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Read this if you run wheel spacers

3.5K views 47 replies 13 participants last post by  Tsaico  
#1 ·
I run Rennline 10mm front and 12mm rear spacers on my 2018 Cayman GTS with 20" wheels (the brand of spacer is not important - this issue can happen with any spacer and is not the fault of the spacer manufacturer). I recently came across this video on Youtube, which prompted me to look at the fit of my own spacers. Sure enough, my spacers were exhibiting the exact problem identified in this video. In examining the fit further, the spacers sat snugly on the rotor hub, but wobbled ever so slightly (and failed the paper test) when placed against the wheel. The evidence of this is a shiny band on the bevel of the wheel spacer where it contacts the inner edge of the wheel (See red arrow in photo below). To correct this, I picked up a 45 degree. 5" chamfering cone, and beveled the inner lip of each wheel until the spacers sat snugly with no wobble. I thought I'd pass this along as an important safety tip for anyone else that is running spacers. Losing a wheel (and likely crashing) due to this would really suck.

Wheel inner edge before:
Image


Shiny ring on spacer is evidence of poor contact:
Image


Chamfering cone:
Image


After - perfect fit:
Image
 

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Discussion starter · #4 ·
Actually, my years of selling and servicing wheels and tires makes me think that it IS the fault of the spacer manufacturers. If the mounting surface and hub on the car does not have a bevel at the base of the centering hub, the spacer shouldn't have that either. Poor R&D in my mind. The end user should not have to modify their factory wheels to use a spacer.
The problem, as mentioned in the video, is that there is no standard for that interface so wheel and spacer manufacturers are free to do whatever they want. Some put a big bevel and others put no bevel (and everything in between).
 
Discussion starter · #8 ·
There is no way I'm going to modify my factory wheels to fit a spacer. To me that is just wrong.
MOO & FWIW
That's fine. That's not the point of my post. The point is that if you've installed spacers you need to check if they're seated properly or you run the risk of catastrophic failure. If you're not comfortable with a slight modification to your wheels then buy different spacers or remove them altogether.