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Can anyone tell me what the difference is between the R171 and R172 wheels. Having checked the diameter of the studs on my 2012 R172 AMG 55 and my old R171 350 it would appear the stud diameter is 14mm on the R172 and 13mm on the 171, is this correct and the only difference or is the PCD different as well. I want to get 4 wheels set up for winter weather and whenever I see a set of wheels I fancy the company selling doesn't know if there is a difference or not. Can anyone enlighten me? :|
 

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Super Moderator CA 2012 SLK55 AMG w/P30
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Premium Member 2005 SLK55 AMG; 2005 SLK350
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4,617 Posts
It looks like summit sells these in the US.

So in these measurements does "R14" indicate the shape of the seat as a sphere with "Radius 14MM"?
 
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