Is going from 195 60R 15 to 195 55R 15? - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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Old 03-11-2009, 10:21 PM   #1
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Is going from 195 60R 15 to 195 55R 15 a bad idea?

Hi I need to buy new summer tires. I really want General Tires.

I would preffer to get General Exclaim UHP tires in 195 55R 15

The General Altimax HP tires are available in the stock 195 60R 15.


Is going down to 55R so bad?!!

Both are exellent choices but by law I must have winter tires during the winter so I'd like a proper set of true summer tires.

As much as I love the Eagle RS-A tires, their too expensive at $155/ea + 12.88% tax and tire recycle fees.

Thanks for the help in advance!


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Old 03-11-2009, 10:40 PM   #2
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The 195/55-15's will only be *slightly* shorter than factory size, and won't hurt anything to put on the car. Your speedometer might read one or two kph faster than you're actually going, but honesty I'd bet it will be so close you won't even tell.
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Old 03-11-2009, 10:48 PM   #3
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That's what I was thinking! What if the tire shop starts to talk me out of it?!
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Old 03-11-2009, 11:29 PM   #4
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I don't know why they would.
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Old 03-12-2009, 11:31 AM   #5
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Quote:
Originally Posted by surgeo1919 View Post
That's what I was thinking! What if the tire shop starts to talk me out of it?!

The only valid reason they may have is if the 55's don't have the same load carrying capacity as the 60's. If that's the case they'll sell you the tires but will probably refuse to install them. Its a liability issue.
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Old 03-12-2009, 03:11 PM   #6
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The only valid reason they may have is if the 55's don't have the same load carrying capacity as the 60's. If that's the case they'll sell you the tires but will probably refuse to install them. Its a liability issue.
Thanks for the info!

I have two places that sell that model of tire. I'll see what the say!!

I have my studded General Altimax Artics on steel rims so worse case I can have them install the summer tires on my mags and I'll take care of the rest.
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Old 03-12-2009, 03:38 PM   #7
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The only valid reason they may have is if the 55's don't have the same load carrying capacity as the 60's. If that's the case they'll sell you the tires but will probably refuse to install them. Its a liability issue.

Which *should* only apply IF the combined load carrying capacity of the tires is lower than the GVWR of the car, as posted on the sticker. Right? I mean if you can load the car to it's limit, and still be under the capacity of the new tires (if they are rated lower) you should still be OK.
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Old 03-12-2009, 04:20 PM   #8
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Which *should* only apply IF the combined load carrying capacity of the tires is lower than the GVWR of the car, as posted on the sticker. Right? I mean if you can load the car to it's limit, and still be under the capacity of the new tires (if they are rated lower) you should still be OK.

Theoretically, yes. But unfortunately it can be a little more complicated.

A typical 195/60-15 has a load rating of 88 or so which is equal to a maximum load of 1235 lbs per tire. A 195/55-15 tire has a rating of 85 or 1135 lbs per tire.

If it was as simple as taking the gross vehicle weight and dividing by four then your theory is correct. But to complicate it you must also take in the laws of physics. When a car goes over a bump and comes down the GVW increases significantly (physics). The enginerds take that into consideration as well as a fudge factor knowing some person may put four burly friends in the car with him and play wannabe rally driver or just overload the car and exceed the GVW. Naturally they can't accommodate all contingencies (stupidities as I call them) but they do allow for a reasonable fudge factor.

So if the enginerds spec a minimum load rating of 88 or whatever for a particular car, selecting a tire with anything less raises a red flag to a good/informed tire retailer. Yes an 85 load rating may be perfectly fine for most everyday driving but the enginerds spec for the worst case scenario.
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Old 03-12-2009, 04:33 PM   #9
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As for the load, I don't forsee any problems. 90% of the time I'm alone in the car. Only once in a bluemoon occasions will i have 4 adults in the car.

I know the tire shop doesn't care about my life story and what I don't see being a problem but I don't think I'll be refused!
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Old 04-20-2009, 11:19 PM   #10
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I finally bought the Exclaim UHP tires in 195 55 15 and I love them! They are so quiet and grip really well and it makes the focus look even better!

Most importantly, I don't see any difference in performance other than some nice road handling compared to my horrendous yoko avid trz tires.
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