In order to replace the bolt for the Yakima DoubleDown 4 Bike Rack # Y02424, you need to look at the Replacement Hardware for Yakima Doubledown Hitch Mounted Bike Rack # Y8890206.
•Replacement hardware for Doubledown 2, 4 and 5
•Includes: (1) bolt, (2) flat washers, (1) nut and (1) wrench for rack assembly
(1) hitch bolt, (1) lock washer and (1) flat washer to secure rack in hitch
# 8890206 Yakima Replacement Hardware for Doubledown 2, 4 and 5 Hitch-Mounted Bike Rack view full answer...
You will not need the Bike Frame Adapter Bar for Women's, Children's, and Alternative Frame Bikes # 64005 with the Swagman XTC-2 2-Bike Platform Rack for 1-1/4" and 2" Trailer Hitches # S64670.
That adapter is normally used for hanging-style bike racks to give bikes with step-through frames a vertical mounting point. However, the XTC-2 does not require it; as you can see by the accompanying photo and review a customer sent in of this rack, they were able to use the XTC-2 with a step-through... view full answer...