Wheel maths. Please help a not so clever bloke.

[modular9]

Ok fellas I have found some wheels to replace the standard mags on a 77 260z 2+2.

 

Sigma turbo GSR mags. nice condition but before I drop some coin on them I'd like if someone can help me with the maths to see if they will fit.

15 x 6 ( research has led me to believe that they are +20 - please pipe up if this is not the case )

 

So using Nzeder's post in this very same forum :

 

Backspace = (Rim + 1" for beed to beed)/2 +(offset/25.4)

BS = (6+1)/2 +(20/25.4)

BS = 7/2 +  0.787

BS = 3.5 + 0.787

BS = 4.287"

BS = 4.287 x 25.4

BS = 108.9mm

 

So I am assuming these will fit but would it look arse? I have always loved the turbine look to these mags. I know 6 inch is for wimps but i dont know if I want to go the rota rb that everyone else does.

 

Thanks for any help and taking the time to help out.

 

Mike

 

[Zedman240®]

This site may help...

 

http://www.carbibles.com/tyre_bible.html

 

I use it from time to time to match wheel rolling radius of different wheel sizes..and has lots of info about wheel dimensions and calculators.

[chris240]

I know exactly what these look like....very 80's & neatish.. , but why bother with 6" wide rims for a zed..they'll look lonely under the guards  . call me old fashioned but I still dont mind 12 slotters on certain zeds.. (I can hear the vomitting in the background  :-X)