Foam pad size?

[rmcnamara]

The backing plate on my PC measures 4 5/8 inches. Can i use a 5.5 inch foam pad with it.


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[Chrono]

That will work fine. The so-called 5" backing plates are less than 5" and they hold 5.5" pads.

 

[allenk4]

Backing plate should cover to the edge of the Velcro on the foam pad.

Too small and the energy is focused in the center of the pad and the edges don't cut.

Too big and the BP cuts into the back of the foam pad

Way too big and the BP sticks out past the pad where it can damage paint, emblems etc.


Be aware that different BP's may have different hook and loop systems.
I know you are asking about foam, but for example with a Meguiar's Microfiber pad, they suggest that not using the Megs BP can lead to overheating and premature pad and BP failure.

Here is some advice from AGO:

Porter Cable 7424 Backing Plates- Dual Action Hook & Loop backing plate for your porter cable 7424, The best backing plates for the Porter Cable 7424

 

[rmcnamara]

Thanks, according to that guide i should be safe using a 5.5 pad with the backing plate I have


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