I'm looking at diamond racing pro series in the 15"X7" and I'm not sure which backspacing to get. I wanna run 215/75/15 general grabbers and they will definitely not fit with my current backspacing. I have about a centimeter from my 205/55/16's to the strut so I need the backspacing to stick the tire out about an inch or so to clear the strut.

 

anyone use these on imps?

well I was rubbing on my stock wheels with bigger tires on the struts.

 

now I have 215/75's and a better offset.

 

if ur going with the 15x7 go with a 4" or 5" backspacing. that way you won't destroy WB's and other stuff but still have a nice look.

Thanks a lot man, maybe I should just ask you these things on FB haha

 

gonna go with a 4" backspacing then cause they don't have an option for 5".

 

do you know what the backspacing for stock subaru alloys is? I could measure but i'm not at home atm

lets see....

 

5.5in usually a +45 offset for stock..

so thats

 

5.5inx25.4 to convert to mm. which is 139.7 so 140 for esey math

 

then half of that is 70 for the measurement then plus 45 = 115

 

then 115/25.4 to get back to inches = 4.53" of stock back spacing.

 

 

so the diamond racing ones would give you an extra 1/2"

Ok cool. thanks for breaking it down. so an extra 1/2" is 12.7mm extra clearance, which should fit perfect because the increase in tire width is only 10mm from stock.

Perfect.

I know wrx alloy 16" wheels are 55mm offset

Stock outback alloy 16"wheels 45mm

I have Konig incident 15" with a 40mm offset