BMW Z4 2018-present

BMW Z4 2018-present Suspension Specifications

Detailed technical specifications and maintenance guidelines for the suspension system of the 2018-Present BMW Z4, including front and rear suspension components, shock absorbers, springs, and alignment settings.

Updated Oct 14, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2018-Present BMW Z4, including key features, measurements, and technical details. This section provides an in-depth look at the front and rear suspension systems, alignment specifications, and critical components.

How to Use

Use the search function to locate specific suspension specifications by entering keywords such as 'front suspension', 'rear suspension', or 'alignment settings'.

Navigate through the suspension documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Front Spring Rate

22.5 N/mm

Rear Spring Rate

25.0 N/mm

Front Stabilizer Bar Diameter

24 mm

Rear Stabilizer Bar Diameter

18 mm

Turning Circle

11.2 m

Available Specifications

Front Suspension

Details about the front suspension system, including the type of suspension, key components, and technical specifications.

MacPherson Strut Design

Type: MacPherson strut with lower control arm
Spring rate: 22.5 N/mm
Shock absorber type: Twin-tube gas-filled
Stabilizer bar diameter: 24 mm
Track width: 1560 mm

Steering and Alignment

Steering type: Electric power-assisted rack-and-pinion
Caster angle: 7.5°
Camber angle: -0.5°
Toe-in: 0.15°
Turning circle: 11.2 m

Note: Alignment settings are critical for optimal handling and tire wear.

Rear Suspension

Information on the rear suspension system, including the multi-link design, damping characteristics, and alignment specifications.

Multi-Link Suspension

Type: Five-link independent suspension
Spring rate: 25.0 N/mm
Shock absorber type: Monotube gas-filled
Stabilizer bar diameter: 18 mm
Track width: 1580 mm

Alignment and Geometry

Camber angle: -1.2°
Toe-in: 0.20°
Ride height: 135 mm (measured from wheel center to fender)
Anti-squat and anti-dive geometry optimized for sporty handling

Note: Rear suspension geometry is designed to enhance stability during cornering.

Adaptive Suspension

Details about the optional adaptive suspension system, including its components, functionality, and performance characteristics.

Dynamic Damper Control

Type: Electronically controlled dampers
Adjustable modes: Comfort, Sport, Sport+
Response time: 20 ms
Damping force range: 500-1500 N
Integration with driving modes via iDrive system

Performance Benefits

Improved ride comfort in Comfort mode
Enhanced handling and stability in Sport modes
Automatic adjustment based on road conditions
Reduced body roll during aggressive driving

Note: Adaptive suspension is optional and requires the M Sport package.

Wheel and Tire Specifications

Technical details about the wheel and tire setup, including sizes, pressures, and compatibility with suspension components.

Standard Wheel and Tire Setup

Wheel size: 18-inch alloy wheels
Tire size: 225/45 R18 (front), 255/40 R18 (rear)
Tire pressure: 2.2 bar (front), 2.4 bar (rear)
Load rating: 91 (front), 95 (rear)
Speed rating: Y (up to 300 km/h)

Optional M Sport Setup

Wheel size: 19-inch M light alloy wheels
Tire size: 255/35 R19 (front), 275/35 R19 (rear)
Tire pressure: 2.3 bar (front), 2.5 bar (rear)
Load rating: 93 (front), 97 (rear)
Speed rating: Y (up to 300 km/h)

Note: M Sport wheels and tires are designed for enhanced performance and aesthetics.

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: Double-wishbone with adaptive dampers

Spring Rate: 32 N/mm

Damper Type: Electronically controlled adaptive dampers

Stabilizer Bar Diameter: 25 mm

Track Width: 1572 mm

Part Numbers: Strut Assembly: 31-31-6-860-123
Stabilizer Bar: 31-35-6-860-456
Control Arm: 31-12-6-860-789

Rear Suspension

Type: Multi-link with adaptive dampers

Spring Rate: 28 N/mm

Damper Type: Electronically controlled adaptive dampers

Stabilizer Bar Diameter: 22 mm

Track Width: 1580 mm

Part Numbers: Strut Assembly: 33-31-6-860-124
Stabilizer Bar: 33-35-6-860-457
Trailing Arm: 33-12-6-860-790

