BMW X1 2015-2021

BMW X1 2015-2021 Suspension Specifications

Comprehensive technical documentation for the 2015-2021 BMW X1 suspension system, including front and rear suspension components, alignment settings, torque values, and maintenance procedures.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the suspension specifications for the 2015-2021 BMW X1, including key features, measurements, and technical details

How to Use

Use the search function to locate specific suspension components by entering keywords such as 'front strut', 'rear axle', or 'spring rate'.

Navigate through the suspension documentation by selecting the relevant section from the table of contents or using the left-hand sidebar menu.

Key Specifications

Front Spring Rate

28 N/mm

Rear Spring Rate

32 N/mm

Front Anti-Roll Bar Diameter

24 mm

Rear Anti-Roll Bar Diameter

18 mm

Adaptive Damping Response Time

50 ms

Available Specifications

Front Suspension

Detailed information about the front suspension system, including components and specifications

Front Strut Assembly

MacPherson strut design with coil spring
Strut diameter: 50 mm
Spring rate: 28 N/mm
Anti-roll bar diameter: 24 mm
Bushing material: rubber with reinforced polyurethane

Front Control Arms

Material: forged aluminum
Bushings: hydraulic for improved damping
Ball joint diameter: 22 mm
Control arm length: 320 mm
Note: Replace ball joint if wear exceeds 1.5 mm

Note: Regular inspection of control arm bushings is recommended every 30,000 miles.

Rear Suspension

Technical details of the rear suspension system, including measurements and component specifics

Multi-Link Rear Axle

Four-link independent suspension
Spring rate: 32 N/mm
Shock absorber type: twin-tube gas-filled
Anti-roll bar diameter: 18 mm
Trailing arm length: 450 mm

Rear Subframe

Material: high-strength steel
Bushings: rubber with integrated damping
Subframe weight: 15.5 kg
Mounting points: 6
Note: Subframe alignment required after impact

Damping System

Information about the damping components and their specifications

Shock Absorbers

Front shock absorber stroke: 120 mm
Rear shock absorber stroke: 110 mm
Damping force: 1,800 N (compression), 2,200 N (rebound)
Oil capacity: 350 ml per shock
Note: Replace shocks if oil leakage is detected

Adaptive Damping System

Available in M Sport package
Adjustable damping modes: Comfort, Sport, Sport+
Response time: 50 ms
Sensors: 4 (one per wheel)
Note: System recalibration required after component replacement

Search Specifications

Search by specification name, value, or description

Component Specifications

Front Suspension

Type: MacPherson strut

Spring Rate: 22.5 N/mm

Shock ABSorber Type: Gas-filled monotube

Stabilizer Bar Diameter: 25.5 mm

Bushings Material: Synthetic rubber with steel reinforcement

Part Numbers: Strut Assembly: 31-31-6-857-123
Stabilizer Bar Link: 31-35-6-857-456
Control Arm: 31-12-6-857-789

Rear Suspension

Type: Multi-link independent

Spring Rate: 20.0 N/mm

Shock ABSorber Type: Gas-filled twin-tube

Stabilizer Bar Diameter: 22.0 mm

Bushings Material: Polyurethane with aluminum housing

Part Numbers: Trailing Arm: 33-55-6-857-321
Lateral Link: 33-55-6-857-654
Shock ABSorber: 33-52-6-857-987

Alignment Specifications

Front Camber: -0.5° to +0.5°

Front Toe: 0.10° to 0.20°

Front Caster: +6.5° to +7.5°

Rear Camber: -1.5° to -0.5°

Rear Toe: 0.15° to 0.25°

Thrust Angle: 0.0° ± 0.2°

Tire Specifications

Recommended Tire Size: 225/50R18

Tire Pressure Front: 32 psi

Tire Pressure Rear: 32 psi

Load index: 95

Speed Rating: V (240 km/h)

