Two different tyre sizes

dcfc91

Bought some new alloys for the car with 4 good tires on them, 185/60/15s. On my old steel wheels I have 195/65/15s. Two of which are good and two of which are near brand new.

Was thinking about sticking on the two brand new 65s on the back and leaving the two best 60s on the front but someone mentioned something to me about wheel speed sensors and how it might set the ABS off.

What do ye think lads? Am I better off just leaving it with 60s all around? Car is a Grande Punto btw.

Ded_Zebra

dcfc91 wrote: »

Bought some new alloys for the car with 4 good tires on them, 185/60/15s. On my old steel wheels I have 195/65/15s. Two of which are good and two of which are near brand new.

Was thinking about sticking on the two brand new 65s on the back and leaving the two best 60s on the front but someone mentioned something to me about wheel speed sensors and how it might set the ABS off.

What do ye think lads? Am I better off just leaving it with 60s all around? Car is a Grande Punto btw.

It will look better if they are the same all around.

As long as the sizes match on each axle there shouldn't be a problem with the ABS/wheel speed sensors

meeeeh

Is that actually legal in Ireland???!!

Ded_Zebra

meeeeh wrote: »

Is that actually legal in Ireland???!!

It's legal in every country I would imagine.


Many cars come from the factory with different tyre sizes front and rear.

dcfc91

Ded_Zebra wrote: »

It will look better if they are the same all around.

As long as the sizes match on each axle there shouldn't be a problem with the ABS/wheel speed sensors

That's what I thought myself. But they said that having a larger tire 65 vs 60 on the back would make the wheel speeds different and set off the sensors.

I know it will look better as well, thats def a consideration. But so is having the best tires on the car possible

meeeeh

Ded_Zebra wrote: »

It's legal in every country I would imagine.


Many cars come from the factory with different tyre sizes front and rear.

No it's not. Obviously not if the manufacturer recommends it for a reason. But I was actually asking because my parents own a garage in another country and no mismatched sizes (unless specified) or types (winter/summer) were allowed. You can have different profile on one one axis than the other but it has to be same size and type. Min depth for summer is 2mm and winter 4mm. Considering they rarely come up with the laws themselves I assume it was copied from Germans or Austrians.

Esel

Lower profile on the rear if mixing.

dcfc91

Esel wrote: »

Lower profile on the rear if mixing.

Any particular reason why?

Esel

dcfc91 wrote: »

Any particular reason why?

It's about six years since I did it, but that's what I found out via Google. Handling was the reason, afair.

jimbis

Different profiles are fine once the sizes are them same on the same axel. Not sure if different wheel size are legal but sure that's not a problem here.

I threw your sizes into https://tiresize.com/comparison/ and it'll be over an inch in height difference.

dcfc91

jimbis wrote: »

Different profiles are fine once the sizes are them same on the same axel. Not sure if different wheel size are legal but sure that's not a problem here.

I threw your sizes into https://tiresize.com/comparison/ and it'll be over an inch in height difference.

An inch is a fair difference, may end up leaving it if that's the case.

wingnut

meeeeh wrote: »

Is that actually legal in Ireland???!!

Would hope so or anyone using a space saver spare could be fined for it.

AMKC

wingnut wrote: »

Would hope so or anyone using a space saver spare could be fine for it.

But a space saver is only a temporary solution until you get your normal tire fixed or get a new one.

allthedoyles

What is legal and what is safe are two different things , and I would not fancy driving on country roads with different tyre sizes .

wingnut

allthedoyles wrote: »

What is legal and what is safe are two different things , and I would not fancy driving on country roads with different tyre sizes .

Tractors seem to manage it

Noveight

I have had 16" alloys on the front axle and 15" steelies on the rear for the past 2 months or so. No problems to report. As already mentioned, I'm sure it's fine unless you had different rim/tyre sizes at opposite ends of the same axle.

colm_mcm

Too big of a difference. Don't bother.

sundodger5

You are missing an important point. The profile is only half the story.
A profile is a percentage of the width of the tyre. So a 195/65 tyre has a sidewall height that is 65% of 195.
Hence the big difference mentioned above. Also please consider those tyres may have different speed ratings and different weight carrying capacity.
Will they keep the car rolling? Of course but it may affect safety.