Maxim, to run the 160 on the back you should ideally be using the HRC wheel. These are available in 5.25" and 5.5".
Squeezing a 160 onto the stock 5" NSR rim (Enkei or Magtek) will actually screw the profile of the tyre up and give you a smaller contact patch!
I'm sure you are aware of this, but others reading this thread may not be.
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Andy.
NSR-WORLD.COM
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