Firestone Catalog

Convoluted Style Springs

Firestone convoluted Airide springs are available in three

styles–single, double, or triple convoluted–as shown above.

To identify the exact style and part number to replace

your current air spring, you need to identify the type of

bellows, bead plates, and attaching hardware used, as well

as determining whether the spring has an internal bumper.

First, look for the manufacturer’s part number and

Firestone order number stamped in ink on the bead plate.

If illegible, read the part number molded on the bellows,

normally under the Firestone name. If the number (20, 22,

etc.) is present, simply refer to the proper section of this

guide.

If for any reason the number is unreadable, you can

determine the bellows type with two simple measurements.

Remove the air entrance and allow the bellows to assume

its normal shape. Then, measure the bead plate diameter

and the outer diameter of the bellows, as shown below.

Compare these diameters with those listed in the bellows

index for the specific type of convoluted (single, double or

triple) bellows that you have.

To determine the presence of an internal bumper in

the spring, remove the air and collapse the spring to its

minimum height. Then, measure this height, as shown

below, and compare that measurement with those listed in

the proper section of this guide.

Finally, to complete the parts identification, compare

the metal bead plates and attaching hardware with the

assemblies detailed in that same section of the guide.

For your convenience, typical types of attaching hardware

are illustrated below.

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