When replacing the wheels on an existing cart, the most common ordering mistake is "the plate holes don't line up". This article shows you step by step how to measure the top plate so your new wheels fit perfectly without drilling extra holes.
The 4 Measurements You Need
- Top plate size: width × length of the top steel plate, e.g. 100 × 85 mm
- Bolt hole spacing: centre-to-centre distance between holes, across the width and along the length, e.g. 82.5 × 70 mm
- Hole size: hole diameter, and whether the holes are round or slotted
- Wheel size: wheel diameter, e.g. 4 inch or 6 inch
Tip: slotted holes adjust to several spacings more easily than round holes — telling the seller helps them choose more accurately
Common Top Plate Sizes
| Wheel size | Plate (mm) | Hole spacing (mm) |
|---|---|---|
| 4 inch | ~100 × 85 | ~82.5 × 70 |
| 6 inch | ~115 × 100 | ~82.5 × 70 |
Actual values vary by manufacturer, so always measure the real part before ordering
Summary
Measure the 4 values (plate size, hole spacing, hole size, wheel size) and send them to the seller, and your replacement wheels will fit without modification. If you are unsure, a photo of the existing plate next to a ruler also helps.