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1998 S 6MT!
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276 Posts
Discussion Starter · #1 ·
hello all,

i have a couple of questions regarding tire size for the SF forester...
i have a wagon take off suspension from an '04 WRX and with my snow tires (pictured below, 225/60/16 on stock wheels) it looks pretty good, a little gap in the front but definitely manageable.

so yesterday i finally got my new 17's mounted up with 225 /45/17's and it looks goofy, big wheel gap now.

my question is, are 225/55/17's going to fit and not cause any rubbing issues? would they be a good route to go and fill up that wheel gap a little bit? i really like my suspension the way it is and don't want to go too much lower as i do tend to go down some gnarly roads.

i did the math in a tire calculator and they are almost identical in size to the 225/60/16's i have for snow tires. With the larger 55 sidewall than the 45's, would it tend to reduce performance while cornering or would it be negligible?

here are some pics for reference, thanks!

with snow tires at 225/60/R16:



with 225 / 45 / R17's:

 

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Registered
1999 Forester L 5Speed
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25 Posts
Yea the 225/45/17's are about 5% shorter then OEM sizing which is why your gap is so big. A 225/55/17 is slightly larger then OEM. The 225/55/17 is equivalent to your last set up at 225/60/17 so you'll get identical stance.
 

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Registered
1998 S 6MT!
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276 Posts
Discussion Starter · #4 ·
I run a 225/55-17 snow tire currently.

lowered:


stock suspension:
thanks for those pictures. being snow tires, i know they are pretty squishy, does the increase in sidewall (45 to 55) make the tire a lot more plyable or is that going to depend a lot on the specific tire?

Yea the 225/45/17's are about 5% shorter then OEM sizing which is why your gap is so big. A 225/55/17 is slightly larger then OEM. The 225/55/17 is equivalent to your last set up at 225/60/17 so you'll get identical stance.
yeah i'm hoping that will not rub but i'm guessing that this will have something to do with the rim offset as well...

if a tire is Z rated, is the rubber substantially harder (higher durometer?) than say a T rating or W/V rating?

...just trying to figure out tire tech lol
 

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1999 Forester L 5Speed
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25 Posts
A higher speed rated tire has more support basically. The rubber or compound is not what is changed but the actual structure of the tire and steel belts it's composed of and the amount it is composed of is what changes.

To find out if it will rub or not, what is the width and offsets of your new wheels?
 

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1998 Forester L Automatic
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9 Posts
Was anything figured out with this? I am also lowered on 04 WRX wagon suspension. I just got a set of 17x8 et35 wheels yesterday, and the 225/45s that are currently on them leave way more gap than I want. My last setup was 205/75 on 15x8 et12 wheels and they rubbed when I hit bumps or took turns at higher speeds. I am trying to decide between 225/55 and 215/55. I would prefer to go with the 225/55 as they are a little lower in cost, and I would like as little gap as possible (without rubbing).
 

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2004 Forester automatic
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62 Posts
2004 FXT on WRX suspension

215/45/17



225/55/17 Little bit of rub in the back over bumps at speed.




Ideally I'd go with 225/40/18, but I don't have the money for it right now.
 

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Administrator
2004 Forester XT Premium 4EAT
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29,432 Posts
Was anything figured out with this? I am also lowered on 04 WRX wagon suspension. I just got a set of 17x8 et35 wheels yesterday, and the 225/45s that are currently on them leave way more gap than I want. My last setup was 205/75 on 15x8 et12 wheels and they rubbed when I hit bumps or took turns at higher speeds. I am trying to decide between 225/55 and 215/55. I would prefer to go with the 225/55 as they are a little lower in cost, and I would like as little gap as possible (without rubbing).
Go with the 215/55 or even 215/50 if you want to avoid rubbing. We're running 225/50/17 on our '98 and it rubs the inner liner at full lock in the front, and the wheel well rubs the outer sidewall in the rear under hard cornering. Slynki is on WRX struts with Koni inserts.

 

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Premium Member
2017 VW Golf SportWagen 5MT
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10,784 Posts
8" wheel though.. 215 may be a bit on the narrow side.

Stan
 

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2002 S-turbo Manual 5sp
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72 Posts
225/50/17 on STI wheels (17x7.5 ET53) and STI wagon suspension, I had some 3mm on the rear between the tyre and the strut, had to take it off as I couldn't pass the inspection, to little space (minimum is 5mm)..Front were good, on compressed suspension and full left and right lock, there was at least 8mm between the tyre and chassis....225/45/17 that I had before were great as tyre didn't "bulge" that much, but speedo was to much off, again for inspection, so I went with 215/50/17....
I guess, with wheels that have minimum Forester's ET48 you should be fine...
I found this link very useful to get rough numbers - Custom rims, wheel tire packages for your ride - RIMSnTIRES.com
 
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