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Old 02-12-2007, 08:01 PM   #1
kbg1
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2008 Astra XE
2003 ION-2 Sedan
Question ION2 Tire Questions(2005)

hi
we have a 2005 ion 2 with about 50000kms(30000mi)on it.
it has the original 195/60/15 tires on it that we have hated from day one.
these things always look like they are half flat and the wet traction leaves a lot to be desired. also even when new the tread did not seem real good.
anyway i had the car to saturn last week for an oil change and the service writer said that the tires will need replacement within the next couple months.
they have been rotated every second or third oil change,but are beginning to show their age.

what i really hate about the tires is that they look so small in the wheel wells.
i was thinking of getting the following size tires to replace the oem's

205/65/15
i think these are narrower,and taller.
am i correct in this assumption?
i don't think that the 60 vs 65 width should matter,but i am wondering if the 195 vs 205 height will create any problems? i am not concerned with the speedo being out a bit either.
also they are on the steel rims and not alloy's
has anyone replaced the stock 195/60/15's with 205/65/15?
any clearance issues with the taller tires?

thanks in advance as always
jeff
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Old 02-12-2007, 08:28 PM   #2
migs1974
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2003 ION-2 Sedan
Default Re: ION2 Tire Questions(2005)

i always thought the first number in the tire size (195/60/15) was the width of the tire and the second number is the thickness of the sidewall. in the case of the stock tire, the tire is 195cm (or mm?) wide and the second number (65) represents the percentage of the sidewall in relation to the width. so the sidewall is 65% the width of the tire itself. someone told me that years ago but i could be way off. i dont know much about stuff.
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Old 02-12-2007, 09:19 PM   #3
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Default Re: ION2 Tire Questions(2005)

What tire fits...............?

Open the link


http://www.miata.net/garage/tirecalc.html
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Old 02-12-2007, 09:23 PM   #4
migs1974
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Default Re: ION2 Tire Questions(2005)

here ya go kbg1. Taken from a Tire Size Explanation site:

Section Width
Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's "Section Width" (cross section) in millimeters.

Example tire size - P225/50R16 91S

The 225 indicates this tire is 225 millimeters across from the widest point of its outer sidewall to the widest point of its inner sidewall when mounted and measured on a specified width wheel. This measurement is also referred to as the tire's section width. Because many people think of measurements in inches, the 225mm can be converted to inches by dividing the section width in millimeters by 25.4 (the number of millimeters per inch).

225mm / 25.4 = 8.86"


Sidewall Aspect Ratio
Typically following the three digits identifying the tire's Section Width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.

P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.

*So the tires you're thinking of getting are actually wider than you current ones.*

But i dont have the answer to the rest of your question as i have never changed the tires or wheels on my Ion.
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Old 02-13-2007, 10:03 AM   #5
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Post Re: ION2 Tire Questions(2005)

The unfortunate part about keeping the factory wheels is the fact that they are rather narrow. At most they are 6" wide, but may be closer to 5.5." This is going to be your limiter.

You first need to figure out what you want to do, keep your speedometer accurate or fill the wheelwell gap. If you buy tires that have overall larger diameter, then your speedo will say you are going slower than actual speed, i.e. speedo = 60, actual = 62 ...just an example)

To keep a similar diameter overall, an easy and quick way to find tire sizes, is if you want to widen the tires, you need to widen 2 sizes (20mm) and decrease the sidewall % 1 size (5%).

For you, your option from 195/60R15 to keep same diameter is 215/55R15, although I don't think this is a size that tire manufacturers actually make. 205/65R15 will definitely fill your wheelwell better, but

1. that is alot of sidewall
2. your speedo will read 60 when you are actually going 63mph


My opinion on wheels/tires for an ION. Personally, if you have the money to buy rims and tires, I would do it. I have 17" rims and 215/45R17 tires. It definitely looks much better than the factory 15's. This is not always reasonable money-wise, although there are very good deals from www.tirerack.com and Discount tire for wheel tire combos, and I know Tirerack will mount (on the rim) and balance tires for free.

If no new rims are in your future, I would look at 205/60R15 (speedo=60, actual=61.2).

Hope this helps...
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Old 02-15-2007, 09:41 PM   #6
kbg1
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Default Re: ION2 Tire Questions(2005)

hi again
thanks for all the info,makes for a great read.
still not sure what to do yet,but this certainly helps.
that little tire program really help with the visualizations.
as the car is leased i am not going to get new rims.
thanks,jeff
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