2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

what offset do i need?

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Old Sep 17, 2002 | 02:02 PM
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neonsport223's Avatar
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From: altanta, ga
what offset do i need?

Ok, i'm going to get 17x7 wheels and i want to run 4 225x45(or 40)x17 tires , between what offsets do i need to be looking for? Thanks in advance.

p.s. did the search
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Old Sep 17, 2002 | 02:42 PM
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From: Mississauga
stock is 38 mm
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Old Sep 17, 2002 | 02:42 PM
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From: Naperville, IL.
i asked mazdatrix about running 225's up font. this is what they said:

"I have 225 x 50 x 16's on the front of my '86 (245's on rear). I needed somewhere around 1/8" to 3/16" spacers. Being incredibly lazy, I just put some big washers over the studs."

Dave --

a 17" wheel shouldent make a difference.
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Old Sep 17, 2002 | 07:32 PM
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could just using cheapy washers instead of actual spacers do anything to the balance of the wheel? they do spin a helluva lot. i dunno if it would make a difference, im just sayin maybe..
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Old Sep 17, 2002 | 07:46 PM
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From: Rohnert Park CA
Originally posted by Cheers!
stock is 38 mm
No, Stock on all FC models is 40 MM or ET

You would need a 30 to 35 MM or ET offset to fit a 17x7 with a 225.

*edit
BTW: a 225/45-17 will be closer to the stock size and speedo than the 225/40. The 225/45 will only be off by a touch more than 10th of an inch (diameter). However the the 225/40 will be off almost 1 inch in diameter, resulting in a speedo error of around 3.2 % (too fast).

Last edited by Icemark; Sep 17, 2002 at 07:52 PM.
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Old Sep 17, 2002 | 08:20 PM
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From: Mississauga
damn... never mind... i stand corrected.... i don't know what i was thinking
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Old Sep 20, 2002 | 11:55 AM
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From: altanta, ga
So if i wanted to go with 235s all around would i need a 17x7.5 with spacers up front or should that also fit with a 30 or 35 offset. Also, what does the offset affect, just how the wheels will fit or will it affect the turning, or any other performance aspects? and if i have spacers up front but none in the back will the front wheels stick out from the fender and look stupid. what size spacer would i need up front? Thanks.
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Old Sep 21, 2002 | 01:34 AM
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From: n
235's are really too tight in the fronts.&nbsp The offset has to be PERFECT and the fender lip needs to be rolled.&nbsp It would also help to run some camber plates to run a little negative camber up front to tuck the tire in...


-Ted
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