On the 2015 SGs they installed a right angle valve stem in the wheel., when time for new tires that will be the install, tired of burning the hand or cutting on rotor.

 

Here's the shiznit Cobra1, and half the price of the FOBO kit/install$ on Fleabay:
http://www.ebay.com/itm/Accutire-MS-...3D111202383916

 

I like it that the head is at 90 degrees. Mine is angled and I believe that is my main problem, along with big hands.