If you have an older, heavier piano, we also recommend getting larger caster cups, and they will help displace the weight over a larger surface area. In terms of appearance, if you have a larger grand piano, it does look more proportional to have larger caster cups (the 4.5” or 5”), even if the 3.5” models would fit. Please note an exact fit will not work, and you do need some additional space for the wheel (if your wheel is 1-3/4” wide, you would not want a cup with 1-3/4” inner diameter-get the next size up). When choosing the correct size caster cup, you will need to know the width of your piano wheels, to make sure that they will fit inside the inner diameter of the caster cup (the 1-3/4” in our above example). For example, the 3.5” Jansen piano caster cups have an overall outer diameter of 3.5”, and an inner diameter of 1-3/4”. Piano caster cups have two measurements, an outer diameter (which is what they are listed by), and an inner diameter (the bowl area of the cup where the wheel actually goes).
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