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Why do I need 42611-0R271 (wheel disc/ rim) for spare tire conversion?

1.2K views 2 replies 2 participants last post by  nbdyimpt1886  
#1 ·
The spare tire conversion requires 42611-0R271 (wheel disc/ rim) and 155/80R17 (actual wheel)

I thought the donuts come with a rim so why is the 42611-0R271 needed as well?

Thank you. Forgive me for the confusion.
 
#3 ·
Thank you. Is the rim that comes with the donut not sufficient?

For example, is the rim (42611-0R271 ) still needed with this donut spare from ebay? It looks like there is already a rim on it...