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Motorsports & Track Forum
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Old 02-22-2006, 12:48 PM   #1
pwalsh53
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245's with 17X8.5

Just ordered some Kosei K1 17x8.5's. I'd like to know if

a. 245/45s are the best tire size for them
b. will 245s fit an E46 sedan? these will be purely for track days with no more than 2 people in the car.

Thanks!
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Old 02-22-2006, 05:56 PM   #2
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You can go with 245/40/17 or 255/40/17 all around on the Koseis. I used to run 255/40/17 on the Koseis all around on my 330i dropped on PSS9's. No rubbing front or rear (my rear fenders were already rolled for my non-track rims though).
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Old 02-22-2006, 08:12 PM   #3
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jw - but which tires?
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Old 02-25-2006, 02:40 PM   #4
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Old 02-27-2006, 10:59 AM   #5
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I was using Yokohama AVS ES 100 tires for the track. Pretty cheap, decent grip, decent wear.
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Old 02-27-2006, 05:49 PM   #6
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You will have no problems with 245s all around for the track. Im not sure, but you might run into problems with 255s in the front, if you have a drop, un less you are running alot of negative camber. Then again, the dude a few posts up said he ran 255s all around with no problem so it will probably be fine.

Whatever you decide, try to have the same tire size on all four corners. It makes rotating the tire for even wear much much easier. Not to mention the more neutral handling the car will have without such a tendency to push (understeer).

Best of luck
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Old 02-27-2006, 10:59 PM   #7
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So you have run 245/40s all around, no cutting/rolling of fenders, and had no problems?

My car is stock sport suspension with about an extra 1.25 degrees of negative camber (bimmer world street camber plates) up front.

Thanks!
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Old 02-28-2006, 03:53 PM   #8
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E46 sedan here as well. Chances are you might load the trunk with tools/jack etc on your way to the track, then in that case, yes it might rub.

You can prevent rubbing by going with a very stiff suspension setup and/or -3 deg camber. Kosei has ET40.

But on the track, they will be ok.

For that reason, I have two pieces of 245/40/17 tires that I am trying to get rid of.
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Old 02-28-2006, 07:32 PM   #9
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Yes you can!

Hey Patrick,

I have a 2004 330ci zhp and i have the exact thing you are getting kosei k1's with 245/40/17's all around.

i used dunlop supersport race when they used to be available in 245/40/17.
they were about $120 each, not bad for a r-compound tire, to bad they are out of production, for the price their perfromance was excellent, excellent grip, predictable and very good in rain as i tested them in Sebring just after a downpour.

Weight difference is also a factor since i am saving about 60lbs of unsprung weight compared to stock 18' and yes you can definitely tell the diference specially at the track!! The kosei's have been great, they are pretty strong wheels.!!

they should fit your sedan with no problems as you said you still have the stock sport suspencion which should give you plenty of clearence even with different camber.

Good luck and have fun out there.

Heres a pic of my car
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Old 03-03-2006, 09:49 AM   #10
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Originally Posted by PEDROJR
Hey Patrick,

I have a 2004 330ci zhp and i have the exact thing you are getting kosei k1's with 245/40/17's all around.

i used dunlop supersport race when they used to be available in 245/40/17.
they were about $120 each, not bad for a r-compound tire, to bad they are out of production, for the price their perfromance was excellent, excellent grip, predictable and very good in rain as i tested them in Sebring just after a downpour.

Weight difference is also a factor since i am saving about 60lbs of unsprung weight compared to stock 18' and yes you can definitely tell the diference specially at the track!! The kosei's have been great, they are pretty strong wheels.!!

they should fit your sedan with no problems as you said you still have the stock sport suspencion which should give you plenty of clearence even with different camber.

Good luck and have fun out there.

Heres a pic of my car
Where is the pics Pedro?
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