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      01-26-2018, 04:08 PM   #1
Genieman
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Tire size question

Ok so have a couple of questions:

my 340i xdrive with Msport has the 400m wheels. Tires are 225/45/18

overall diameter is 25.97

if i were to go up to 19s and got 225/40/19, the overall diameter would be 26.09, or a 0.4% increase. I see a lot of people with aftermarket set ups going with 235/35/19 which has an OD of 25.48 or a decrease of 1.9%.

Why is that the choice when people go to 235 width? Meaning, why not go with 235/40/19 which would make the OD 26.4 or an increase of 1.7% over stock and provide a tiny bit more ride comfort from the extra rubber as well as take away an additional (albeit small amount) of wheel gap??

Is there an OD that becomes too much from the stand point of rubbing in front when steering wheel is turned all the way?

Just curious, I'm not at a point where I am getting new wheels and tires just yet, but when figuring out what works, was wondering why people reduce the OD rather than increasing it to fill out the wheel well and get more rubber cushion

Last edited by Genieman; 01-26-2018 at 04:21 PM.
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      01-26-2018, 06:42 PM   #2
alohasurftoad
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one reason to go lower OD for the shorter sidewall is performance if your are tracking the car. this i understand.

most do it only for looks. typically the same peeps that do stretched tires, hella flush, slammed, stanced. personally i'm not a fan but "to each their own".

there is a limit to how large over you could go but the size you listed is fine
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      01-26-2018, 09:40 PM   #3
Genieman
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Quote:
Originally Posted by alohasurftoad View Post
one reason to go lower OD for the shorter sidewall is performance if your are tracking the car. this i understand.

most do it only for looks. typically the same peeps that do stretched tires, hella flush, slammed, stanced. personally i'm not a fan but "to each their own".

there is a limit to how large over you could go but the size you listed is fine
Thanks the reply. Curious if you know the max OD that we can do. Is 245/40/19 ok? (Assuming either square set up or non-square but matching OD in the rear.)
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      01-26-2018, 10:11 PM   #4
alohasurftoad
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Quote:
Originally Posted by Genieman View Post
Thanks the reply. Curious if you know the max OD that we can do. Is 245/40/19 ok? (Assuming either square set up or non-square but matching OD in the rear.)
245/40/19 is 26.7" dia. and a 3.9" sidewall. it's a bit tall and meaty but doable. In this case I rather the 245/35/19. Up to you, though

http://f30.bimmerpost.com/forums/sho...=245%2F40%2F19

Last edited by alohasurftoad; 01-26-2018 at 11:03 PM.
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