20x9 ET 35 - Audi Q3 Forum
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post #1 of 22 Old 05-20-2015, 05:53 AM Thread Starter
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20x9 ET 35

I'm looking at a set of rims that are 9" width and offset of 35. Will it fit flush with the fenders or will they extend out?

What is the rim spec of the 18" rims that come standard on Q3 premiums?

Thanks


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post #2 of 22 Old 05-20-2015, 11:01 AM
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The 'standard' wheel is 7x18 et 43; the next is 8.5x19 et 36; and then 8.5x20 et 36

So if you use 9x20 et 35 almost the entire extra half inch (except the skinny mm) of width over the 19s or 20s that Audi use, will be split evenly inwards and outwards, from the upmarket (19-20) wheel. So you can figure about a 1/4 inch each way ... that help?


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post #3 of 22 Old 05-20-2015, 11:07 AM
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oh, and from the 'standard' wheel, the reduced offset plus the added width 'fills' the wheel well more to the outside, but also adds some to the inside. The change in offset (reduced positive by 8mm or about a 1/3 inch) contributes to a moving 'inward' but the extra width (1 1/2") contributes to a larger outward result (as well as a larger inward one too) ...

Net result is something like :

1 1/2 inches divided by 2 = 3/4"+ 1/3" to the inside
3/4" -1/3" added to the outside ...


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post #4 of 22 Old 05-20-2015, 11:37 AM Thread Starter
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From the widest OEM wheels(8.5 ET 36) to the wheels I'm about to order (9.0 ET 35), looks like it will add 5mm inward and add 7mm... I'm wondering if this added 5mm inward will cause problem with strut....


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post #5 of 22 Old 05-20-2015, 11:39 AM
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Quote:
Originally Posted by Tanqueray View Post
From the widest OEM wheels(8.5 ET 36) to the wheels I'm about to order (9.0 ET 35), looks like it will add 5mm inward and add 7mm... I'm wondering if this added 5mm inward will cause problem with strut....
Hang on - I'll go look ...


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post #6 of 22 Old 05-20-2015, 11:49 AM
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okay, strut is fine - it's the lower spring cap you'll have to worry about - and this will depend on what tire size you pick to go with those wheels. If you add even a few millimeters of OD or width of the tire shoulder, you may have a clearance issue with it. If your OD is the same or a tiny bit less, I think you'll be fine with up to 255s, but I don't think I'd try 265s ...


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post #7 of 22 Old 05-20-2015, 11:53 AM Thread Starter
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Thank you so much for checking it out.

I was planning on 255/35/20 tires and lowering the car about 30-35mm using new springs and shocks.

Do you think maybe adding a 5mm spacer may help with clearance?


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post #8 of 22 Old 05-20-2015, 11:55 AM Thread Starter
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There's a Q3 that's on 9" ET 26 with 5mm spacer with 255/35/20 tires, that seems fine. If my calculation is correct, he's basically running 9" ET 21.... am I right?

And if I run 9" ET 35 with 5 mm spacer (to ensure I don't hit spring cap), it would be 9" ET 30.

I wonder if i would be okay with the same tires.


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Last edited by Tanqueray; 05-20-2015 at 12:01 PM.
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post #9 of 22 Old 05-20-2015, 12:14 PM
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The 5 mm spacer about makes up for the reduced offset - I have 255/40-19s and the factory spec for 20s is 255/35 (same OD as me) which I think would be okay with the 9s. I'd be careful with spacers at that offset as your moving the whole thing now out farther from the wheel bearings. There's only so much cantilever they can stand ... also, lowering will change camber (in at the top) where you can't adjust (unless you get camber plates too) and might have clearance issues otherwise (unless all the lowering is coming from the bottom of the spring cap - or if you're using smaller diameter springs and new caps which could give you plenty of clearance). I think with 255s though you should be okay as long as your OD is close or less than mine (27.0").

What kind of shocks/springs are you looking at?


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post #10 of 22 Old 05-20-2015, 12:20 PM Thread Starter
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I'm considering this one

I plugged in the tire size and gave me 27.028" of OD.

Do you think I should be okay?


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