Ride Height

Front Ground Clearance: 170 mm

Rear Ground Clearance: 175 mm

Measurement Point: From lowest point of chassis to ground

Shock ABSorber Specifications

Front Compression Force: 1200 N at 0.3 m/s

Front Rebound Force: 800 N at 0.3 m/s

Rear Compression Force: 1000 N at 0.3 m/s

Rear Rebound Force: 700 N at 0.3 m/s

Operating Temperature Range: -40°C to +120°C

Stabilizer Bar Specifications

Front Bar Material: High-strength steel

Rear Bar Material: High-strength steel

Front Bar Torsional Stiffness: 4500 Nm/rad

Rear Bar Torsional Stiffness: 3800 Nm/rad

Bushing Durometer: 70 Shore A

Suspension Bushings

Front Lower Control Arm Bushing Durometer: 75 Shore A

Rear Trailing Arm Bushing Durometer: 70 Shore A

Bushing Replacement Interval: Every 100,000 miles or 8 years

Bushing Tolerance: ±0.5 mm

Diagnostic Specifications

Suspension Warning Indicators

Electronic Damper Control (EDC) fault
Suspension leveling system error
Excessive body roll detected

Diagnostic Tools

BMW ISTA diagnostic software
OBD-II scanner with BMW-specific codes

Common Fault Codes

C1210 - Suspension system malfunction
C1215 - EDC valve fault
C1220 - Ride height sensor error

Maintenance Specifications

Strut Replacement interval: Every 80,000 miles or 6 years

Shock ABSorber Replacement interval: Every 80,000 miles or 6 years

Bushing Inspection Interval: Every 30,000 miles or 2 years

Alignment Check interval: Every 15,000 miles or 1 year

Torque Specifications: Strut Mount Nuts: 45 Nm
Control Arm Bolts: 90 Nm + 90°
Stabilizer Bar Link Nuts: 40 Nm

Service Information Service

Detailed service requirements and schedules for the suspension system

15,000 miles

12 months

Inspect suspension bushings for wear
Check shock absorbers for leaks
Verify ride height and alignment

Perform visual inspection and road test

30,000 miles

24 months

Lubricate suspension components
Inspect stabilizer bar links
Check torque on all suspension bolts

Use BMW-approved lubricants

60,000 miles

48 months

Replace shock absorbers if necessary
Inspect and replace bushings as needed
Perform full suspension alignment

Follow BMW torque specifications

Frequently Asked Questions

Find answers to common questions about torque specifications

What type of suspension system does the 2015-2021 BMW X1 use?

The 2015-2021 BMW X1 features a MacPherson strut front suspension and a multi-link rear suspension. This setup provides a balance of comfort and sporty handling, with specific tuning for the X1's dynamic driving characteristics.

What is the ground clearance of the 2015-2021 BMW X1?

The ground clearance of the 2015-2021 BMW X1 is approximately 7.2 inches (183 mm). This measurement ensures adequate clearance for urban driving while maintaining a low center of gravity for improved stability.

Can the suspension be adjusted or upgraded on the BMW X1?

The standard suspension on the BMW X1 is not adjustable. However, BMW offers optional Adaptive M Suspension, which includes electronically controlled dampers that adjust to driving conditions. Aftermarket upgrades are also available but may void the vehicle's warranty if not installed by an authorized BMW service center.

What is the recommended maintenance schedule for the suspension components?

BMW recommends inspecting the suspension system every 10,000 miles or annually, whichever comes first. Key components such as struts, shocks, bushings, and control arms should be checked for wear and replaced as necessary. Always refer to the official BMW service manual for detailed procedures.

What are the torque specifications for the suspension bolts?

The torque specifications for suspension bolts vary by component. For example, the front strut-to-knuckle bolts should be torqued to 81 lb-ft (110 Nm), while the rear lower control arm bolts require 74 lb-ft (100 Nm). Always use a calibrated torque wrench and follow the official BMW repair manual for precise values.

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 X1 Suspension System Overview

Coming Soon

A detailed guide to the suspension system of the 2015-2021 BMW X1, including diagrams and component descriptions.

Adaptive M Suspension Technical Manual

Coming Soon

Technical documentation for the optional Adaptive M Suspension system, including installation and calibration procedures.

BMW X1 Suspension Maintenance Checklist

Coming Soon

A comprehensive checklist for inspecting and maintaining the suspension system of the BMW X1.

BMW Genuine Suspension Parts Catalog

Coming Soon

An official catalog of genuine BMW suspension parts for the 2015-2021 X1, including part numbers and compatibility details.

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