How to measure a replacement castor
Get the fit right before you order.
A matching wheel diameter is only the start. Record the mounting, installed height and load requirements so you can compare a suitable replacement for your equipment.
Before you measure
Park and safely support the equipment according to its instructions. Photograph the whole castor, its mounting and any model or load markings. Record measurements in millimetres. Do not measure under unsupported equipment.
Wheel size and overall height
Diameter: measure across the wheel centre from one outer tread edge to the opposite edge. Tread width: measure across the rolling surface. Wear can make an old wheel smaller than its original nominal size; check model markings too.
Overall height: measure from the floor-contact point to the mounting face, with the castor positioned as installed. This includes the bracket. A different height can tilt equipment even when wheel diameter matches.
Plate or bolt-hole mounting
Plate: record plate length and width, hole diameters, and centre-to-centre hole spacing in both directions. For slotted holes, check slot dimensions and adjustment range. Matching the outside plate size alone is not enough.
Bolt hole: measure the central mounting-hole diameter and check the fastening arrangement. This is different from the wheel’s axle bore. For a stem or special fitting, send a photo and measurements rather than assuming a bolt-hole fit.
Replacing only the wheel?
Also measure axle bore—the centre hole through which the axle passes—and hub length, the overall width through the hub between the bracket sides. Check bearing type and the existing axle arrangement.
Movement, brakes and loaded weight
Record fixed, swivel or swivel with brake. Check what the offered brake locks. Include the equipment’s own weight plus its maximum carried load. Tell us about surfaces, thresholds and operating conditions. Per-castor ratings do not establish the capacity of the complete equipment.
Send a useful matching request
Send a mounting photo, side view, markings, measurements, quantity and total loaded weight. Say whether you need a complete castor or wheel only. We can help identify an option to check before you buy.
Send measurements on WhatsApp · Shop replacement castors · All castors and wheels