Box components Box One RR 20in 28H RimFocus rims have a no nonsense low profile design that eliminates excess material making them some of the lightest weight double wall rims available. Strong and true Focus rims have single eyelets to help prevent spoke pull through which means higher spoke tensions are possible. Front and rear specific designs Specifications: Diameter 20in Brand Box Model Focus RR ISO 451 ID Width 12 Width OD 18 Profile 14. 3 Wall Dbl Side NMSW Color Black Hole Count