Dinan Performance Spring Set – 2013–2018 BMW 335i / 340i xDrive (F30) | 30% Increased Spring Stiffness | Lowered Ride Height | CNC-Wound Chrome Silicon | Factory Electronic Shock Compatible

The Dinan Performance Spring Set for the 2013–2018 BMW 335i and 340i xDrive (F30) is a complete set of CNC-wound chrome silicon performance lowering springs engineered to reduce body roll, improve suspension geometry, lower the vehicle's ride height, and deliver a more controlled, confidence-inspiring driving experience — while maintaining compatibility with the factory electronic shock absorbers. Dinan's suspension systems are engineered to transform the stance and handling of the vehicle without sacrificing ride quality — achieved by pairing the spring set with Dinan's corresponding Ride Quality and Handling Kit (sold separately, strongly recommended) to maintain correct suspension travel and ride quality.

IMPORTANT: Dinan Performance Spring Sets should be purchased and installed with the corresponding Dinan Ride Quality and Handling Kit to achieve the advertised ride height, handling performance, and ride quality. Installing the spring set without the corresponding handling kit will result in poor ride quality and improper handling characteristics. Dinan's warranty on handling and ride quality claims applies only when both components are installed together.

Ride Height Reduction:

• BMW 335i xDrive (F30): Lowered 3/4" in the front and 3/4" in the rear
• BMW 340i xDrive (F30): Lowered 1" in the front and 1-1/8" in the rear

Key Features:

• 30% increase in spring stiffness — 30% stiffer than the factory springs — reduces rear suspension compression under acceleration and front suspension dive under braking for a more controlled, planted feel
• Substantial reduction in body roll — the increased spring rate significantly reduces body roll in cornering — making the steering more responsive to driver input at speeds from 20 mph to the vehicle's top speed
• Improved suspension geometry — the lowered ride height improves the F30's suspension geometry for improved mechanical grip and handling precision
• Compatible with factory electronic shocks — compatible with both conventional and factory electronic (EDC) shock absorbers — no shock replacement required for installation
• CNC-wound chrome silicon wire — springs are CNC wound from high-tensile chrome silicon wire for precise spring rate consistency and long-term durability
• Shot-peened for stress relief — shot-peening process relieves surface stress in the spring wire — engineered to last the life of the car without spring sag
• Preset to prevent spring sag — springs are preset during manufacturing to prevent sag over time — maintaining the correct ride height and spring rate throughout the spring's service life
• Improved grip at speed — the reduced body roll and improved suspension geometry provide a noticeable improvement in grip for high-speed driving situations

Dinan Suspension Philosophy — Springs + Handling Kit:

Dinan's suspension systems are unique in the BMW aftermarket because they are engineered as a system — not just a spring set. The Performance Spring Set works in tandem with Dinan's Ride Quality and Handling Kit (bump stops, spring perches, or both depending on application) to maintain correct suspension travel while achieving the lowered ride height and increased spring rate. Without the handling kit, the increased spring rate and reduced ride height can result in the suspension running out of travel — causing harsh impacts over bumps and compromised handling. With the handling kit installed, the suspension travel is correctly maintained and the Dinan system delivers the smooth, controlled ride quality that Dinan customers expect. Dinan sells each component separately but strongly recommends purchasing and installing both together.

F30 335i / 340i xDrive — Platform Context:

The 2013–2018 BMW 335i and 340i xDrive (F30) are among the most capable and popular BMW performance sedans — combining the turbocharged N55 (335i) or B58 (340i) inline-six with xDrive all-wheel drive for exceptional all-weather performance. The F30's suspension is well-engineered from the factory but benefits significantly from Dinan's spring set upgrade — the 30% increase in spring stiffness and lowered ride height transform the F30's handling character from a comfortable sports sedan to a more focused, driver-oriented machine without compromising the daily-driver usability that makes the F30 platform so popular.

Specifications:

• Brand: Dinan
• Part Number: dnnD100-0912
• Barcode: D100-0912
• Spring Rate Increase: 30% over factory
• Ride Height Reduction (335i xDrive): 3/4" front / 3/4" rear
• Ride Height Reduction (340i xDrive): 1" front / 1-1/8" rear
• Material: CNC-wound high-tensile chrome silicon wire
• Treatment: Shot-peened for stress relief
• Shock Compatibility: Conventional and factory electronic (EDC) shocks
• Application: 2013–2018 BMW 335i xDrive / 340i xDrive — F30

Fitment Information:

• 2013–2018 BMW 335i xDrive — F30 — N55 engine
• 2016–2018 BMW 340i xDrive — F30 — B58 engine
• xDrive (AWD) variants — verify RWD (non-xDrive) compatibility separately
• Note: Must be installed with the corresponding Dinan Ride Quality and Handling Kit for correct ride height, ride quality, and handling performance. Verify your specific F30 model year and drivetrain configuration before ordering. Professional installation by an experienced BMW suspension specialist strongly recommended.

What's Included:

• Dinan Performance Spring Set — 2013–2018 BMW 335i / 340i xDrive F30 (dnnD100-0912)
• Front springs (pair)
• Rear springs (pair)
• Refer to Dinan's product documentation for complete kit contents

Installation Notes:

• Professional installation by an experienced BMW suspension specialist strongly recommended — spring replacement on the F30 requires correct spring compressor tools, correct spring perch orientation, and a four-wheel alignment after installation
• Install with the corresponding Dinan Ride Quality and Handling Kit — do not install the spring set alone
• A four-wheel alignment is required after installation — do not drive at speed before alignment is performed
• Verify correct spring seating in the upper and lower spring perches after installation — incorrect spring seating will cause noise and handling issues

Why Dinan?

Dinan is the most respected BMW performance tuning brand in North America — an American company with decades of BMW-specific engineering experience and a product lineup that covers engine, suspension, braking, and exhaust upgrades for a wide range of BMW platforms. Dinan's suspension systems are engineered specifically for BMW's suspension geometry and electronic systems — delivering handling improvements that work with the factory electronics rather than against them. For F30 335i and 340i xDrive owners who want a quality lowering spring set from the most trusted BMW performance brand in North America, dnnD100-0912 is the correct choice.

Perfect For:

• 2013–2018 BMW 335i and 340i xDrive (F30) owners who want Dinan's performance spring set for a 30% stiffer spring rate, reduced body roll, improved suspension geometry, and a lowered ride height — installed with the corresponding Dinan Ride Quality and Handling Kit for correct ride quality and handling performance
• F30 xDrive owners who want a factory electronic shock-compatible lowering spring upgrade from the most trusted BMW performance brand in North America
• BMW enthusiasts who want Dinan's engineered-as-a-system suspension approach — CNC-wound chrome silicon springs, shot-peened for longevity, preset against sag, and designed to work with the factory EDC electronics

IMPORTANT: Must be installed with the corresponding Dinan Ride Quality and Handling Kit — installing without the handling kit will result in poor ride quality and improper handling. Verify F30 335i or 340i xDrive fitment before ordering. Four-wheel alignment required after installation. Professional BMW suspension specialist installation strongly recommended.