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#3389853 - 06/05/14 02:57 PM Larger tire size
outoforder Offline


Registered: 06/07/09
Posts: 358
Loc: Ohio
Only tire size available for my 08 Focus is a 50R. The tire I want only goes as low as 55R. What would happen if I put on these tires instead of OEM?
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#3389854 - 06/05/14 02:59 PM Re: Larger tire size [Re: outoforder]
Quattro Pete Offline


Registered: 10/30/02
Posts: 26143
Loc: Michigan
What is 50R?

Can you provide complete nomenclature/tire size?
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#3389869 - 06/05/14 03:22 PM Re: Larger tire size [Re: outoforder]
Quattro Pete Offline


Registered: 10/30/02
Posts: 26143
Loc: Michigan
If it's 205/50/16, then you could potentially run 195/55/16 instead. Load index is the same, and the overall diameter would be less than 2% different from stock.
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#3389873 - 06/05/14 03:25 PM Re: Larger tire size [Re: outoforder]
copcarguy Offline


Registered: 12/06/12
Posts: 50
Loc: PA
As stated above, you'll need the entire tire size... There is a great tire size calculator here:

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

You can compare your current size to another, and it'll tell you how much it'll throw off your speedometer, revolutions per mile, etc...

HTH

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#3389992 - 06/05/14 05:19 PM Re: Larger tire size [Re: outoforder]
outoforder Offline


Registered: 06/07/09
Posts: 358
Loc: Ohio
OEM tire is 205/50R-16. The tire I want doesn't come that small. Nearest size is 205/55R-16.
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#3389999 - 06/05/14 05:33 PM Re: Larger tire size [Re: outoforder]
HTSS_TR Offline


Registered: 04/17/06
Posts: 12961
Loc: Irvine, CA
OEM size diameter is 24.1", 205/55-16 is 24.9" about 3.4% larger than OEM.

Is it okay with your car, hard to tell.

I tried 245/45-17 instead of OEM 235/45-17 on my E430 10-11 years ago, the ABS malfunction within 100 miles such that I had to go back to OEM size, and the ABS malfunction light went off within a mile of driving.
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#3390003 - 06/05/14 05:36 PM Re: Larger tire size [Re: outoforder]
outoforder Offline


Registered: 06/07/09
Posts: 358
Loc: Ohio
Car is a 2008 Ford Focus. Apologies for not including all information in earlier posts. The tire guy at Sears appears knowledgeable and has no qualms about this. However, it is Sears…… :-/

Tires are currently being installed. We will know soon. I have 30 days to like them so if anything goes wrong, I can take them back.
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#3390406 - 06/06/14 07:03 AM Re: Larger tire size [Re: outoforder]
CapriRacer Offline


Registered: 02/22/03
Posts: 2575
Loc: Somewhere in the US
According to Discount tire, a 215/50R16 will fit, but they don't list the 205/55R16. That's probably because it's over 3% different in diameter. They don't like recommending anything more than that.
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#3390428 - 06/06/14 07:37 AM Re: Larger tire size [Re: outoforder]
outoforder Offline


Registered: 06/07/09
Posts: 358
Loc: Ohio
I got 205/55R-16 Hankook Road Handlers on the car. Drove 20 miles home with no issue. The vibration from previous tires is gone. I realize this is a statistically insignificant distance, but so far, so good.
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#3400292 - 06/18/14 03:04 AM Re: Larger tire size [Re: outoforder]
Darris Offline


Registered: 08/12/06
Posts: 74
Loc: Toronto, ON. Canada
Originally Posted By: outoforder
I got 205/55R-16 Hankook Road Handlers on the car. Drove 20 miles home with no issue. The vibration from previous tires is gone. I realize this is a statistically insignificant distance, but so far, so good.


Your spedometer and odometer will be slightly off due to the computer pre-supposing a few more wheel revs per mile. Might slightly effect metrics such as instant & average fuel economy.

I recently took possession of a vehicle with larger than stock diameter. It slows it down a little off the line, and accelerating within city speeds, but takes less gas to maintain highway speed. Car seems to have more momentum and takes a little more brake to bring it to a stop. I imagine it will wear the brake pads a bit sooner than stock diameter or smaller.


Edited by Darris (06/18/14 03:04 AM)
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#3400574 - 06/18/14 12:23 PM Re: Larger tire size [Re: outoforder]
Ken2 Offline


Registered: 12/02/02
Posts: 6258
Loc: Washington St.
Quote:
OEM tire is 205/50R-16

205 mm across the width of the tire body (approximate)
50% aspect ratio = width to height ratio, so the tire from bead to tread is about 52.5 mm high
R = radial
16 = wheel rim diameter in inches
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