Automotive

Using P185 tires rather than my stock P195's??

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  • Oct 29th, 2009 9:17 pm
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Using P185 tires rather than my stock P195's??

Hi all,

Wondering if doing this is possible?

My old roommate left a couple winter tires when she left and now I'm wondering if I can put these on my car or not.

I believe they were from a MAzda 3 and I drive a 97 cavalier.

The rest of the stats match (P195 70R14 vs P185 70R14)

Will they fit on my rims? (steel rims)

Thanks
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I would use them if the treads better than you have on now , the only difference is 10 millimeters of tread width . And yes they will fit on your current rims.
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thumper80 wrote:
Oct 28th, 2009 10:05 am
I would use them if the treads better than you have on now , the only difference is 10 millimeters of tread width . And yes they will fit on your current rims.
These being smaller in diamater will cause my odo and speedo to be off by a bit right?

This would mean my speedo showing me going faster than what I'm actually doing right (I know it wont be by much...)
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TripleHelix wrote:
Oct 28th, 2009 10:09 am
These being smaller in diamater will cause my odo and speedo to be off by a bit right?

This would mean my speedo showing me going faster than what I'm actually doing right (I know it wont be by much...)
It won't affect it at all , if you were changing the height of the tire it would like from 195/70/r14 to a 195/75/r15 it would .
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Tire 1 - 185/70R14
Tire 2 - 195/70R14

Section Width: 7.28 in 185 mm
Section Width: 7.67 in 195 mm

Rim Diameter: 14 in 355.6 mm
Rim Diameter: 14 in 355.6 mm

Rim Width Range: 5 - 6.5 in
Rim Width Range: 5.5 - 7 in

Overall Diameter: 24.19 in 614.42 mm
Overall Diameter: 24.74 in 628.39 mm

Sidewall Height: 5.09 in 129.28 mm
Sidewall Height: 5.37 in 136.39 mm

Radius: 12.09 in 307.08 mm
Radius: 12.37 in 314.19 mm

Circumference: 75.99 in 1930.1 mm
Circumference: 77.72 in 1974.0 mm

Revs per Mile: 859.8
Revs per Mile: 840.7

It does affect it...
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TripleHelix wrote:
Oct 28th, 2009 10:25 am
Tire 1 - 185/70R14
Tire 2 - 195/70R14

Section Width: 7.28 in 185 mm
Section Width: 7.67 in 195 mm

Rim Diameter: 14 in 355.6 mm
Rim Diameter: 14 in 355.6 mm

Rim Width Range: 5 - 6.5 in
Rim Width Range: 5.5 - 7 in

Overall Diameter: 24.19 in 614.42 mm
Overall Diameter: 24.74 in 628.39 mm

Sidewall Height: 5.09 in 129.28 mm
Sidewall Height: 5.37 in 136.39 mm

Radius: 12.09 in 307.08 mm
Radius: 12.37 in 314.19 mm

Circumference: 75.99 in 1930.1 mm
Circumference: 77.72 in 1974.0 mm

Revs per Mile: 859.8
Revs per Mile: 840.7

It does affect it...
width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
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May 7, 2006
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Go for it
it won't make a huge difference in speed or quality of ride

most people go with smaller tires in the winter and wider tires in the summer
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thumper80 wrote:
Oct 28th, 2009 10:35 am
width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
thumper, please make sure you understand what the tire dimensions actually refer to. The height of the tire is always indicated as a percentage of the width.

so, for 195/70R14: height = 70% of 195mm
for 185/70R14: height = 70% of 185 mm.

That gives you a radius differential of 7.0mm, which is quite a lot.

If OP chooses a narrower tire, s/he should increase the aspect ratio. Going form 195/70R14 to 185/75R14 results in a negligible change in overall diameter.

To answer the OP's question correctly, I would recommend against using these tires -- not as much because of the size difference, but because you won't gain any advantages from doing so. If you do choose to mount them, they'd have to be mounted on the back (otherwise you're at high risk of fishtailing when braking on a slipper surface).
banban wrote:Go for it
it won't make a huge difference in speed or quality of ride

most people go with smaller tires in the winter and wider tires in the summer
Most people opt for narrower tires in the winter, not smaller ones (and they definitely don't opt for different tire sizes front/back). Overall tire diameter should remain the same.
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width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
Wow, missing something there aren't we?

the "70" in the 195/70 14" is the percentage of the height to the width of the tire, SSooooo 70% of 195mm is more than 70% of 185mm, grab your calculator and try it, it works :lol:

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D-3vil wrote:
Oct 28th, 2009 11:21 am
thumper, please make sure you understand what the tire dimensions actually refer to. The height of the tire is always indicated as a percentage of the width.

so, for 195/70R14: height = 70% of 195mm
for 185/70R14: height = 70% of 185 mm.

That gives you a radius differential of 7.0mm, which is quite a lot.

If OP chooses a narrower tire, s/he should increase the aspect ratio. Going form 195/70R14 to 185/75R14 results in a negligible change in overall diameter.

To answer the OP's question correctly, I would recommend against using these tires -- not as much because of the size difference, but because you won't gain any advantages from doing so. If you do choose to mount them, they'd have to be mounted on the back (otherwise you're at high risk of fishtailing when braking on a slipper surface).


Most people opt for narrower tires in the winter, not smaller ones (and they definitely don't opt for different tire sizes front/back). Overall tire diameter should remain the same.
All this has to do with me using tires I already have (Free) vs buying new ones. The car won't last me much longer (probably buying something else next summer or so), so this is only to keep me going until then.

This is a 97 Cavalier after all and wont be much more then scrap money once I do decide to get rid of it (which like I said is 1-1.5 years max).

And why would you put the smaller tires in the back?

I have 195s on my car currently...

The other thing is 7mm could easily (ok maybe not easily) be the difference in wear if replacing the tires at different times right? So is it really that big of an issue?

I haven't once replaced all 4 tires at once so I could easily of had that much difference in tread...
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thumper80 wrote:
Oct 28th, 2009 10:35 am
width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
As you can see in the comparison, diameter and Rotations per mile are different between the two, so it does make a difference...
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thumper80 wrote:
Oct 28th, 2009 10:35 am
width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
someone ban this guy for posting BS.

The middle number/aspect ratio (70 in this case) is percentage of width, not a fixed number.

Meaning it does affect the speedo calibration.
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thumper80 wrote:
Oct 28th, 2009 10:15 am
It won't affect it at all , if you were changing the height of the tire it would like from 195/70/r14 to a 195/75/r15 it would .
thumper80 wrote:
Oct 28th, 2009 10:35 am
width of the tire doesn't affect the speedo , it's the over height of the tire that affects the speedo calibration .
Tire 101 = Fail.

As others have pointed out the sidewall heights, 185*.70 versus 195*.70 are not the same.
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