60mm x 685mm Caravan Spring
Al-ko 60mm x 685mm centre pin spring is fitted to the chassis rails of caravans with the G&S Chassis. Shackle Springs 685mm on manufacturers tandem setups.
Previously, these springs were MAS springs sold by Melbourne Trailers.
G & S Chassis caravan suspension system provides smooth operation under normal highway usage.
This particular 60mm x 685mm spring is shorter than standard tandem springs and is no longer a common spring to obtain.
685mm x 60mm centre pin springs are available in the following capacity
- 6 Leaf – 625 kg per spring
- 7 Leaf – 750 kg per spring
- 8 Leaf – 1000 kg per spring
This particular spring has four wraps around the spring. The spring wrap strengthens the spring and helps remove the weak spots by distributing the load more evenly throughout the spring.
Important: These trailer springs have a centre bolt, not offset.
- 685mm Eye to Eye.
- 5/8″ x 7/8″ x 60mm bush.
- Free Camber 140mm
- Eye to Center Bolt 342.5mm
- 6.5mm Leaf
We suggest to either put your caravan over a weighbridge to get your exact loading.
Spring problems, in most cases, can be resolved with a weighbridge certificate and a set of tow ball scales.
Couplemate highly recommends the use of tow ball scales to help you correctly balance your caravan.
60mm x 685mm caravan spring upgrades are not uncommon on tandem setups. Suspension upgrades tend to re-invigorate your caravans towing capacity to OEM standard in many cases.
It is not uncommon to upgrade broken springs to the next load capacity. However, keep the same ATM intact.
How do I know if my springs are tied and need replacing?
Spring need replacing when they exceed maximum spring deflection.
Generally, max spring deflection is 60mm. If your springs deflect more or are flat, then they need replacing.
Spring camber is measured from a horizontal line between spring eyes and perpendicular at the centre. Measure from this imaginary line to the top of your spring. This measurement can be between 100mm to 120mm.
The surprise comes when you put your rig over the weighbridge. It will explain a lot about the driving characteristics of your rig.