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Old 01-27-2002, 11:05 PM   #1
Evan J. Kelly
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Default 225's on stock 2000 RS wheels?

Is it safe if I run Dunlop D-60 225's on my wheels?

I was told not to by some schmo at Discount Tire.

Thanks A Lot,
~Evan
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Old 01-28-2002, 12:22 AM   #2
Akiata
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ya its ok. I have 225 50 16 Kumho victoracers on my stock WRX wheels and they are 6.5", yours are 7" wide. It will make the diameter of the wheel bigger throwing off your speedometer a little though.

p@
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Old 01-28-2002, 01:34 AM   #3
Dolphin Overton
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The schmo at discount tire is right. This will not optimize handling. You I would go with 215/45 16 or if you care about wheel gap go 205/50 16 or even just stock size.
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Old 01-28-2002, 08:50 AM   #4
SubaruStu
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Quote:
Originally posted by Akiata
ya its ok. I have 225 50 16 Kumho victoracers on my stock WRX wheels and they are 6.5", yours are 7" wide. It will make the diameter of the wheel bigger throwing off your speedometer a little though.

p@

According to tire calculators, the 225/50/16 is as close an exact
match to 205/55/16 as you are going to get. The diameter is so
close that you will have negligible speedo error.

On one of the manufacturers site (I think it was Yokohama) they
list the rim size range for each tire, and the 16x7s were ok for
their 225/50/16 tire.

The only thing I would be concerned with is tire rub if your car is
lowered at all. I don't think it's an issue at the stock height. If it
is lowered, I would stick with stock or a 205/50/16 if you are
looking for shorter sidewall. It will be slightly smaller in
circumfrence, so your speedo will read a little high.


Stu
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Old 01-28-2002, 01:30 PM   #5
Ru fan
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I have heard that putting too wide of a tire on a rim that is too small will decrease your grip. For example, if you put a tire that is 8" on a rim that is only 6" wide, this will cause the tire to simply bulge your contact patch and reduce grip.

Later,
Seth E.
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Old 01-28-2002, 01:59 PM   #6
Evan J. Kelly
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Quote:
Originally posted by Ru fan
I have heard that putting too wide of a tire on a rim that is too small will decrease your grip. For example, if you put a tire that is 8" on a rim that is only 6" wide, this will cause the tire to simply bulge your contact patch and reduce grip.

Later,
Seth E.
I don't plan on doing that...
and I am at the stock ride height...
thanks everyone.
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Old 01-28-2002, 03:10 PM   #7
Dolphin Overton
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It's too wide... Ru Fan is right; it will not be as grippy as a 215/45 or a 205/50
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Old 02-08-2002, 04:16 PM   #8
RS ING
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Has anybody here actually put on the 225/50/16 tires on their 2000-2001 RS? I'm currently getting ready to shop for replacement tires for my Cobb RS which came with 215/50/16 and my speedo is off a little the tire calculator shows why. the 225/50/16 have the exact same dimensions. I just want to hear from somebody with a stock suspension if they rub or not. I'm betting that they will not but first hand experiance always rules.


http://www.miata.net/garage/tirecalc.html
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Old 02-08-2002, 04:40 PM   #9
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It depends on the tire and sectional width, but almost anything in a 225 _will_ rub on a 98-01 RS with a stock suspension... In fact I'm not aware of a tire that won't rub. I would also recommend not running a tire with a sectional width greater than 9.1" since it might not even clear the strut.

FWIW, I had 225/50 16s on my 16x7 MY98 rims and they were right at what I'd call the limit in terms of tire width for a 7" rim. I would _not_ feel safe putting a 225 wide tire on a 6.5" wide rim, but you could probably shoehorn it on there.
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Old 02-08-2002, 06:29 PM   #10
Evan J. Kelly
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Alright, but what if you ran 205/55's on front and 225/50's in the rear.

I know it would problably play games with the cars tendency to oversteer, but I was wondering if that type of a setup would cause damage to the diffs.

I understand that 205/55's and 225/50's are just about the same actual size, almost exact. I was thinking the differnces in size wouldn't be any more that of running different psi's between the front and rear.

Any "insight"

Thanks again,
~Evan
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Old 02-08-2002, 07:39 PM   #11
Darshu
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Actually, it's the rears that tend to rub (against the outside fender.) And yeah, the rotational diameter of the two tires is almost spot on the same. If you want to run 225s, this is what I would suggest (it's more or less what I've done)

1) Get a height adjustable suspension with stiffer springs. This will reduce body roll/suspension travel and help keep the rears from rubbing.

