1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

15x8 + 20 up front w/ 225/45R15 Anyone ran this?

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Old Apr 4, 2010 | 11:43 AM
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15x8 + 20 up front w/ 225/45R15 Anyone ran this?

Does it fit

How tight
Did it rub?

What camber and what springs

How far does it poke past the fender.

And lastly post pics if you got em.

Thanks
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Old Apr 4, 2010 | 11:48 AM
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need a spacer to clear springs... my 15x7 +27? nearly rub and i have 205 50 15. you'll need flares or have to run it higher
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Old Apr 4, 2010 | 01:40 PM
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From: https://www2.mazda.com/en/100th/
but you have 12a brakes? different offset?

i wanna do this too, in the rear, no problem, in the front?
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Old Apr 4, 2010 | 07:07 PM
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15x7 +15 with 225/50 required monstrous fender rolling, the front edges of the fender lips had to be pushed out so much that the bottom of the fender was about a 45 degree angle to the car.



Tires baaaaaarely rubbed the springs sometimes.

You'd definitely have to roll as much - the problem isn't the diameter so much as it is the width.

Fortunately, the fenders are so thin that they are one-handable and probably weigh less than street-grade carbon fiber, which means you can roll the lips and then move the fender to where it needs to be just by pulling on it.
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Old Apr 4, 2010 | 11:45 PM
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From: https://www2.mazda.com/en/100th/
ive got 225/45/15's on 15x7 offset 7 wheels. my problem is actually the rear fender lips, its TIGHT. the front with some camber tucks, and has 1" or so to the strut....
Attached Thumbnails 15x8 + 20 up front   w/ 225/45R15      Anyone ran this?-img_0474.jpg   15x8 + 20 up front   w/ 225/45R15      Anyone ran this?-img_0475.jpg  
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Old Apr 5, 2010 | 01:06 AM
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sry forgot se is different from 12a
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Old Apr 5, 2010 | 07:22 PM
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im looking to run this same setup.. i was gonna do 205s in the front and 225s in the back. 15x7 and 15x8 +20 offset... ill roll the fenders if i have to. and im gonna try to run respeed coilovers so i can adjust them
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Old Apr 5, 2010 | 07:35 PM
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it'll be close but it will rub the springs... you'll have to use a 5mm or bigger spacer, but then you're going to have to roll and full the front fenders. 15x7 +7 with 205's clear the springs by about 1/2"
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Old Apr 7, 2010 | 08:38 AM
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Get RE-Speed coilovers in the front, they will give you more room than stock springs.
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Old Apr 7, 2010 | 11:50 AM
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The spring seat is the main rub point, not necessarily the spring.
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Old Apr 8, 2010 | 08:08 AM
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cuz most of the offsets i see with the 4x110 pattern are +20. if i change bolt patterns the adapter is 15 mm. so id need like a +35 offset or +30 to make it sit right in the fenderwell?
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Old Apr 8, 2010 | 08:41 AM
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I want to run the 15X8 +20 all around, but with 195/50/15's. Shouldn't have a problem.
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Old Apr 8, 2010 | 11:16 AM
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From: https://www2.mazda.com/en/100th/
Originally Posted by ricerockettuner
cuz most of the offsets i see with the 4x110 pattern are +20. if i change bolt patterns the adapter is 15 mm. so id need like a +35 offset or +30 to make it sit right in the fenderwell?
node and i are looking at the rota RB, its 4x110 -20, they are one of our sponsors, so we get a deal.

but yeah, if the offset is 20, the 15mm spacer makes it 5, which in a 15x7 will fit, but 15x8 will stick out

the 13x8's are cool looking too, but i'd have to buy tires cause the race car is 225/45/15
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Old Apr 8, 2010 | 04:54 PM
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Originally Posted by ricerockettuner
cuz most of the offsets i see with the 4x110 pattern are +20. if i change bolt patterns the adapter is 15 mm. so id need like a +35 offset or +30 to make it sit right in the fenderwell?
A 15mm spacer will bring the effective hub surface out to the same as GSL-SE, so use wheels for that suspension as a guide.

