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Tire Rack's Tires, Wheels, Brakes & Suspension
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Old 01-06-2013, 08:19 AM
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IndiansFan IndiansFan is offline
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Mein Auto: '99 528iA
Wheel Compatability

I need help with understanding the concept of wheel offset.

Will an ACS type II - 18" x 8.5" bolt pattern 5 x 120 - 45mm offset fit on an E39 528i or E39 530i? I know the bolt pattern is correct, but the 45mm offset has me concerned. Do I need to add a wheel spacer?


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Benjamin Franklin

2004 X3 2.5 TITANIUM SILVER/Grey - Sport/Premium Package
2001 530iA STEEL BLUE/Sand - Sport/Premium/Cold Package
1999 528iA JET BLACK/Black - Sport/Premium/Heated Seats
1982 Fiat 2000 Spider - BLUE METALLIC/Blue
1999 528iT CASHMERE BEIGE/Sand - Sport/Premium Package - 5 speed SOLD
1989 535i SALMON SILVER/Black SOLD
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Old 01-07-2013, 05:49 AM
wcr3d wcr3d is online now
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Mein Auto: 2013 535iX M Sport
The offset is the vertical center of the wheel. Negative moves the center to the inside of the wheel well and positive to the outside. You will have some variables due to the width of the wheel, width of the tire and if you use spacers to push a high number negative back to the outside of the wheel well. Also consider overall width of the wheel and tire for clearance of the fender lip, struts....etc.
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Old 01-08-2013, 10:40 PM
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whinojosa whinojosa is offline
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Mein Auto: 325i W/O CDV
You will need a spacer for the ACS 18 x 8.5" et45. You'd probably want around a 20mm - 25mm spacer to be right in your sweet spot - generally 15mm - 30mm.

The 5-Series is generally a low offset fitment. Meaning your wheels need to "stick out" or protrude slightly from the hub (compared to 3-Series) to avoid hitting your suspension/braking components. Luckily you have a little more flexibility in wheel choice because of this fact, you can always bring the wheel's offset down with a spacer.

Us 3er's can't afford that luxury as the chassis is set up for a high offset, generally 40mm+. Spacers only lower the offset. A low offset (20-30mm) on the 3-Series chassis will stick out too far into and past the wheel well and will rub the fenders.

Hope this makes sense and helps!
- Will

Los Angeles BMWCCA Member#415991
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