Castor arrangements

There are different ways of arranging the castors because of the different requirements concerning the maneuvering ability of a transport device.
 

Here is an overview of the most common castor arrangements including their advantages and disadvantages.

2 swivel castors and 2 pedestal castors with same headroom.

This is the most common castor arrangement. Another alternative: instead of two pedestal castors, two wheels could be mounted on one axle.

Advantages:
+ good going straight ahead
+ good going around bends
Disadvantages:
- poor maneuvering ability in tight spaces

4 swivel castors with the same headroom

 Advantages:
+ good maneuvering ability in tight spaces
+ on the spot rotating
Disadvantages:
- poor maneuvering ablility going straight ahead (possible improvement: using 2 direction locks).

 3 swivel castors with same headroom

Advantages:
+ good maneuvering ability in tight spaces
+ on the spot rotating
Disadvantages:
:- poor maneuvering ability going straight ahead (possible improvement: using 2 direction locks)
- device can tilt easily!

2 swivel and 2 pedestal castors, slightly higher headroom of the pedestal castors

Another alternative: mounting 2 wheels on one axle instead of the 2 pedestal castors.
Advantages:
+ good going straight ahead
+ good going around bends
+ on the spot rotating
+ good maneuvering ability in tight spaces
Disadvantages:
- device can tilt easily!

 4.Pedestal castors, the 2 in the middle with a slightly higher headroom

Another alternative: instead of 2 pedestal castors, 2 wheels could be mounted on one axle.
Advantages:
+ good going straight ahead
+ inexspensive
Disadvantages:
- device can tilt easily!

4.Pedestal castors, the 2 in the middle with a same headroom

Another alternative: instead of 2 pedestal castors, 2 wheels could be mounted on one axle.
Advantages:
+ good load distribution on long devices
+ good going straight ahead
+ good going around bends
Disadvantages:
- most expensive