18 by 8 or 18 by 8.5?

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Sep 15, 2004 | 08:28 PM

#16

MO REX

VIP Member

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Joined: Dec 2003

Posts: 1,245

From: St. Louis MO

Car Info: 02 PSM WRX

Quote:

Originally Posted by ppat

I dont completely understand everything. I thought that the offset and everything was specifically for subaru wrx. Like +100 and 46 or w/e the numbers are, can you just change those, or maybe im confused, what do those numbers actually mean?

Offset is the distance from the center line of the wheels width to the mounting surface. The factory wheels are 6.5"s wide and need a specific offset (around +53-+55) but when you go wider the offset will need to change so your tires dont rub the struts. I think +43-+47 would work good on a wheel that is 8"s and around +43-+40ish on a wheel that is 8.5"s.(not sure those #'s are correct). Hopefully there is someone here that will tell you the exact #'s for those widths. Scroll to the bottom of this thread for a good explination of how offsets work https://www.i-club.com/forums/wheel-tire-59/official-tech-thread-tire-rack-55297/.

Last edited by MO REX; Sep 16, 2004 at 03:00 PM.

Sep 15, 2004 | 11:30 PM

#17

Kevin M

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Joined: Nov 2002

Posts: 18,369

From: Reno, NV

Car Info: 1993/2000/2001 GF4 mostly red

No, the wheel bearings want the offset to stay the same. The reason you have to go to a smaller offset with a wider wheel is so the tire isn't conflicting with the strut housing.

Sep 16, 2004 | 01:26 PM

#18

ppat

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Posts: n/a

thanks for the help...it cleared a few things up i guess.

Sep 16, 2004 | 03:03 PM

#19