How best to calculate the correct wheel or castor


Our guide to selection

The following wheel and castor guide discusses how best to choose the correct wheel or castor, as other factors can and will play an important part for example you may only want or need to move something once or occasionally so your purchasing criteria maybe more price orientated. If the castors or wheels are likely to play a more important roll, then price is less important than life expectancy and how well the unit will work when used. If you are manually pushing then the easier the movement, the less likely injury from repetitive usage your employees will have. If however aesthetics is more important, design will be the purchasing factor. Whatever your reasons for purchasing wheels and castors online, we can help you find the correct product for you or your application.

  • Calculate total weight load, including frame / trolley
  • Floor condition good, bad or indifferent
  • Wheel type - the harder the wheel the lower the rolling resistance
  • Floor damage, use a tyred wheel - no hard tread wheels
  • Cycle or duty to determine service factor required
  • Manual or mechanical, handled or towed (use only towable castors and wheels)
  • Likely impact damage - perhaps being pushed on or off kerbs
  • Wheel hits obstacle at more than 20 degrees - can course damage
  • If towed what speed, distance and obstacles 
  • Temperature
  • Expected life cycle required 
  • Will weather or environment have an effect - will you require stainless steel

There are several popular wheel and castor configurations:

  • 4 swivel castors which can help with tight areas 
  • 2 swivel & 2 fixed when steering is required
  • 2 swivel & 2 swivel braked
  • 2 swivel with directional locks & 2 swivel braked - if controlled movement is required
  • 4 swivel & 2 centrally located fixed - often known as rocking trolley for tight working areas 
  • 4 fixed & 2 located swivel

Simple formula to test ISO2175



Test Condition and detail


Load one castor is expected to maintain whilst operational


Not more than 4km/hour


+/- 10 Degrees 20 degrees centigrade

Floor Condition

Tested with hard rolling surface, surface Obstacle 5% of wheel diameter and not greater than 90 Shore A less for harder wheels. Obstacle size 100mm width between 2.5% and 5mm radius

Cycle Running Time

Maximum 4 minutes with 25% stopping cycle time