OTOKAR
16 TONNES
22 TONNES
Chassis Extension
We carry out chassis optimisation for greater loading capacity, optimum manoeuvrability and more efficient use of the vehicle chassis.
What is a chassis (frame) extension?
A chassis extension lengthens the vehicle's chassis to provide more usable length for the body. Chassis (frame) optimisation increases loading capacity and makes more efficient use of the chassis.
In our projects, the Isuzu NPR 3D Long raises the maximum body length from 5,450 mm to 6,400 mm, and the Isuzu TORA Long from 6,700 mm to 7,800 mm. In our Mercedes Atego additional axle conversion, the maximum body length on the 5360 UK variant is 8,600 mm.
A chassis extension is usually carried out together with an additional axle conversion; in our Atego catalogue the application is described as "additional axle, chassis extension".
Standard and Long chassis dimensions (mm)
Standard and long chassis dimensions for the Isuzu NPR 3D and TORA. Figures are taken from our Isuzu catalogue.
| Dimension (mm) | NPR 3D | NPR 3D Long | TORA | TORA Long |
|---|---|---|---|---|
| Wheelbase | 3,385 | 3,815 | 3,900 | 4,660 |
| Rear axle spacing | 1,001 | 1,001 | 1,350 | 1,350 |
| Rear overhang (with body, max.) | 1,826 | 2,335 | 2,106 | 2,446 |
| Start of body – end of bumper | 5,100 | 6,000 | 6,300 | 7,400 |
| Maximum length | 7,340 | 8,250 | 8,526 | 9,626 |
| Maximum width | 2,550 | 2,550 | 2,550 | 2,550 |
| Min. body length | 5,200 | 6,250 | 6,200 | 7,300 |
| Max. body length | 5,450 | 6,400 | 6,700 | 7,800 |
Our chassis extension projects
The chassis extension process.
Our processes are designed to interlock with the vehicle manufacturer's, which means maximum transparency and minimum lead time.
Market and Needs Analysis
We analyse the need against technology, market, regulatory and price criteria and define a realistic solution.
3D CAD Design
Design down to the smallest detail. Using 3D CAD speeds up the transition to series production and minimises design errors.
Risk Analysis
Sustainability, maintenance and after-sales considerations are built into the design, and risks are assessed rigorously.
Prototype and Road Testing
Our dedicated prototype team prepares the vehicle; durability and long-distance road tests are carried out with our GPS-linked test equipment.
Homologation
Tests are carried out with authorised technical services, the engineering documentation (project file) is prepared and an application for certification is submitted to TSE.
Delivery
The new configuration is programmed into the vehicle's ECU using our diagnostic equipment, and the vehicle is handed over.
Our chassis extension projects
Chassis extension: frequently asked questions
If you can't find the answer you're looking for here, write to us and our technical team will get back to you.
Ask usIt provides greater loading capacity, optimum manoeuvrability and more efficient use of the vehicle chassis.
On the Isuzu NPR 3D Long the maximum body length rises from 5,450 mm to 6,400 mm, and on the Isuzu TORA Long from 6,700 mm to 7,800 mm.
We work on the Isuzu NPR 3D, NQR 3D and TORA and on the Mercedes Atego. We also carry out chassis modifications on the Otokar Atlas 15T, 11S, 11L, 9S and 9L.
Let's optimise your chassis to suit your needs.
Tell us about your body requirements and your vehicle, and we'll work out the right chassis length together.