The weight capacity of an IKEA shoe cabinet can vary depending on the specific model and material. It's important to check the weight capacity information for the specific shoe cabinet you have, which can usually be found on the product page or in the assembly manual. For example, The TRONES shoe cabinet has a weight capacity of 15 kg (33 lbs) per cabinet. The HEMNES shoe cabinet has a weight capacity of 25 kg (55 lbs) per cabinet. It's important to note that the weight capacity is significant not only when it comes to the shoes but also when it comes to any additional shelves or customizations you may want to add to the cabinet. It's also important to remember that the weight capacity is maximum, and it's always safer to distribute the weight evenly across the cabinet and not overload it in one spot.