I really wish the aftermarket would use backspacing instead of offset. Stock 12A is 5.5" wheels with 25mm offset. This is almost the same backspacing as 7" wheels with zero offset. (Technically it'd be +6)

Offset tells you the hub face in relation to the centerline of the wheel, which is great if you're concerned with theory. Backspacing tells you how much room you have on the backside of the wheel, which is great if you're concerned with what will actually fit on the car...
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Old Apr 10, 2010 | 03:04 PM
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I have an -SE and want to run 16 x 8 +15 offset w/ 185/50/R16 tires on all for corners.

Would I have any big fitment issues?
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Old Apr 10, 2010 | 05:11 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by Rotaryfreak702
I have an -SE and want to run 16 x 8 +15 offset w/ 185/50/R16 tires on all for corners.

Would I have any big fitment issues?
Your new wheel will have the following chracteristics:
The clearance from strut housing to the inside of the wheel will be 7mm LESS
The outside edge of the wheel will EXTEND an extra 57mm
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Old Apr 10, 2010 | 11:29 PM
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You forgot:

You will look like a DOUCHE with 185-width tires on an 8" rim
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Old Apr 11, 2010 | 01:41 AM
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Originally Posted by peejay
You forgot:

You will look like a DOUCHE with 185-width tires on an 8" rim
I'm going for a stretched look lol.
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Old Apr 11, 2010 | 05:16 AM
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Hi guys, I'm mulling over fitments at the moment too so if anyone here could throw me a bone and give me an idea what this would fit/look like that'd be great.

So i"m looking at....

15x8 superlites

-4 ET

110mm backspace

I've got a 1983 series 2

I want to use 240z style arches so am trying to achieve wheels that stick out that far just to give you an idea.

Cheers fellas

Tim
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Old Apr 11, 2010 | 12:09 PM
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I've got 15x6.5 w/ 205/50's. I can't remember the offset, but they didn't rub.
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Old Apr 11, 2010 | 01:29 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by captainbizzaro
Hi guys, I'm mulling over fitments at the moment too so if anyone here could throw me a bone and give me an idea what this would fit/look like that'd be great.

So i"m looking at....

15x8 superlites

-4 ET

110mm backspace

I've got a 1983 series 2

I want to use 240z style arches so am trying to achieve wheels that stick out that far just to give you an idea.

Cheers fellas

Tim
which brakes do you have? the 4x110 pattern or the 4x114.3 pattern? the offests are different.
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Old Apr 11, 2010 | 01:57 PM
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Originally Posted by j9fd3s
which brakes do you have? the 4x110 pattern or the 4x114.3 pattern? the offests are different.
Oh right yeah sorry about that I'm running 4x110 completely standard setup.
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Old Apr 11, 2010 | 02:37 PM
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From: https://www2.mazda.com/en/100th/
Originally Posted by captainbizzaro
Oh right yeah sorry about that I'm running 4x110 completely standard setup.
Your new wheel will have the following chracteristics:

The clearance from stut housing to the inside of the wheel will be 8mm LESS
The outside edge of the wheel will EXTEND an extra 56mm

http://marksink.com/tire_wheel_offset/offset.html

should be just about right?
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Old Apr 11, 2010 | 02:47 PM
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Originally Posted by j9fd3s
Your new wheel will have the following chracteristics:

The clearance from stut housing to the inside of the wheel will be 8mm LESS
The outside edge of the wheel will EXTEND an extra 56mm

http://marksink.com/tire_wheel_offset/offset.html

should be just about right?
Thank you kind sir that is great, really appreciate it.

Hijack over, apologies to OP.
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Old Apr 14, 2010 | 06:30 AM
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Need photos of the hellaflush offsets people... Keen to also run the rota rb in 15x7 +4 and 15x8 +4 also keen to know about the 16x7/8 +4 mmm
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