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tires


joanmarie's Avatar
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04-25-04, 10:29 AM   #1  
joanmarie
tires

The used car i bought needs new tires. It is a 2000 Grand Am Sedan, 6 cyn.
The tires on it are P215/60R15. Do I have to go with that same size, or can I go to a different size? If so, what size? Thank you

 
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04-25-04, 10:40 AM   #2  
fordman30
look inside the driver side door and it will tell you what size is recommended for the car.you need to stay close to the right size to keep the best gas milage .lord knows gas isnt getting any cheaper,the size you stated sounds about right for that particular car.you might could go with a 205/70/15 .

 
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04-25-04, 11:49 AM   #3  
I would suggest staying with the original equipment size.The suspension was designed with that tire size in mind.If you change sizes handling characteristics of the vehicle will be affected.

 
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04-25-04, 03:25 PM   #4  
No, you can't. That's a taller tire. Outside of suspension engineering problems, you will encounter computer problems both with ABS and mixture calculations for the PCM. You will change inputs like VSS, engine load sensors and shift points. It ain't like the old days. Besides, the rim will be set for the OE tire. Don't even deviate from the OE speed rating. You encounter very noticeable handling differences.


Last edited by Sharp Advice; 04-26-04 at 06:51 AM.
 
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04-25-04, 08:56 PM   #5  
fordman30
desi did you read my first suggestion and the thing i said you MIGHT, might being the keyword............ive been in the tire business for quite awhile myself.


Last edited by Sharp Advice; 04-26-04 at 06:50 AM.
 
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04-26-04, 05:17 PM   #6  
Posted By: fordman30 i said you MIGHT, might being the keyword............ive been in the tire business for quite awhile myself.
It's not even a "might". It's an incorrect substitution for that size. A "minus 1" application would require a different aspect ratio AND a change to 14" rim to be a legitimate substitution. 195/70/14 would be the correct substitution to maintain correct height and sidewall stance. You can't save money by substituting different tire sizes without causing problems.

 
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