Wheel offset question.

Inter2010 · 03-31-2010, 07:42 AM

Hey Guys,

I have a quick question. I have an 07 335i coupe with sports package. Right now I have the stock rims with some winter tires, but as it is getting warmer out, I want to get a new set of wheels. I still have the tires I took off the stock rims with a lot of thread on them, so I figured I'd just get some 18's and put those tires on them.

I'm thinking of getting rims with these specs:

Front: 18" x 8" with 32 offset, backspacing of 5.76 and center bore of 74.1
Rear: 18" x 9.5" with 35 offset, backspacing of 6.63 and center bore of 74.1

The stock sports package setup is 18x8 up front with 34 offset and 18x8.5 in the back with 37 offset, right?

If that's correct, using that offset calculator, i get:

Front: 2mm MORE clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 2mm

Rear: 11mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 15mm

Is that right? How would that look?

Also, is it ok to run 255 tire over the 9.5 rim in the back?

Thanks for any help!

George

MassBimmer · 03-31-2010, 09:43 AM

They should work fine but you'll need hubcentric rings because the center bore you have listed is too big. 255 will add some stretch in the rear and should fit fine on a 9.5" wide wheel.

ALUFELGEN · 03-31-2010, 10:37 AM

Everything should work fine. Keep in mind you`ll need hub centric rings from 74.1 to 72.56.

Inter2010 · 04-01-2010, 08:44 AM

Thanks for the responses, guys.

But how flush would the wheels look? 15mm seems like a big difference from the current in the back?

Do the hubcentric rings push the wheels out more too like spacers?

Thanks again for all the help.

MassBimmer · 04-01-2010, 10:39 AM

1 inch = approx 24 mm. While 15 mm will be noticeable, it's not going to be outrageous. Hubcentric rings fill in the space between the new wheel's larger center bore and the smaller center bore of your hub...they will not push the wheels out.

03-31-2010, 07:42 AM	#1
Inter2010 New Member 4 Rep 22 Posts Drives: 2007 BMW 335i SG Join Date: Oct 2009 Location: Detroit, MI iTrader: (0)	Wheel offset question. Hey Guys, I have a quick question. I have an 07 335i coupe with sports package. Right now I have the stock rims with some winter tires, but as it is getting warmer out, I want to get a new set of wheels. I still have the tires I took off the stock rims with a lot of thread on them, so I figured I'd just get some 18's and put those tires on them. I'm thinking of getting rims with these specs: Front: 18" x 8" with 32 offset, backspacing of 5.76 and center bore of 74.1 Rear: 18" x 9.5" with 35 offset, backspacing of 6.63 and center bore of 74.1 The stock sports package setup is 18x8 up front with 34 offset and 18x8.5 in the back with 37 offset, right? If that's correct, using that offset calculator, i get: Front: 2mm MORE clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 2mm Rear: 11mm LESS clearance on the strut side, and the outside edge of the wheel will EXTEND an extra 15mm Is that right? How would that look? Also, is it ok to run 255 tire over the 9.5 rim in the back? Thanks for any help! George
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03-31-2010, 09:43 AM	#2
MassBimmer Major General 306 Rep 7,433 Posts Drives: 2023 i4 M50 Join Date: May 2009 Location: MA iTrader: (6) Garage List 2009 BMW [9.24]	They should work fine but you'll need hubcentric rings because the center bore you have listed is too big. 255 will add some stretch in the rear and should fit fine on a 9.5" wide wheel.
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03-31-2010, 10:37 AM	#3
ALUFELGEN 171 Rep 2,057 Posts Drives: E92 M3 Join Date: Nov 2008 Location: South Florida iTrader: (5)	Everything should work fine. Keep in mind you`ll need hub centric rings from 74.1 to 72.56.
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04-01-2010, 08:44 AM	#4
Inter2010 New Member 4 Rep 22 Posts Drives: 2007 BMW 335i SG Join Date: Oct 2009 Location: Detroit, MI iTrader: (0)	Thanks for the responses, guys. But how flush would the wheels look? 15mm seems like a big difference from the current in the back? Do the hubcentric rings push the wheels out more too like spacers? Thanks again for all the help.
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04-01-2010, 10:39 AM	#5
MassBimmer Major General 306 Rep 7,433 Posts Drives: 2023 i4 M50 Join Date: May 2009 Location: MA iTrader: (6) Garage List 2009 BMW [9.24]	1 inch = approx 24 mm. While 15 mm will be noticeable, it's not going to be outrageous. Hubcentric rings fill in the space between the new wheel's larger center bore and the smaller center bore of your hub...they will not push the wheels out.
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