb./in
- 5” ID x 15” length available with rates of 80 lb./in to 100 lb./in
- 5” ID x 16” length available with rates of 105 lb./in to 135 lb./in
More Landrum technical information available here.
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Coilover Springs
Landrum High Travel, Lightweight, Precise and Dependable Coilover Springs
Race proven Landrum coilover springs are specially engineered for high travel applications including circle track, drag racing, street and offroad. Manufactured in the United States with the highest-quality Chrome Silicon steel wire, our coilovers are engineered for maximum high travel performance, long service life and to be lightweight. Every spring is preset to solid height during manufacturing, allowing them to be compressed to solid while providing consistent high performance throughout their range of travel. Using incredibly precise manufacturing tolerances, we ensure all our springs perform exactly as they were originally engineered. Each Landrum coilover spring comes with a dyno sheet showing its dependable performance.
Available Coilover Spring Sizes
- 4-inch to 22-inch lengths
- 1.9-inch to 3.75-inch ID
- 50 lb./ft to 850 lb./ft spring rates
Circle Track Coilover Springs
Landrum circle track coil over springs have helped put many drivers in the winner’s circle. Including racers of oval dirt track, dirt modified, dirt late model and oval pavement cars. Landrum springs are designed to exceed the high-performance demands of racing.
Offroad Coilover Springs
High performance offroad suspensions need durable high travel springs that provide consistent performance throughout their range of travel. Landrum offroad coil over springs provide just that. Our wide variety of spring sizes and rates allow you to find exactly what you need for your offroad suspension set up.
Street Performance Coilover Springs
Coilover suspension conversions for street performance cars continue to grow in popularity. Landrum makes it easy to find street performance coil over springs in the right length, ID, and rate to help your car handle and ride the way you want.
Landrum Hot Rod Coilover Springs
With hot rods, stance is what it’s all about. Landrum hot rod coil over springs are offered in sizes so you can get the stance that makes your ride look great. Our lightweight, precise, and dependable springs give you what you need.
Learn more about Landrum’s tight spring tolerances here
If you need Take Up Springs, check these out
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Best Performing Quarter Midget Springs
Landrum Quarter Midget Springs have the highest travel and tightest manufacturing tolerance in the industry. US Made High Tensile Chrome Silicon Wire is used for a high strength and ultra-lightweight spring. Offered in 4” and 5” free length sizes and many spring rates to allow tuning for all track conditions. Landrum is proud to bring racers the best performing Quarter Midget Springs.
Race Proven Performance
Race proven Landrum Quarter Midget Springs reduce unsprung weight and go through a rigorous press and heat treatment process to ensure they are the most accurate and reliable 1/4 Midget Springs on the market. Their high travel spring design provides superior and consistent performance when the going gets bumpy.
Quarter Midget Spring Sizes
- Landrum Quarter Midget Spring sizes feature 4-inch and 5-inch free height with a 1.625” ID.
- Available spring rates of 75lb/ft up to 125lb/ft help dial in quarter midget suspension setup for the best track conditions to the worst.
- Superior engineering and manufacturing techniques ensure the tightest spring tolerance
Made in the USA
Since 1966, Landrum Performance Springs has been providing racers with race winning high performance springs for circle track racing. Using only the best US sourced High Tensile Chrome Silicon Spring Wire, Landrum Quarter Midget Springs are expertly produced at our Indiana location.
Check out this video to learn more.
Technical information about Landrum Spring materials and manufacturing can be found here