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Great Plains & Rocky Mountains
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Old 09-28-2011, 02:22 PM   #12041
Rubenk
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I dont see how you would have a problem. If it caused a problem, then they wouldnt include a donut spare tire to use.
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Old 09-28-2011, 02:25 PM   #12042
330iZSP
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I dont see how you would have a problem. If it caused a problem, then they wouldnt include a donut spare tire to use.
I assume that the donut is the same size outter diameter as all the other tires. I mean a 255-35-18 is the same outside diameter as a 225-40-18. I really hope that they don't mess anything up. I'm soo pissed at myself for not realizing that they weren't the right tire size to begin with.
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Old 09-28-2011, 02:27 PM   #12043
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the first few posts in this thread had me on the floor. http://forum.e46fanatics.com/showthread.php?t=873323
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Old 09-28-2011, 02:30 PM   #12044
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Originally Posted by 330iZSP View Post
I assume that the donut is the same size outter diameter as all the other tires. I mean a 255-35-18 is the same outside diameter as a 225-40-18. I really hope that they don't mess anything up. I'm soo pissed at myself for not realizing that they weren't the right tire size to begin with.
None of the 3 are the same. I dont know the donut diameter though.



I'm using this calc btw...
http://www.1010tires.com/TireSizeCal...?action=submit
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Old 09-28-2011, 02:43 PM   #12045
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Originally Posted by Rubenk View Post
None of the 3 are the same. I dont know the donut diameter though.



I'm using this calc btw...
http://www.1010tires.com/TireSizeCal...?action=submit
You're right, none of them are exactly the same size. However, if you look at the difference between the revs per mile on each tire size the 225-45's show that they will rotate nearly 30 times less than the other two sizes. I'm hoping that this isn't enough to throw off the speed sensors.

EDIT: I do like that tire size calc though and will be using it for future references.
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Old 09-28-2011, 02:52 PM   #12046
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Thats true, not sure if it will affect it. Just throwing the data out there in case someone else can use it to tell you.
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Old 09-28-2011, 02:54 PM   #12047
330iZSP
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Thats true, not sure if it will affect it. Just throwing the data out there in case someone else can use it to tell you.
I appreciate it. I thought I had read somewhere that the sensors allow for 3% difference in outside diameter but I can't seem to find it anywhere again. If the 3% is correct these tires will cause an issue which will piss me off...
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Old 09-28-2011, 02:58 PM   #12048
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I appreciate it. I thought I had read somewhere that the sensors allow for 3% difference in outside diameter but I can't seem to find it anywhere again. If the 3% is correct these tires will cause an issue which will piss me off...
If its 3% you'll be fine. The 40's arent 3% different than the 45's.
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Old 09-28-2011, 03:05 PM   #12049
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If its 3% you'll be fine. The 40's arent 3% different than the 45's.
I thought that the 40 meant 40% of the 225mm of the width of the tire... If that's right then wouldn't 45 be 45% of the 255mm and 5% larger? I could be wrong and will be the first to admit it lol...
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Old 09-28-2011, 03:07 PM   #12050
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width wont matter. All that *should* matter is the outside diameter of a tire when it comes to a traction control or ABS system.
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Old 09-28-2011, 03:12 PM   #12051
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width wont matter. All that *should* matter is the outside diameter of a tire when it comes to a traction control or ABS system.
Well, yeah but the 40/45 would be the number for the aspect ratio for the height of the sidewall. The width doesn't change from 225-40 to 225-45. I'll just have to wait and see. The tires should be here in a few days.
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Old 09-28-2011, 03:19 PM   #12052
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You should be fine. People run snow tires up front with bigger sidewall all the time, correct? So how would you have a problem?
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Old 09-28-2011, 03:21 PM   #12053
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my snows are 235/45/17
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Old 09-28-2011, 03:28 PM   #12054
Rubenk
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You also have to consider that ACTUAL measured diameter/circumfrence of a tire is often much different than the advertised size of the tire.
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Old 09-28-2011, 03:31 PM   #12055
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You should be fine. People run snow tires up front with bigger sidewall all the time, correct? So how would you have a problem?
Aren't all four tires the same sidewall height though? I know my snow's are 225-45-17's but all four are that same size, which means that the front and rear speed sensors would be seeing the same amount of rotations. Right? The problem that I would be having is that my fronts would rotate 800 times in a mile while the rears would rotate 830 times in that same mile... I'm wondering if that is enough to throw off the speed sensors?
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Old 09-28-2011, 03:39 PM   #12056
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I think you'll be fine. But it will look weird.

There is no possible way to "take back" your bid?

I know the seller can cancel a bid, maybe just send him an email?

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Last edited by Andy2108; 09-28-2011 at 03:41 PM.
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Old 09-28-2011, 03:45 PM   #12057
330iZSP
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I think you'll be fine. But it will look weird.

There is no possible way to "take back" your bid?

I know the seller can cancel a bid, maybe just send him an email?
I sent him an email... Although I already sent paypal payment as well . I thought about offering to pay for his ebay fees if he'd cancel my bid but at this point I'm just goint to wait and see what he says about my first email.
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Old 09-28-2011, 04:26 PM   #12058
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This is where I read about the 3% tolerance...

http://forums.bimmerforums.com/forum....php?t=1456674

Can anyone confirm this?
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Old 09-28-2011, 04:47 PM   #12059
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Do I have to take the headlights out to change the HID bulbs?

My two front bulbs aren't even the same color so I just got some new ones in from jlevi
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Old 09-28-2011, 04:52 PM   #12060
330iZSP
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Do I have to take the headlights out to change the HID bulbs?

My two front bulbs aren't even the same color so I just got some new ones in from jlevi
I was able to get to my bulbs in my 330 without taking the headlight out. Just had to remove the intake and the washer fluid reservoir. I'm betting it might be a little different on your M3 though.
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