You’ll find several types of bicycle rear racks. Each comes with different features and characteristics. Hence, each may have different weight capacities. Usually, when it comes to weight, the racks can hold weights from 20 to 5 pounds. However, some racks come in sturdier built that allows you to load up to 130 pounds. However, make sure that you check the specification of the model before you load anything on your rack. It is generally on the package, or you can confirm it with the seller.