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Q5 max tire aspect ratio.

12682 Views 5 Replies 3 Participants Last post by  moonan
Hello all,

Received my Q5 recently (offroad pkg) and immediately switched to factory 18" rims at dealership smallest available for Q5.

Based on reviews, I knew it was a rigid ride but thought that with the 18's I'd be able to soften it considerably; haven't hit the sweet spot yet; my back telleth me so...

What would happen if I changed to tires with a larger sidewall height (aspect ratio)? Factory installed are 60; can I go to 65, and, will it further soften the ride? If not, can I install 17" rims on the Q5 or would the Audi designer police come to snatch me in the middle of the night? (17's seem to have a much larger choice of A/T tires to choose from). I suppose width has to remain at 235?

I live in a country with less than ideal roads..

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Your Q5 comes now with 18"-rims and the correct /60 tyre ratio in order to keep the diameter of the wheel at the right value, what is important for mileage and speed readings), but the ordinary Q5 comes with 17"-rims (235/65/17)
Switching to 235/65/18 will alter the readings and therefore is not allowed (see the conformity certificate)
The only combinations are
245/50/20 (width has no effect on the diameter, but is function of the width of the rim, here 1/2 inch wider)

Comfort beeing proportional to the high of the tyre, the only way to go if you are not satisfied of the ride of the /60 tyres is to retrofit 17"rims with /65 tyres; within a reasonnable mileage, you dealer will probably accept to switch free of costs (my dealer promised this, but I stayed on my 235/55/19, in my opinion the shortest tyre that preserves an acceptable comfort
By way of comparison, my Q5 is softer than all A4 I tested before buying the Q5
little precision : comfort depends on the height of the tyre, not the wheel
I'm surprised that you consider the 18"-rims as not soft enough, because tyres with an aspect-ratio of /60 are nowadays absolutely common on (older) limousines. On his 235/55/19 rims my Q5 behaves largely as smooth as my Saab Convertible (215/55/16). It is an advantage of the SUV's that they are equipped with bigger wheels (and higher tyres) than their limo sisters (an A4 has 225/45 on 18"-wheels, that is two measures shorter and significantly harder)
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