Tire size options
- Thread starter sxg6
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Stock Tire - 185/65R15 >Search Tires Tire 1 - 195/60R15 >Search Tires
Section Width: 7.28 in 185 mm
Section Width: 7.67 in 195 mm
Rim Diameter: 15 in 381 mm
Rim Diameter: 15 in 381 mm
Rim Width Range: 5 - 6.5 in
Rim Width Range: 4.5 - 7.5 in
Overall Diameter: 24.46 in 621.28 mm
Overall Diameter: 24.21 in 614.93 mm
Sidewall Height: 4.73 in 120.14 mm
Sidewall Height: 4.60 in 116.84 mm
Radius: 12.23 in 310.64 mm
Radius: 12.10 in 307.34 mm
Circumference: 76.84 in 1951.7 mm
Circumference: 76.05 in 1931.6 mm
Revs per Mile: 850.3
Revs per Mile: 859.1
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.6 mph 101. km/h
Speedometer Difference: - Speedometer Difference: 1.034% too fast
Diameter Difference: - Diameter Difference: 1.03%
Section Width: 7.28 in 185 mm
Section Width: 7.67 in 195 mm
Rim Diameter: 15 in 381 mm
Rim Diameter: 15 in 381 mm
Rim Width Range: 5 - 6.5 in
Rim Width Range: 4.5 - 7.5 in
Overall Diameter: 24.46 in 621.28 mm
Overall Diameter: 24.21 in 614.93 mm
Sidewall Height: 4.73 in 120.14 mm
Sidewall Height: 4.60 in 116.84 mm
Radius: 12.23 in 310.64 mm
Radius: 12.10 in 307.34 mm
Circumference: 76.84 in 1951.7 mm
Circumference: 76.05 in 1931.6 mm
Revs per Mile: 850.3
Revs per Mile: 859.1
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.6 mph 101. km/h
Speedometer Difference: - Speedometer Difference: 1.034% too fast
Diameter Difference: - Diameter Difference: 1.03%
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- Sep 28, 2002
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Section width: 7.4/7.9
If this was more radical, as in something like a LT tire, you could run into rubbing at the turning stops. This naturally assumes that you're using the same rims with the same backspacing and offset.
If this was more radical, as in something like a LT tire, you could run into rubbing at the turning stops. This naturally assumes that you're using the same rims with the same backspacing and offset.
1% taller is perfect. If you car has any heft to it, the beefier tires will be a BIG plus. Take the example of Passat v A4. Identical cars, the Passat comes with 195/65-15, the A4 with 205/60-15. Auto mfgs are seeking mpg with smaller tires. In the real world, the bigger (but not oversize) tires are way better. Anything above a 60 profile is not really going to offer the best performance. Trust me. You will be very happy you made the step-up. Just put the 2 tires side-by-side atthe tire shop. Trust.
FWIW, you can use 195-60-15 or 205-60-15 (as was said) w/out any real difference in speedo readings. You may have better tire options when you 0+ size too.
Whoa. Don't go overboard with the precision. The section width of a 185/65-15 tire is 185 +/- 5mm, and the aspect ratio of a 185/65-15 tire is 65 +/- 2.5, with both of those measurements valid only when the tire is mounted on a rim exactly the same width as the "measuring rim."
All tire sizes are specified in section widths ending in -5, so a tire with an "actual" section width of 180.1mm is a "185" tire, as is one with an "actual" section width of 189.9mm.
Similarly, the aspect ratio (distance from rim to outer circumference of unloaded tire, divided by section width) is specified in multiples of 5, so the granularity is +/- 2.5: a tire with an "actual" ratio of 62.6 is a 65-series tire, as is one with an "actual" ratio of 67.4.
So a "185/65" tire could be a 180.1/62.6 tire, with a sidewall height of 112.74mm or it just as easily could be a 189.9/67.4 tire with a sidewall height of 128.00mm.
Moreover, apart from the granularity indicated above, if a tire is mounted on a rim one inch (25.4mm) narrower or wider than the manufacturer's specified measuring rim, the section width will be decreased or increased by about 10mm, respectively.
So take those handy tire size calculators (or your desktop calculator's readouts) with a grain of salt.
I would be interested in knowing a site with a size calculator which actually allows rim width / diameter input so you will get a "real" idea of the differences when trying to 0+. Anyone know of any (Discount Tire does not)?
There is no such site, because such a calculation is impossible.
The problem is, the belts of most radial tires are somewhat dimensionally stable. In fact, the belts (as opposed to the carcass plies) on most radial tires are laid down on the bias, so the warp and woof of the belt fabric can be distorted from rectangular shape to diamond-shaped parallelograms, and thus elongate (or shorten) the circumferential belt length slightly with changes in rim width. But the amount of stretching or compression is unpredictable. The site that will give you the most information about +0 sizing is here . (This is a very long "page" and you will have to scroll down a long way to "Aspect Ratio and Rim / Pan Width."
I replaced the 185/65 tires on my daughter's Honda with 195/60 without problem. 65 series tires are lame, go for the 60s.
Ding. I actually do run 65s sometimes, for winters.
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