face palm!
- Thread starter adam1942
- Start date
lmfao at that link u put in ure first post how can changing the width increase the rolling radius . . . . .. . . full of poo
Because the profile is a percentage of the tyre's width
Eg 215/45 will have a 96.75mm sidewall
195/45 will have a 87.75mm sidewall
So, the diameter of the wheel/tyre combo varies 9mm even though profile 'value' and rim are identical
Lmfao how does the side wall change width on a 45 Tyre answer it doesnt only way it changes if u went 50 or 40 full of shiiiiiiiiittttttttttt
ffs lol Read post 27......
The aspect ratio is a percentage of the width of the tyre. So a 195/50/15 tyre with have a section hight of 97.5mm.
Because that's the size Renault put on it.
I'll have to check this out maybe I am wrong but show me the equation for working out aspect ratio please?
The aspect ratio is a % of the width. Therefore a 195/60R15 and a 205/55R15 are similar (Mk1/2 Mondeo w/15" wheel), or a 175/65R14 is similar to a 185/60R14 (Mk5/6 Escort), 185/60R13 Vs 165/65R13 Vs 155/70R13 (Mk1 Ka/Mk3 Fiesta) are all the same - the aspect ratio has to alter to accomodate the changed width.
Are u 100 % certain it's not just the profile size? I agree if you put a smaller wheel on the profile size has to accommodate the turning of the wheel etc but I can't grasp how changing the tread width of the tyre increases the turn of the wheel. Eg I put 225 45 17 in a wheel instead of 215 45 17 yes the tread width is increased but not the amount the wheel turns
I've read that snd it makes no sense because it doesn't show me how the tread width affects the rotation of the wheel
Lol
Right on my Clio i have OZ Ultraleggeras.... 15x7J
I have on them a 195/50/15 tyre.
The Aspect ratio of that tyre is 50. So 195 divided by 50 gives 97.5
So my Section height of the 195/50/15 tyre is 97.5MM.
With this size tyre my rolling radius is 180.96 cm, and the diameter is 57.60 cm.
So I wake the next day and decide i want a wider tyre. I'll go for the same size but with a width of 205. Which on a 205/50/15 tyre the section height will still be 50% but of 205mm NOT 50% of the 195MM on the previous tyre.
This gives me a section hight of 102.5MM And due to this higher measurement of the section height it brings the Rolling radius to 184.10 cm and the diameter to 58.60 cm
Just to be clear the Aspect ratio (40,45,50etc) on the side of a tyre is NOT a measurement, It's a percentage of the width of the tyre. The name does kind of give it away lol
What it illustrates, is that in the first example, with a 15" wheel, a 195/60 gives the same approximate circumferance as a 205/55. Because the width has increased (from 195 to 205) the ratio must decrease (from 60% to 55%)to retain the same diameter and circumference. Increased width means reduced aspect ratio
In the second example, with a 14" wheel, the width increases from 175 to 185, so the ratio must decrease from 65% (175/65R14) to 60% (185/60R14). Increased width means reduced aspect ratio
In the third example, if you have a 155/70R13 tyre on a 13" wheel, and want to fit a 165 tyre, you must reduce the ratio from 70% to 65% (165/65R13). If you want to fit a 185 tyre the ratio must decrease further to 60% (185/60R13). Increased width means reduced aspect ratio
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