BMW E81 / E82 / E87 / E88 1 Series, E90 / E91 / E92 / E93 3 Series & E84 X1 Rear Trailing Arm Monoball Bearing Set 2005 - 2015 (Replaces 33326763092)

Eliminate the rear suspension deflection plaguing your BMW E9X / E8X chassis with this premium rear trailing arm monoball bearing set, precision manufactured from 40Cr alloy steel for permanent durability and dramatically improved suspension precision. The BMW E90 / E91 / E92 / E93 / E81 / E82 / E87 / E88 / E84 rear suspension uses a complex five-link geometry where the trailing arm connects the subframe to the main axle through factory rubber bushings — and these factory bushings are notorious for deforming under aggressive driving loads, causing dramatic changes in toe and camber geometry during braking, acceleration, and cornering that result in handling instability, rear-end deflection, and unpredictable behavior at the limit. This monoball bearing upgrade replaces the compliant factory rubber bushings with rigid spherical bearings that maintain consistent suspension geometry under all driving loads, delivering precision handling, sharper steering response, and clearer road feedback for drivers who demand serious performance from their BMW chassis.

Features:

• Precision-machined monoball bearings – sized identically to factory bushings for non-destructive replacement using proper tools
• Premium 40Cr alloy steel construction – delivers exceptional strength, durability, and consistent geometry control under sustained suspension loads
• Dust cover seal design – keeps debris out and locks lubrication grease in for extended service life and reduced wear compared to bare spherical bearings
• Precision handling improvement – stabilizes camber and toe geometry during cornering, acceleration, and braking for sharper steering response
• Direct road feedback – monoball geometry transfers spring and damper forces to the ground without rubber bushing compliance lag
• Low NVH increase – engineered specifically for quiet, daily-drivable operation with minimal harshness compared to typical full-bearing alternatives
• Complete 4-piece set – addresses both rear trailing arm bearing positions for a coordinated suspension upgrade

Specifications:

• Condition: 100% Brand New
• Type: Rear Trailing Arm Monoball Bearing Set
• Material: 40Cr Alloy Steel
• Sealing: Dust Cover Seal Design
• Item Weight: 1.121 kg
• Quantity: 4 monoball bearings per set
• Position: Rear Trailing Arm
• Recommended Use: Street Performance
• NVH Increase: Low
• Purpose: Performance Upgrade / Suspension Geometry Stabilization

OE / Replacement Part Numbers:

• 33326763092 / 33 32 6 763 092

Fitment:

• BMW 1 Series: E81 / E82 / E87 / E88 (2005 – 2013)
• BMW 3 Series: E90 / E91 / E92 / E93 (2005 – 2013)
• BMW X1: E84 (2010 – 2015)
• Compatible with factory rear trailing arm mounting points only – verify your factory bushing part number (33326763092) before ordering
• Confirm vehicle model, chassis code, and production year before ordering

Contents:

• 4x Rear Trailing Arm Monoball Bearings (with Dust Cover Seals)

Benefits:

• Permanently eliminates the rear suspension deflection caused by deformed factory rubber bushings – a known weak point of the E9X / E8X chassis under aggressive driving
• Maintains consistent rear toe and camber geometry under braking, acceleration, and cornering loads – critical for predictable handling at the limit
• Sharpens steering response by eliminating rubber bushing compliance lag – every steering input transfers directly to the rear suspension without delay
• Improves road feedback through the chassis – drivers feel surface conditions and grip levels more clearly, enabling better driver inputs
• 40Cr alloy steel construction delivers significantly higher strength than factory rubber alternatives, eliminating the recurring failure mode of compliance bushings
• Dust cover seal design provides extended service life compared to bare monoball bearings, with reduced wear and noise development over time
• Engineered for low NVH increase – maintains daily driveability and ride comfort while delivering meaningful performance improvements
• Significant cost savings compared to high-end aftermarket spherical bearing kits while delivering equivalent performance benefits

Installation Notes:

• Specialized tools required: Trailing arm bushing replacement requires a hydraulic press or proper bushing extraction/installation tools – do not attempt installation without correct equipment
• Vehicle wheel alignment is mandatory after installation – trailing arm bearing replacement directly affects rear toe and camber specifications
• Replace bearings on both left and right sides simultaneously to maintain consistent rear suspension geometry – installing on only one side will cause asymmetric handling
• Apply manufacturer-specified grease to the monoball bearings during installation – do not run bearings dry, as this will accelerate wear and cause noise
• Inspect surrounding suspension components during installation – worn trailing arms, sway bar links, or other rear suspension components will compromise the performance benefits of upgraded bearings
• Bed in the new bearings with progressively increased driving loads over the first 100-200 miles before aggressive driving
• Professional installation strongly recommended – rear trailing arm service requires suspension geometry knowledge and proper torque specifications
• If unsure about compatibility with your specific BMW variant or chassis code, contact our team with your year, model, and chassis code (E81 / E82 / E87 / E88 / E90 / E91 / E92 / E93 / E84) before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues

Warranty Assurance:

At K2 Industries, your satisfaction is our priority, and we stand behind the quality of our products. Here's a brief overview of our warranty:

Defect Coverage:
If you find a defect after receiving your order, get in touch with us. We're committed to resolving the issue, whether it involves a replacement, repair, or refund.

Installation Note:
Please inspect your purchase before installation. Unfortunately, damages post-installation are not covered, so ensure everything looks good beforehand.

Claims Made Simple:
Need to make a claim? Reach out to us at support@k2-industries.com. We're here to assist you. Just keep your original packaging and documentation handy.

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Your trust in K2 Industries is appreciated. We're dedicated to ensuring your satisfaction with our quality automotive parts.

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