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2006-2009 Range Rover Sport
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57 Posts
Discussion Starter #1
Question for any IID Tool gurus here.

I currently have the stock tire/wheel setup on my 2008 RRS HSE. 255/50/19. My IID Tool shows a Tire Radius value of (364)
I am installing new tires which are 255/55/19. These are 1” taller over stock.

Any experience on what value to change it to for the larger tire size?

Apparently the values are just a signal value and don’t equate to any specific tire measurement.

Thanks in advance..
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JACK'S GRANDAD
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9,244 Posts
Your stock size equals 29.039"
So I'd guess that the tire radius value of 364 would equate 12.534 per inch of height?
That being the case, your new tire is 30.043" tall. Times that 12.534 gives you a new value of 376.5

Circumference of the old tire =91.22"
New tire 94.38

Same equation gives the same results pretty much, when using circumference, 376.609.

I'd say start there!
I'd check the LR4 that is under the knife, as it has 255/55 19, but its missing a lot of engine parts right now.
 

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2006-2009 Range Rover Sport
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57 Posts
Discussion Starter #3
Thanks leftlanetruckin,
I'll give that a try. I pick up the new tires next week.

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JACK'S GRANDAD
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9,244 Posts
anytime!
I did try to look into the LR4 with that size tire, but the GAP tool isn't fully unlocked for it yet, so couldn't see it anywhere

Martin
 
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