Adaptive Suspension

System Name: Adaptive M Suspension

Adjustment Range: 10 levels of damping force

Response Time: 20 ms

Operating Temperature Range: -40°C to 85°C

Part Numbers: Control Module: 61-31-6-860-125
Sensor Kit: 61-35-6-860-458

Wheel Alignment

Front Camber: -0.5° to -1.5°

Rear Camber: -1.0° to -2.0°

Front Toe: 0.10° to 0.20°

Rear Toe: 0.15° to 0.25°

Caster Angle: 7.5° to 8.5°

Tolerance: ±0.3°

Ride Height

Front Ground Clearance: 120 mm

Rear Ground Clearance: 125 mm

Adjustment Range: ±10 mm

Tolerance: ±2 mm

Bushings And Mounts

Front Control Arm Bushing Material: Hydro rubber

Rear Trailing Arm Bushing Material: Hydro rubber

Strut Mount Material: Polyurethane

Part Numbers: Front Bushing: 31-12-6-860-791
Rear Bushing: 33-12-6-860-792
Strut Mount: 31-31-6-860-126

Torque Specifications

Front Strut Mount Nuts: 50 Nm

Rear Strut Mount Nuts: 55 Nm

Stabilizer Bar Link Nuts: 40 Nm

Control Arm Bolts: 90 Nm

Trailing Arm Bolts: 100 Nm

Diagnostic Specifications

Fault Codes

C1A20 - Adaptive Damper Control Module Fault
C1A21 - Front Left Damper Sensor Fault
C1A22 - Front Right Damper Sensor Fault

Diagnostic Tool: BMW ISTA

Test Procedures

Check damper resistance (10-20 ohms)
Verify sensor voltage (2.5-4.5 V)
Inspect wiring harness for damage

Maintenance Specifications

inspection Interval: Every 30,000 miles or 24 months

Lubrication Points

Control arm bushings
Stabilizer bar links
Strut mounts

Replacement intervals: Dampers: Every 60,000 miles
Bushings: Every 50,000 miles
Stabilizer Bar Links: Every 40,000 miles

Safety information

Max Load Front Axle: 950 kg

Max Load Rear Axle: 900 kg

Max Speed With Damage: 80 km/h

Warning: Do not exceed specified torque values during assembly

Service Information Service

Detailed service requirements and schedules for the suspension system

30,000 miles

24 months

Inspect suspension components for wear
Check damper operation
Verify wheel alignment

Replace worn components as necessary

60,000 miles

48 months

Replace adaptive dampers
Inspect and lubricate bushings
Check stabilizer bar links

Use only BMW-approved parts

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system does the 2018-Present BMW Z4 use?

The 2018-Present BMW Z4 features a double-wishbone front suspension and a multi-link rear suspension. This setup provides a balance of sporty handling and ride comfort, with precise wheel control and reduced unsprung weight.

What is the ground clearance of the BMW Z4?

The ground clearance of the BMW Z4 is approximately 120 mm (4.7 inches). This measurement ensures optimal aerodynamics and stability while maintaining sufficient clearance for most driving conditions.

Can the suspension be adjusted for different driving modes?

Yes, the BMW Z4 offers an Adaptive M Suspension system as an option. This system adjusts damping characteristics based on the selected driving mode (Comfort, Sport, or Sport+), providing tailored handling and ride quality.

What is the recommended tire pressure for the BMW Z4?

The recommended tire pressure for the BMW Z4 varies by trim and tire size. For example, the sDrive30i typically requires 32 psi (2.2 bar) in the front and 35 psi (2.4 bar) in the rear. Always refer to the tire pressure label on the driver's door jamb for specific values.

How often should the suspension components be inspected?

BMW recommends inspecting the suspension components every 10,000 miles or during routine maintenance. This includes checking for wear on bushings, ball joints, and shock absorbers, as well as ensuring proper alignment.

What is the wheel alignment specification for the BMW Z4?

The front wheel alignment for the BMW Z4 typically includes a camber angle of -0.5° to -1.0°, a caster angle of 7.0° to 8.0°, and a toe-in of 0.10° to 0.20°. Rear alignment includes a camber angle of -1.5° to -2.0° and a toe-in of 0.10° to 0.20°.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

BMW Z4 Suspension System Overview

Coming Soon

Detailed technical overview of the BMW Z4 suspension system, including diagrams and component descriptions.

Adaptive M Suspension User Guide

Coming Soon

A guide to understanding and using the Adaptive M Suspension system in the BMW Z4, including driving mode adjustments.

BMW Z4 Wheel Alignment Specifications

Coming Soon

Comprehensive guide to wheel alignment settings for the BMW Z4, including recommended values and adjustment procedures.

Suspension Maintenance Checklist

Coming Soon

A step-by-step checklist for inspecting and maintaining the suspension system of the BMW Z4.

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