Suspension Tandem e Tridem

Mechanical Suspension
Tandems and trindems

The modular mechanical suspensions.
K by ADR epitomises the simplicity and efficiency in mechanical suspension units available on the market. Supported by adjustable rubber bushed tie rods, all linkages ensure maximum reliability with minimal maintenance requirements.
Additionally, the short and rigid brackets for vehicle chassis assembly effectively reduce torsion reactions during cornering. Its high modularity caters to the diverse requirements of vehicle manufacturers, eliminating the necessity to maintain large stocks of spare parts.


Standard wheelbase from 910 to 1850 mm with 2, 3 or 4 leaf para- bolic springs 76, 80 and 100 mm wide. The following pages show the range KA, KD, KE, KB, KW with the following features:
  • KA and KD: parabolic spring 80 and 100 mm wide, simplified version for agricultural machinery.
  • KE and KB: parabolic spring suspension, 76 and 100 mm wide, with torque arms, to fit medium and heavy trailers at speed over 40 km/h.
  • KW: is the heavy-duty, with multi-leaf springs 100 mm wide and reinforced structure.
In the catalogue both the unladen (A) and laden height (B) are marked. These heights always refer to a horizontal vehicle. On semitrailers the angle of the chassis plays an important part on both tandem and tridem suspensions, reducing the equalizer movement, causing the equalizer to strike the frame in uneven road conditions. In this case the slope of the laden chassis must be accurately evaluated and packing pieces must be added to the spring seats. Standard 30 mm spacers are available.
Alternatively, a tapered spacer can be welded between the hanger bracket and the main frame: tapered spacers are not standard pieces and are not supplied with the kits. Care is needed with the tridem, because the angle must be compensated on three brackets. Only a precise calculation of the required packings ensures proper weight distribution on the axles and extends tyre life.
Further attention is required if one or more of the axles is a self steering unit. Please don’t hesitate to ask our technical department for details.

Contacts and information

Fax. +39 02 96171420
Contact us