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The Tire Rack's Tire & Wheel Forum
Use this forum to discuss anything in relation to wheels to tires to offsets.
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Old 02-23-2011, 12:15 AM   #1
FalconBMW
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Sedan w/ H&R Cupkit on 18x8.5 ET40?

Yes, it's another "help me with my offset" thread. Before you jump the gun and tell me to search, I already have. I'm sure this question has been beat to death in another thread, but after a good search I didn't see it, and all of the best information seems to be on coupes, 19's, or different suspension kits.

So, to the question. Does anyone have first hand experience with running a squared setup of 18x8.5 ET40's (w/ 225/40/18 tires) on a sedan with the H&R (non-sport) Cupkit for the sedan? I've seen several pictures that are similar to this, and they definitely seem to fit, but more importantly I am wondering how prone they are to rubbing? While they will clear the lip of the fender, I worry about hitting directly behind it in the tirewell and the possibility of causing damage.

My car is running without an alignment or camber kit, so I do have some negative camber in the rear (may not be evident in the pics below) but it is probably a pretty negligible amount. I rarely have other people in the car, if so it's only my girlfriend riding shotgun, but there will be ~50lbs of subwoofer/enclosure in the back shortly. Also, Ohio roads aren't exactly known to be the best

Hopefully I provided enough information specific to my car and driving style to get some good feedback on this setup. I understand all cars are different and the same setup on another car may not behave the same way, but I'm just looking to gain an overall opinion on practicality of this because it is my daily driver. I'm also curious about 19's, but I'm concerned that rubbing issues will be even worse, and that I will lose some performance as well as having a even harsher ride.

Below are some more recent pictures than the one in my sig. I still need to get some new ones because the car has changed more, but these highlight the H&R Cupkit well.



Feel free to give me input and thanks for looking
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H&R Cup Kit///Meyle HD Control Arms & Strut Mounts w/ Z4 Reinforcement Plates///M3 Subframe Bushings & RTAB's///OEM Sourced SSK
Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

Coming Soon: Alpine INA-W910, Alpine Type X 12" (MB Quart Mono), VMR V710 Hypersilver 19's, M-Tech II, more.

Last edited by FalconBMW; 02-23-2011 at 12:19 AM.
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Old 02-23-2011, 12:28 PM   #2
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18x8.5 ET40 with a 225/40/18 will be just fine with the H&R Sport or Touring Cup Kit. That is a pretty conservative wheel and tire combo so you will have plenty of room. You can go up to a 9.5 ET45 with a 245/35/18 or 255/35/18 in the rear.
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Old 02-23-2011, 12:35 PM   #3
FalconBMW
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Quote:
Originally Posted by Nick@Jlevi SW View Post
18x8.5 ET40 with a 225/40/18 will be just fine with the H&R Sport or Touring Cup Kit. That is a pretty conservative wheel and tire combo so you will have plenty of room. You can go up to a 9.5 ET45 with a 245/35/18 or 255/35/18 in the rear.
Are 19's pretty much out of the question without rolling my fenders?

Would you recommend a run a higher offset if I stay with the 8.5's? I want it to be a good compromise between aggressiveness, and well...lack of rub haha
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Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

Coming Soon: Alpine INA-W910, Alpine Type X 12" (MB Quart Mono), VMR V710 Hypersilver 19's, M-Tech II, more.
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Old 02-23-2011, 12:42 PM   #4
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You can run 19s easily, 19x8.5 ET40 with a 235/35/19 all around or if you want staggered, 19x8.5 ET40 235/35/19 and 19x9.5 ET45 245/35/19.
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Old 02-23-2011, 12:47 PM   #5
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Originally Posted by Nick@Jlevi SW View Post
You can run 19s easily, 19x8.5 ET40 with a 235/35/19 all around or if you want staggered, 19x8.5 ET40 235/35/19 and 19x9.5 ET45 245/35/19.
I love the look, but will I be sacrificing much ride quality, wheel protection (smaller sidewalls), or performance at all?
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H&R Cup Kit///Meyle HD Control Arms & Strut Mounts w/ Z4 Reinforcement Plates///M3 Subframe Bushings & RTAB's///OEM Sourced SSK
Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

Coming Soon: Alpine INA-W910, Alpine Type X 12" (MB Quart Mono), VMR V710 Hypersilver 19's, M-Tech II, more.
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Old 02-23-2011, 05:34 PM   #6
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Quote:
Originally Posted by Nick@Jlevi SW View Post
You can run 19s easily, 19x8.5 ET40 with a 235/35/19 all around or if you want staggered, 19x8.5 ET40 235/35/19 and 19x9.5 ET45 245/35/19.
Hate to double post, but I looked and VMR doesn't have the V710's in a ET40 for the 19x8.5....I should be safe with a 35 offset and the same tires though right?
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H&R Cup Kit///Meyle HD Control Arms & Strut Mounts w/ Z4 Reinforcement Plates///M3 Subframe Bushings & RTAB's///OEM Sourced SSK
Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

Coming Soon: Alpine INA-W910, Alpine Type X 12" (MB Quart Mono), VMR V710 Hypersilver 19's, M-Tech II, more.
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Old 02-23-2011, 05:46 PM   #7
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For the V710s, you would need the 19x8.5 ET35 and 19x9.5 ET45 front and rear with the same tire sizing.
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Old 02-23-2011, 07:53 PM   #8
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Originally Posted by FalconBMW View Post
I love the look, but will I be sacrificing much ride quality, wheel protection (smaller sidewalls), or performance at all?
Yes Indeed.
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Old 02-23-2011, 09:43 PM   #9
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Yes Indeed.
To what degree?
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Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

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Old 02-23-2011, 10:06 PM   #10
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To what degree?
Loss of power
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Old 02-23-2011, 11:02 PM   #11
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Loss of power
Well I do get the concept of rotational mass and that the engine will have to harder to turn the wheels since they are a pound or two heavier, but the big question is will it even be noticeable on an unmodded 2.5L? Not necessarily worried about shaving weight in every area as a track car owner would be. On the other hand I know that tires with shorter sidewalls tend to have better lateral grip.

Other than that the only downsides I know of are they are more likely to be bent because of potholes, but if you hit a pothole that hard an extra half an inch of sidewall probably wouldn't do too much good anyway.

Ride quality doesn't really exist on my car anyway lol...the suspension is so tight with all of the upgrades that you feel every bump.
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[IMG]http://************/6brrz3o[/IMG]
H&R Cup Kit///Meyle HD Control Arms & Strut Mounts w/ Z4 Reinforcement Plates///M3 Subframe Bushings & RTAB's///OEM Sourced SSK
Rebuilt Trans///JleviSW Blackout grill///Smoked Corners, Sidemarkers, Eagle Eye Tails///Khoalty LED's

Coming Soon: Alpine INA-W910, Alpine Type X 12" (MB Quart Mono), VMR V710 Hypersilver 19's, M-Tech II, more.

Last edited by FalconBMW; 02-23-2011 at 11:03 PM.
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