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Old 01-12-2004, 09:06 PM   #1
capt.sensible
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OMGHi2U 16" Wheel/Tire Size Question

Hello All,

OK -- I've searched for an answer to this issue, but haven't found anything conclusive.

I want to buy a set of SSR Comps in 16x7.5, offset 48 with Kumho MX tires. Tirerack's site recommends using a stock-sized tire (205/55/16) with the 7.5" wide SSR rims. But the stock WRX rims are 6.5" wide -- a full inch narrower than the SSR's. Since this confused me, I used the handy tire size calculator at:

http://www.miata.net/garage/tirecalc.html

and this suggested I could use a 225/50/16 tire instead of the stock 205/55/16 size without throwing my speedometer off. So my question is: does anyone have experience or suggestions with what size tire fits properly on a 16"x7.5" rim?

Also, I'm just a regular driver -- I'm doing a track day and hopefully an autox in the near future, but my skills do not justify using a less-than-optimal tire size. If the 225/50/16 size gives a small improvement over the stock size (that would be useful to serious weekend racers) but has fitment issues, I think I'll just stick with Tirerack's suggestion.

My other concerns are:

Rubbing with a 225-section tire on my slightly-lowered (20mm) WRX wagon with STI struts and pink STI lowering springs. I'm currently running 215/45/17 tires on 17" rims to avoid any potential fender rubbing on my wagon.

Abusing my wheel bearings (I've never had a problem with them, but I've read a number of threads about bearing issues stemming from improperly-sized rim/tire combinations).

Not knowing enough about tire sizing.

Thanks very much.

Paul
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Old 01-13-2004, 02:30 AM   #2
capt.sensible
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Please?
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Old 01-13-2004, 03:16 AM   #3
stiles_sm
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IMO you're going to be less likely to rub w/the 16x7et50 size. You'll give up just a hair of responsiveness (turn-in), but you'll gain some rim protection. 225s are fine on a 7" rim.
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Old 01-13-2004, 09:25 AM   #4
Luke@tirerack
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225/50-16's will work fine on your car and it is what I would recommend

wheel search link

tire search link
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Old 01-13-2004, 04:16 PM   #5
capt.sensible
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Luke,

Thank you for replying to my question. I'll be calling you on Thursday or Friday to order the 16x7.5" SSR Comps with either my old reliable Kumho MX's or Bridgestone S03's (have never tried the S03's but have read so many positive review that I might give them a try).

stiles_sm -- Thanks for your input. It looks like I'll be giving the 7.5" wide rims a try. If you're at all interested, I'll let you know if they have any rubbing issues on my very slightly lowered wagon with 225/50-16's. I sure hope not.
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Old 01-13-2004, 04:37 PM   #6
stiles_sm
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I'm very interested, keep me posted.
BTW, why the 7.5 instead of the 7?
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Old 01-13-2004, 05:05 PM   #7
capt.sensible
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Stiles,

Two "reasons":

Appearance: The SSR Comps aren't available in 16x7" with a silver finish, which is what I want. This doesn't make a whole lot of sense to me, since the Comps are available in 16x7" with an anthracite finish. I suppose this is a question for Tirerack.

Curiosity: I've only used the stock 16x6.5 (55 offset) wheels and the optional Subaru 17x7 (53 offset) wheels on my wagon. I want to see the positive and negative (hopefully more positive) effects of running a slightly wider wheel/tire combination. I'm definitely nervous that the SSR's will rub, but I haven't found anyone running my potential setup (WRX wagon, SPT struts, STI lowering springs) with either 16x7" or 16x7.5" wheels and 225-50-16 tires.

In the absence of any feedback from members running a similar or identical setup, I'll just have to see for myself. As a graduate student with little money to spend, I'm certainly not overjoyed to be my own guinea pig. Hopefully my potential 16x7.5" 48 offset/225-50-16" setup will not turn out to be an expensive failed experiment.

Luke has read a description of my suspension setup, and if he says the 16x7.5"/225-50-16 combination will work, I'm going to trust him. Of course, it'd be easier to part with my money if another board member had feedback on this specific setup, but what the hell . . .
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Old 01-13-2004, 05:50 PM   #8
stiles_sm
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You can use the reams of data regarding rubbing with 17x7.5et48 setups with 225/45 tires, as the dimensions are nearly identical. The shape of the tire will be a little different, but it's definitely close enough to use for comparison.

Quite a few people are rubbing with this setup, with a lowered wagon, and some have no problem. Seems 215mm width solves the majority of the problems, but that probably isn't an option in 16.
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Old 01-14-2004, 03:12 PM   #9
capt.sensible
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Default The Man Makes a Good Point

Duh.

Stiles -- I am a dummy. I've been reading about rubbing problems with 17x7.5 offset 48 Rotas forever, but did not understand that these would translate into identical problems for 225-section 16-inch tires. I assumed the tire shape would be substantially different between 16" 225/50-16's and 17" 225/45-17's. Thanks for clearing that up.

I'm going with stock-sized 205/55-16's on my SSR's. The only issue left to discuss with Tirerack is whether or not it's OK to mount a stock-sized tire on a 7.5"wide rim. I've checked several tire manufacturer's sites, and they all list 7.5" as the maximum acceptable rim width for a 205/55-16 -- not optimal to me, but as long as it works I'll be happy.

Thanks again.
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Old 01-19-2004, 09:49 PM   #10
mtb_dude
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I've actually thought of running 225/50/16 on the stock wheels. The offset being very high (+55) might actually help the situation. Plus it will make the actual width of the tire a little narrower with the 6.5" wheel width.

My rough calcs show that the wagon rear fender has 2.70 inches of clearance from the point the wheel is mounted, to the inside fender lip.

With 225/50/16 on a 6.5" width and 55 mm offset the tire protrudes 2.42" out from the mounting plane. So i think the outside clearance is good, I just wonder about rubbing the strut. I'm pretty sure I'm going with 225/50/16 ContiExtremes. Anyone have a bad experience with these?
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Old 01-19-2004, 11:23 PM   #11
BIGSKYWRX
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A 7.5" rim seems quite a waste on 205 tire. Personally I think the 225/50 would work w/ your mild (20mm) lowering. I don't think you'll have any inboard issues w/ a 48mm offset, possibly mild outboard problems. Most have problems in the rear if they have any, sometimes just removing the plastic strip is enough.

One other possibility to consider is the 215/55/16- it's .4" over oe height. Many are running the 235/45/17 which is the same height w/ no complaints.

The SSR is a wonderful rim, as is the S03 tire- hope you get it worked out.

Big Sky
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Old 01-17-2005, 01:11 AM   #12
whtlegacy
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Did any verdict ever come of this?
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Old 01-17-2005, 08:49 AM   #13
Luke@tirerack
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yeah .... it works but, you need to be careful in the tire selection ... I know of 1 wagon that had rubbing issues with S03's but Eagle F1 GS-D3's fit with no issue
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Old 01-17-2005, 09:27 AM   #14
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Luke is the fender roller still like a six month wait? Any chance of adding a couple of new "machines"?
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