Curt Manufacturing, Extend. Bike Rack Replacement Arms #18021 Bike Capacity 4 Model# 18020

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- Increases CURT bike rack #18021 to 4-bike capacity
- Easy bolt-on installation
- Removable design allows bike rack to return to 2-bike capacity as needed
- Adjustable rubber cradles will not scratch bike frames
- Protected by a durable black powder coat finish
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