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Discussion Starter #1 (Edited)
Right now I am rocking the stock 17" wheels with 205 tires...

I have a NON mazdaspeed3 hatchback, I know the wheelbase is different, hence why I am asking for advice here.

Does anyone know how big I can go WITHOUT adding spacers or messing with my suspension/fenders??

I was planning on picking up some ASA AR1/AR2 in 18x7.5"

but I don't know what kind of tires I can go with so I don't have any rubbing or spacing issues.

I was planning on 225/40/18...


If I go with 225 tires will I need spacers?

Will 215 tires be too skinny to protect the outer lip of my rim?

Also, is that the same wheel diameter as 205/50/17 ? I don't want to have to mess with my odo/tach and larger wheels.


I did some quick reads and searches but never came up with any conclusive information on the NON mazdaspeed and 18" wheels/225 tires.

I want to avoid spacers if I can, and I don't want to tuck my fenders or anything like that.


I just want a lower tire profile to fit with my 18" wheels...


Still torn between the AR1 and AR2.

Initially wanted some BBS, but I can't constitute spending $3000 more...

AR2


ASA AR2 V2 Machined w/Anthracite Accent

AR1


ASA AR1 Silver w/Machined Lip



Links are broken, here is a pic.
 

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Peanutbutter Jelly!!!
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I had a 2008 Mazda 3 sedan and I picked up some CX-7 18x7.5 wheels which have the same bolt pattern and offset as the standard mazda 3 wheels. I put 225/45R18 on them and had no issues with rubbing even with aggressive cornering.

If I had known that the offset, bolt pattern was the same, I would have had the dealership swap out the 17" on the 2010 I bought onto the 08 and put the 18s on the 2010. I have the hatchback now btw. I put 225/45R17 on the stock 17" 2010 rims with no rubbing or any issues either.

I don't know if any of this helps but you should be fine with 225/45R18 on the hatch as long as you get close to the stock offset.
 

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The stock MazdaSpeed3 setup is 18x7.5 with 225/40's you can effectively run that on ony Mazda3 model and not need to modify it at all (as long as the offset is not too far from stock, which is +52).

Furthermore, you can run up to a 19x8.5 wheel (with a high offset) without any rubbing issues provided that you haven't lowered the vehicle yet...CorkSport runs this setup on their project car.

Once you start getting into lower offsets (anything lower than +40 or so) and lowering the vehicle is when fitment will start getting trickier.

THIS SITE might be of further assistance as well.
 

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Discussion Starter #4 (Edited)
I had a 2008 Mazda 3 sedan and I picked up some CX-7 18x7.5 wheels which have the same bolt pattern and offset as the standard mazda 3 wheels. I put 225/45R18 on them and had no issues with rubbing even with aggressive cornering.

If I had known that the offset, bolt pattern was the same, I would have had the dealership swap out the 17" on the 2010 I bought onto the 08 and put the 18s on the 2010. I have the hatchback now btw. I put 225/45R17 on the stock 17" 2010 rims with no rubbing or any issues either.

I don't know if any of this helps but you should be fine with 225/45R18 on the hatch as long as you get close to the stock offset.
Wait 225/45/18??

My wheels right now are 205/50/17

I was planning on doing 225/40/18...

Do I need 45/18 or 40/18??

I know the ms3 is repping 40/18 tires...


Spec sheet says:

mz3: P205/50R17
ms3:225/40R18



When I look at what tire rack recommends they say to do 45R/18

Is that even right?


I just want my shit to be the same diameter, but be fatter with a lower profile...


http://www.mazdausa.com/MusaWeb/pdf/specs_features/veh_specs_MS3_2010.pdf
http://images.mazdausa.com/MusaWeb/flash/vehicles/garage/2010/mz3/launchsite/images/specs/2010Mazda35DoorSpecs.pdf
 

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Discussion Starter #5
The stock MazdaSpeed3 setup is 18x7.5 with 225/40's you can effectively run that on ony Mazda3 model and not need to modify it at all (as long as the offset is not too far from stock, which is +52).

Furthermore, you can run up to a 19x8.5 wheel (with a high offset) without any rubbing issues provided that you haven't lowered the vehicle yet...CorkSport runs this setup on their project car.

Once you start getting into lower offsets (anything lower than +40 or so) and lowering the vehicle is when fitment will start getting trickier.

THIS SITE might be of further assistance as well.
Alright thanks for the info man.
 

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45's will make your setup 3.3% larger whereas 40's will make it 0.2% smaller. The 40's would be a lot closer to the stock setup diameter.
 

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Discussion Starter #7
45's will make your setup 3.3% larger whereas 40's will make it 0.2% smaller. The 40's would be a lot closer to the stock setup diameter.
Alright thanks

That's what I was looking for, shouldn't have to worry about odo/tach being off with .2% difference. :shuriken:
 

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Here's a cool setup for a MZ3. 18x8.5 +45. He went with 215/45 instead of 225/40. 215's lessen the poke in the front and closes up the wheel gap a bit. Ride quality is probably good. Only drawback is that his speedo is off 2.1% and performance is diminished slightly. Anthing less than 3% is ok to do. For every 1000 miles you drive it subtracts 21 miles from the odometer.
Here's a link to a tire size calculator http://www.1010tires.com/TireSizeCalculator.asp and offset calculator http://www.1010tires.com/WheelOffsetCalculator.asp
 

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Specs are from the online calculator linked to in my previous post...when I compared a 17x7.5 205/50 setup with a 18x7.5 225/40 setup it spit out a difference of 3.3% (25.1mm vs 25.9mm diameter).
 

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Discussion Starter #10
Hey thanks for the charts and links to calculators, that setup looks pretty sick.

I would love to have my 275 tire status back but those are not even close to fitting without mods/spacers.



I decided on the AR2 18x7.5

Just ordered em, going to pick up tires from discount tire when they come in!

Tire Details - Discount Tire

I had a set of falken ziex 275/40/17 on my camaro, loved em.

I had some BFG T/A KDW 275/40/17 before those falkens and those did not hold up for shit.
 

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Specs are from the online calculator linked to in my previous post...when I compared a 17x7.5 205/50 setup with a 18x7.5 225/40 setup it spit out a difference of 3.3% (25.1mm vs 25.9mm diameter).
Mz3 stockers are 17x7". Not 7.5".
 

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OOPS! :blush 1:

But, according to the calculator, the % difference is the same regardless of the actual wheel width. It's the aspect ratio of the tire with respect to it's diameter that will determine the overall size of the setup.
 

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Discussion Starter #16
For sure man, will be taking pics with my DSLR.

I *really* wanted some of these BBS with the red center-cap to match my paint but $890 a wheel is pretty steep.

 

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Peanutbutter Jelly!!!
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Well, on the 2008 I went from 15" steel to the 18" with the 225/45R18 and my spedometer ended up being correct with radar
 

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Discussion Starter #18
Well, on the 2008 I went from 15" steel to the 18" with the 225/45R18 and my spedometer ended up being correct with radar
What speeds did you test it at?

3% is 1mph difference @ 33 MPH which would clock you at 34

Unless you had a digital speedo there is no way to gauge the accuracy even with a radar.

:detective:

2-3% is negligible but your tires are probably really close to rubbing if they are not rubbing already.
 
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