Use Tire Size 165/80/r13 Instead Of 175/70/r13

Iroshw · March 19, 2014

Hi,

I'm using a Mitsubishi C62A (known as APS Model) 1991 year car. Currently I'm using 175/70/R13 tires to the front wheels and 185/70/R13 to back.

I found 4 good tires, but the size is different - 165/80/R13 (rim size is fine). Please let me know whether I can install these tires to the car or not? As per the car manual the original tire size is 175/70/R13

Check this http://www.auto-data.net/en/?f=showCar&car_id=15671

Please help since the tires I got from a friend are very good condition. What are the faults occur if I install them?

Irosh

Magnum · March 19, 2014

Stick to manufacture size, fixing tyres wider than manufacture given size is not so good for your engine

Edit: i read it wrong, i thought you're increasing your tyre width

Edited March 19, 2014 by Magnum

Davy · March 19, 2014

Change in the width from 175 to 165 means the width of your tyre will decrease. This will result in:

- Lower grip

- Slightly lower (better) fuel consumption

- The car losing a bit of it's looks. Wide wheels make a car look nice.

Change in the profile (height of the sidewall) from 70 to 80. This will cause:

- Your speed o meter to show a slightly higher km/h value than the correct value. (Ex. a speed of approx 100km/h will be shown when the actual speed is 96km/h)

- Your engine to rev lower where it was a bit higher before at the same speed

- Slightly reduced acceleration (negligible I guess)

- The car to lose a bit of it's looks... again. Lower the profile the better.

The new tyre size is just not right IMO. And remember... just because you got a set of free tyres doesn't mean you have to use them.

harshansenadhir · March 19, 2014

On 3/19/2014 at 10:10 AM, Davy said:
Change in the width from 175 to 165 means the width of your tyre will decrease. This will result in:
- Lower grip

- Slightly lower (better) fuel consumption

fuel consumption may be increased as smaller tire needs to rotate more and hence high RPM of the engine to cruise at a certain speed.

On 3/19/2014 at 10:10 AM, Davy said:
- The car losing a bit of it's looks. Wide wheels make a car look nice.
Change in the profile (height of the sidewall) from 70 to 80. This will cause:

- Your speed o meter to show a slightly higher km/h value than the correct value. (Ex. a speed of approx 100km/h will be shown when the actual speed is 96km/h)

this is other way around machang as increased profile means higher circumference of the tire.

Therefore it’ll rotate higher distance than the smaller one in one rotation.

Speedo meter only knows the number of rotations of the wheel (in ABS models) / final drive (non ABS models) ; therefore your car will be traveling at a higher speed than what it shows in the meter.

On 3/19/2014 at 10:10 AM, Davy said:
- Your engine to rev lower where it was a bit higher before at the same speed
- Slightly reduced acceleration (negligible I guess)

- The car to lose a bit of it's looks... again. Lower the profile the better.

On 3/19/2014 at 10:10 AM, Davy said:
The new tyre size is just not right IMO. And remember... just because you got a set of free tyres doesn't mean you have to use them.

very well said ..

Hoonigan · March 19, 2014

To add to Davy's list, there will be a difference in your ground clearence and ride quality. and if the profile is too much, your front tyres will rub at full lock.

sadly, I cannot get my head around to figure out the extent to which any of these will impact you. If I'm not mistaken, each car has a range of acceptable tyre sizes as per the manufacturer, which would be the best place to get your answer.

Davy · March 19, 2014

On 3/19/2014 at 11:12 AM, harshansenadhir said:
fuel consumption may be increased as smaller tire needs to rotate more and hence high RPM of the engine to cruise at a certain speed.
this is other way around machang as increased profile means higher circumference of the tire.

Therefore it’ll rotate higher distance than the smaller one in one rotation.

Speedo meter only knows the number of rotations of the wheel (in ABS models) / final drive (non ABS models) ; therefore your car will be traveling at a higher speed than what it shows in the meter.

very well said ..

Oops! Sorry about that. I must have had my wires crossed while typing that. Thanks for pointing that out Harshan!

The Don · March 19, 2014

The difference in overall wheel diameter is 19mm, and the differnce from manufacturer spec is +3.3%. Usually its not recommended to go beyond +/- 2.5% from manufacturer spec.