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Changing Tires

D

dannybek

Golden Member
My mother's car needs new tires. She owns a Galant 02 ES. The tires are 195 and I would like to put 205 on them. Will I have to change the rim? I'm clueless here. Someone lead me to the right direction.
 
The 195 is the width of the tire in millimeters. So the 205 size tire is 10 mm wider. I'm sure the current wheels should accomodate the slight increase in width just fine.
 
Originally posted by: Henrythewound
its only a diff of 2 cm, but any tire shop should be ale to answer it over the phone. Why do you want 205s?
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Maybe because all his other homies are rollin' on 205s.
 
Maybe because all his other homies are rollin' on 205s.
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Lol

They should fit np, but the speedometer will be off by a tiny bit (the tires will be taller if you use the same series). Likely less than 1% with only one tire size different.
 
Originally posted by: PricklyPete
Originally posted by: NutBucket
Its your mom...why????
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You know the answer...because his mom lets him borrow it from time to time...
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Point number 2: Its a stock fvcking Galant.....WHY? If you had a VR-4 then it'd be different but this sure as hell isn't anything like a VR-4.
 
Originally posted by: Doublejr
Maybe because all his other homies are rollin' on 205s.
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Lol

They should fit np, but the speedometer will be off by a tiny bit (the tires will be taller if you use the same series). Likely less than 1% with only one tire size different.
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Not if the sidewall height is the same.

Tire size is specified as follows:

205/55/15
205 - 205mm tire width
55 - sidewall height is 55% of the tire width
15 - 15in wheel diameter

Speed is determined on a log scale, so your spedometer will be off more the faster you are going. Still not by much if you go from, e.g. 195/65/14 to 205/60/14. The wheel should accomodate a fatter tire, but it may not be as safe or cause wear on the tire.
 
what do you mean on a log scale? I thought it (the speedometer) measured the RPMs of the wheel. Assuming a factory tire size you would go a specific distance (the circumference of the tire) per RPM, thus your speed (d/t). I am curious about this relationship and hether or not I have it wrong because I put larger tires on my truck and have been thinking I was off by a constant % regardless of my speed.

Correct me?
 
not because of the width, but because you cant easily get an exact same sidewall height even if you go down a size. A 195/65 would have a sidewall height of 125.75 mm while a 205/ 60 would have a 123 mm sidewall. A 205/65 would have a sidewall height of 133.25 mm, No exact match is possible in this case.
 
Originally posted by: NutBucket
Originally posted by: DivideBYZero
Originally posted by: daveshel
Her speedometer will be off by about 5%.
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Because the WIDTH of the tyre increases? Get out!
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Come on now, you know sidewall height is proportional to width!
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I know that but as others have said you use a lower profile tyre. As Speedo's are not acurate anyway it's hardly a big sh1t, is it?
 
Originally posted by: DivideBYZero
Originally posted by: NutBucket
Originally posted by: DivideBYZero
Originally posted by: daveshel
Her speedometer will be off by about 5%.
Click to expand...

Because the WIDTH of the tyre increases? Get out!
Click to expand...
Come on now, you know sidewall height is proportional to width!
Click to expand...

I know that but as others have said you use a lower profile tyre. As Speedo's are not acurate anyway it's hardly a big sh1t, is it?
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Not really. It should be labeled "approximate" speed😉😀

"Yes Officer, I was travelling at approximately 65 mph"
 
Originally posted by: NutBucket
Originally posted by: DivideBYZero
Originally posted by: NutBucket
Originally posted by: DivideBYZero
Originally posted by: daveshel
Her speedometer will be off by about 5%.
Click to expand...

Because the WIDTH of the tyre increases? Get out!
Click to expand...
Come on now, you know sidewall height is proportional to width!
Click to expand...

I know that but as others have said you use a lower profile tyre. As Speedo's are not acurate anyway it's hardly a big sh1t, is it?
Click to expand...
Not really. It should be labeled "approximate" speed😉😀

"Yes Officer, I was travelling at approximately 65 mph"
Click to expand...

Agreed!
 
Originally posted by: Henrythewound
what do you mean on a log scale? I thought it (the speedometer) measured the RPMs of the wheel. Assuming a factory tire size you would go a specific distance (the circumference of the tire) per RPM, thus your speed (d/t). I am curious about this relationship and hether or not I have it wrong because I put larger tires on my truck and have been thinking I was off by a constant % regardless of my speed.

Correct me?
Click to expand...

Log scale = logarithmic scale
 
A related question - why are tire sizes specified with two dimensions and an aspect ratio instead of three dimensions?
 
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