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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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
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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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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 Dirt Late Model Coil Over Springs give you the winning edge.
What are Dirt Late Model Coil Over Springs?
Landrum Dirt Late Model Coil Over Springs are engineered for maximum travel, clearance, coil spacing and lightness to meet and exceed the extreme demands of Dirt Late Model racing. Our springs provide the performance, durability and consistency needed to win.
Coil over springs that don’t take a set
- Preset to solid height during manufacture, allowing them to be compressed to solid during use while providing consistent performance throughout their range of travel.
- Dirt Late Model Coil Over Springs are built to operate at maximum stress levels without losing free height. So, they’re able to go to coil bind and not take a set.
Proven dirt late model coil over springs performance
Landrum springs have the closest tolerances in the industry and are tested to be within 2% of specification. We prove it with a dyno sheet provided with each spring showing the performance of the spring as it is compressed. No other racing spring manufacturer does this.
Top quality 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.
Dirt late model coil over spring sizes
- Dirt Late Model Coil Over Springs have 2.5” ID and are available in many different length and rate combinations.
Conical and progressive coil over springs for dirt late model cars
Landrum offers other springs for dirt late model cars: