H&R Sport Springs – BMW 335i Sedan (E90, N54/N55)

OVERVIEW

H&R Sport Springs are the best-selling performance street spring for BMW, and swapping the factory springs is one of the first steps in suspension tuning. On the E90 335i sedan they lower the center of gravity and cut body roll for better handling and chassis balance, with an aggressive but driveway-friendly stance.

Sport Spring rates are progressive and increased 10–20% over stock, so ride quality stays composed in normal driving and firms up when the road gets twisty. The lower frontal profile also reduces wind resistance.

Every H&R spring is cold-wound from 54SiCr6 spring steel and shot-peened, which H&R states increases spring life by more than 200%. The springs will not settle or sag, and each one is 100% tested before leaving H&R's ISO 9001-certified production facility in Germany.

SPECS

• Approx. front lowering: 1.3"
• Approx. rear lowering: 1.2"
• Spring rate increased 10–20% over stock
• Progressive-rate spring design
• Cold-wound from 54SiCr6 spring steel
• Shot-peened; H&R states this increases spring life by more than 200%
• Will not settle or sag
• TÜV approved and ISO 9001-certified production
• Manufactured in-house by H&R in Germany; every spring 100% tested before shipping

PARTS INCLUDED

• H&R Sport Spring set — front and rear springs
• Complete kit as supplied by H&R Springs; see the installation instructions for the full bill of materials.

TECH RESOURCES

Additional Parts Required

• Four-wheel alignment after installation. H&R requires the wheel alignment to be checked any time ride height is changed.
• Professional installation. H&R states its springs and suspensions should be installed by professional suspension mechanics only.
• A spring compressor is required to disassemble the factory struts.
• Sport Springs are designed to work with serviceable factory dampers; worn shocks should be replaced at the same time.
• If your car is fitted with EDC / adaptive dampers, confirm compatibility with Speed Logic before ordering.

Installation

• H&R Springs Technical Information Sheet (PDF) — official H&R installation, ride-height measurement, bumpstop trimming and alignment instructions.

Notes

• H&R also catalogs 50490-4 for the E93 335i Convertible. Confirm your exact chassis, engine and build date with Speed Logic before ordering.

PART NUMBER

• 50490-4

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