changing tyre from 195/65/15 to 195/60/15

TonyJones

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As per title - is this an ok change ? I understand the speedo will be about 3% out based on the change.

Have been offered some w124 alloys where prev Owner has changed the tyres to the lower profile. Recipient car 230te with 195/65/15 tyres that need replacing!

Tia
 

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They should be 205 x 65 to be correct

The 165 tyres give a sidewall height of 107.25 mm and the 196 x 60 gives 99mm,, yes you will under read on the speedo, but only by a little bit
 
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TonyJones

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I thought the 205/65 where options, and only where 'sport ' suspension is fitted - well that's what my handbook says :)
 

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The choice is yours, and it does not make much difference, just a touch wider
 

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As per title - is this an ok change ? I understand the speedo will be about 3% out based on the change.

Have been offered some w124 alloys where prev Owner has changed the tyres to the lower profile. Recipient car 230te with 195/65/15 tyres that need replacing!

Tia

Speedo will not go 3% out by changing the tyre profile from 65 to 60. Its only going to make a difference if you change the total diameter by significant amount.

you may loose a slight amount of comfort by reducing the tyre size but it will not be very noticable
 

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Speedo will not go 3% out by changing the tyre profile from 65 to 60. Its only going to make a difference if you change the total diameter by significant amount.

you may loose a slight amount of comfort by reducing the tyre size but it will not be very noticable

Amo he has changed the diameter by changing the profile
 

SQ_W211

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changing profile from 65 - 60 is going to change the diameter by 19mm. will that make 3% difference?
 

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changing profile from 65 - 60 is going to change the diameter by 19mm. will that make 3% difference?

16mm thats just over ½ inch

I partly miss read the post sorry
 

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Perhaps it will make a difference but surely not 3%
 

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Ok lets stop the discussion then ha ha ha.

Hope you been well Malc, I have been busy with work so not been able to spend much time on here recently
 

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Ok lets stop the discussion then ha ha ha.

Hope you been well Malc, I have been busy with work so not been able to spend much time on here recently

Well that makes it all the nicer when you come back Amo:D We do miss you at times ;)
 

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Glad to hear it Malc......
 

The Pan Man

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Chaps its all about the circumference. i.e. How far the wheel moves forward per 1 revolution. Do the maths, I was quite good at school but, that was 45 years ago.
 

antijam

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Does look like it's 3% guys....

Tyresize.jpg


In one rev of the wheel the speedo thinks the car has travelled 1992mm.

On the new tyres it will only have travelled 1932mm ..... 3% less.

So the speedo will be optimistic by 3% which, assuming it was calibrated correctly to start with, is well within the legal tolerance of 0 to +10%.

(note that it is however greater than the 2.5% recommended by etyres)
 

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Amo was right,,I even got that 19mm wrong :( I am going to bed and cry myself to sleep:(
 

antijam

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Amo was right,,I even got that 19mm wrong :( I am going to bed and cry myself to sleep:(

Cheer up Malcolm. Just because you're feeling old, incompetent and useless doesn't mean the rest of us think so. :)

....Not all of us anyway. ;)
 
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Thank you antijam,, just thinking on this, the difference between new and worn tyres is some 13mm and that must make a difference of 2%
 

antijam

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Thank you antijam,, just thinking on this, the difference between new and worn tyres is some 13mm and that must make a difference of 2%

Absolutely Malcolm - and even different makes of tyre of nominally the same size have slightly differing rolling radii.

So if you want to go for your best 0-60 time do it on worn (possibly to the point of 'slick' ) tyres. Not only will your speedo tell you you got there quicker, you actually will have got there quicker because of the lower effective gearing!
 
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TonyJones

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antijam, used a similar site to do the maths.. Speedo reads 70mph, actual 67.85.

Anyway have bought the wheels/tyres. Alloys are perfect with 7mm of tread on the tyres. All for £101 on ebay - better than spending at least double that for tyres:D

Anyone need some steel wheels with worn out tyres?
 

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