2) Be sure to use a rim at least 7" wide. You'll notice that the rim width tire manufacturers recommend for a 225 wide tire is between 7-8"

3) Make sure the particular tire you use doesn't have a sectional width greater than 9.1" tire widths and shapes vary greatly from manufacturer to manufacturer. You'll really notice this if you stack 4 225 wide Hoosiers up against 4 225 wide pirellis, for example.

4) Be prepared to possibly roll your fenders and adjust rear camber to help the tires keep from rubbing at the limits.


If you're not willing to work to fit 225s, just get some 205s or 215s. A tire that fits is better than one that doesn't
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Old 02-08-2002, 08:22 PM   #12
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Listen to what Darshu says.

I'll add that mounting a 225/50R16 on a 16x7 wheel is totally okay. That's the stock size of tires and rims that come with Mk III Toyota Supras (86.5-93), including the Turbo version. There is absolutely no problem with such a combination.

-Ray
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Old 02-09-2002, 02:52 AM   #13
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As others might have said - even at stock height, you will have more problem with your rears. Probably need a bit of negative camber along with stiffer strut/spring combo.
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Old 02-09-2002, 01:58 PM   #14
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i've run 2 sets of 225/50-16s on my '99RS and am about to order a third.

it's very possible you'll have rear fender clearance issues, but if you remove the trim and roll the fender lip (I haven't) you'll be alright most of the time.

stiffer suspension helps keep the tire off the fender quite a lot, do a search on my name if you wanna hear more about it.
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Old 02-10-2002, 01:34 AM   #15
fatVdub
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what brand tires are you guys with a GC8 running on the stock rim??? i just did a test fit today with the dunlop sp5000 in 225/50/16... they were in constant contact with the rear strut and it would not of even moved if i let the car off the jack... i have stock height suspention. as for other 225/50/16.... they rub... tell a good brand that dosest rub on the MY01's and earlier. on the REX with stock rims they are fine.
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Old 02-10-2002, 12:57 PM   #16
Patrick Olsen
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Quote:
Originally posted by Akiata
ya its ok. I have 225 50 16 Kumho victoracers on my stock WRX wheels and they are 6.5", yours are 7" wide.
I've even put 225/50-15 Kumho V700s (which are wider than normal 225 street tires) on 6" wide wheels for auto-x/open track usage. It sure as hell wasn't the optimum setup, and I only ran that way for a few months before investing in 15x7" wheels, but it worked.

Quote:
Originally posted by Akiata
It will make the diameter of the wheel bigger throwing off your speedometer a little though.
As has already been pointed out, a 225/50 and a 205/55 are the same diameter.

Quote:
Originally posted by Dolphin Overton
It's too wide... Ru Fan is right; it will not be as grippy as a 215/45 or a 205/50.
I've seen this debated before. Some say that it's best to have a tire that's as close as possible to the width of the wheel. That way, when you enter a corner, the outer sidewall is immediately put in tension, which is what actually "pulls" the car into the corner.

On the other hand, there are those who say contact patch size is king. Go to the SCCA Nationals and see how many people are running tires that are "too wide" for the wheels so they can stay in Stock class. People have found over the years that even though it might not match the tire manufacturer's recommendation, they get more grip in the corners with a wider tire, so they run that wider tire on their stock wheels.

Quote:
Originally posted by rkkwan
I'll add that mounting a 225/50R16 on a 16x7 wheel is totally okay. That's the stock size of tires and rims that come with Mk III Toyota Supras (86.5-93), including the Turbo version. There is absolutely no problem with such a combination.
My Mustang came with 225s on a 7" wide wheel. Ford used that combo (225/60s on 15x7s, then 225/55s on 16x7s) from '85-93.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 02-15-2002, 10:47 PM   #17
sleipnir
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Default Worked okay but some rubbing

I had RE730 225/50/16's on my '01 RS (stock suspension and wheels). If I really got on it in a turn, it would just barely rub the fender trim on the drivers side rear. Never got any rubbing on the passenger side or in the front. Stuck and handled way better than the RE92's (except I had to slow down a bit for right-handers).

Later on I got P1's and put on Dunlop 9000's in 215/45/17. No rubbing at all. 2 weeks later I totaled the car. :-(
P1s and DMS Golds are in the mail for the new WRX that replaced it (but damn I miss the coupe).
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