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Go Back   E46Fanatics > Tuning & Tech > The Tire Rack's Tire & Wheel Forum

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 04-20-2017, 06:50 PM   #1
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Wheel sizes

Hey guys! New to the forum! First off I want to say I'm new to the whole offset wheels and sizing for a vehicle. Never got into customizing until now. I drive a 2000 323i. I'm looking at a set of beyern spartan matt black wheels. The fronts are 18x8.5 with the offset of 40 and the backs are 18x9.5 with the offset of 45. Any chance these will fit my car? They are asking $300 obo for the set and I don't really want to pass them up since they are nice wheels and in mint condition. Let me know. Thanks guys!
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Old 04-20-2017, 07:55 PM   #2
Darios e46
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That should help you figure out fitment on the car

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Old 04-21-2017, 08:20 AM   #3
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Tire and Wheel Calculator

I've been trying to understand tires and wheels too. This link is helpful as it shows you where your present configuration sits versus a new set with different numbers. You can do wheels only and add spacers if needed. Its pretty handy and one of the better ones I've seen.
Into full frontal nerdity.
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Old 04-21-2017, 09:34 AM   #4
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They will fit fine. Fronts will be more flush than the rear, but they will fit no problem

EDIT: actually you may need like a 5mm spacer in the rear if it gets too close to the inside firewall of the wheel well, fender clearance should be okay

Last edited by asianisafish; 04-21-2017 at 09:35 AM.
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Old 04-21-2017, 01:09 PM   #5
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Those should fit fine. The front tires will want to be a 225/40x18, the rears will dial in at about 245/35x18, give or take. I forget what the rear tires will be, but there are lots of calculators that will tell you the circumference of the 225/40 and the specs of the next wider tire with the same circumference -- or close enough to not confuse the ABS/DSC, DSC being the more critical to not be confused).

Basically, if you have a 225/45x17, and go to an 18 then you need to reduce the aspect ratio by 5, giving you a 225/40x18. If you run the numbers, these two tires are identical in overall diameter even though one is an inch bigger in diameter. In my example, 225 is the tire width, 45 or 40 is the aspect ratio, or sidewall height, and 17/18 is the rim diameter. The width and aspect ratio are in millimeters, the rim is in inches. Multiply the width by the aspect ratio (225 x .45 = 101.25) to arrive at the sidewall height from the rim to the ground. You need the sidewall on two sides, so 101.25 x 2 = 202.5. Now you need to convert this to inches, so 202.5 / 25.4 = 7.972. Add this to the rim diameter, 7.972 + 17 = 25 (rounded) to get the circumference of the tire. If you do the same math on a 225/40x18, you will discover that the circumference is 25.086 inches (25 inches, rounded down). This gives us two identical tires with a different rim diameter.

You can repeat the formula substituting widths and aspect ratios to arrive at a circumference that is near enough to be good for the car. I don't know the pricing or availability, but with a 225/40x18 on the front, you can fit a 235/40, 245/40 or 245/35 onto an 18-inch rim. In a perfect world, you would want the rear tires to be slightly larger than the front, else the traction control might falsely detect that the rear tires are spinning free, and activate the the systems that halt such behaviors. DSC, Traction Control, detect tire spin when the rear tires are going faster than the front, and the brakes are applied and throttle is cut to prevent this from happening. DSC Default is to be ON, so you have to turn the feature off each time you start the car, or disable the feature by removing a fuse, or prevent it from kicking in in error by selecting a rear tire that is not smaller in circumference than the front tires.

The spacers, if needed will be because the inside shoulder of the tire might rub on the suspension. You should be okay with the wheels you are considering.
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Old 04-21-2017, 01:21 PM   #6
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I have a staggered set of BMW E90 Style 286's on with no issues at all.
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Old 04-21-2017, 01:56 PM   #7
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The fronts will fit.. barely.
I am running 18x8.5" ET40 and it clears the struts by less than a pinky width.

Rears, I have no idea how much room is available, but those are really wide and will be heavy.
I'd really reconsider, and get yourself a decent SQUARE setup in either 18x8 or 18x8.5 all around.

Don't go with black wheels. You'll look like a teenage ricer.
Most BMW enthusiasts will look down on you.

Last edited by GhostFlame; 04-21-2017 at 01:57 PM.
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Old 04-21-2017, 06:00 PM   #8
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Im running 18x9 ET 42 all arround with 255/35 PSS tires, no issues with mine. Lowered on H&R sports and koni yellows
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