Heavy-duty Air Suspension


FIREMAAX® EX heavy-duty rear air suspension delivers the superb ride, stability, and handling required for fire and rescue vehicles. Combining a robust design with performance enhancing features, FIREMAAX EX provides a package of benefits previously unavailable in any one emergency vehicle air suspension.


Model FMX 242 FMX 272 FMX 312 FMX 482 FMX 542 FMX 622
Capacity (lbs.) 24,000 27,000 31,000 48,000 54,000 62,000
Installed Weight1 (lbs.) 550 658 665 1,090 1,305 1320
Axle Configuration Single Single Single Tandem Tandem Tandem
Axle Travel2 (in.) 8 8 8 8 8 8
Ground Clearance3 (in.) 10.75 10.5 10.5 10.75 10.5 10.5
Ride Heights4 (in.) 8.5 to 15.5 8.5 to 12.5 8.5,10,13 8.5 to 15.5 8.5 to 12.5 8.5,10,13
Axle Spacing (in.) N/A N/A N/A 52 to 72.5 54 to 72.5 54 to 72.5
Disk Brake Compatibility Yes Yes No Yes Yes No

1. Installed weight includes complete suspension, torque rods, axle and frame brackets and all hardware. Published weight is based on a standard FIREMAAX EX suspension compatible with drum brakes using 10.0-inch ride height. Other configurations may vary.

2. Axle travel may be limited by vehicle manufacturer; axle stop settings and shock stroke may restrict suspension's articulation. Varying ride heights and configurations may restrict travel.

3. Ground clearance is based on a standard FIREMAAX EX suspension with 11R22.5 tire size.

4. For different ride height options, please contact Hendrickson (630-910-2800), your truck manufacturer or your dealer.

Features & Benefits


About Us

Hendrickson is a leading manufacturer and supplier of premium fire/rescue suspension components to global markets.

Our legacy embodies over 100 years as the leading innovator and manufacturer of suspension systems and components for the global heavy-duty vehicle industry.

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Hendrickson Fire/Rescue
800 South Frontage Road
Woodridge, IL 60517