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The Tire Rack's Tire & Wheel Forum
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Old 12-10-2013, 08:10 PM   #1
imDerpz
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Wheel and Tire Question

I am considering buying vmr vb3's for my e46 which would be 18x8.5 in the front and 9.5 in the back. Since wheel has a bigger diameter what size tire would I need to get in order to not throw off the speedometer or is there a way to correct the speedometer to the new size? I heard somewhere that their is such thing as a speedo corrector but I am not familiar with this.

Also if I could get any critique on the wheel choice. I am open to any suggestions to other wheels since these were just an idea; nothing definite.

Thanks in advice for the help

Edit: sorry just realized this is posted in the wrong place
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Old 12-10-2013, 09:19 PM   #2
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Wheel and Tire Question

Tell you what. You can spend a fortune to attempt to offset your speedo which like most cars are often set off on purpose by around 5 mph over actual speed.

That or bust out your gps or phone with an app that can measure speed using gps. Then find out how fast you're really going relative I speedo. Make mental note. Done. That or take out your cluster and adjust the speedo needle to your liking
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Old 12-10-2013, 10:04 PM   #3
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Originally Posted by NumbaOneNewb View Post
Tell you what. You can spend a fortune to attempt to offset your speedo which like most cars are often set off on purpose by around 5 mph over actual speed.

That or bust out your gps or phone with an app that can measure speed using gps. Then find out how fast you're really going relative I speedo. Make mental note. Done. That or take out your cluster and adjust the speedo needle to your liking
If I just got thinner tires this would work also correct.


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Old 12-10-2013, 10:09 PM   #4
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front 225/40/18
rear 255/35/18
that is the correct sizing and was offered from bmw from the factory on the e46
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Old 12-10-2013, 10:15 PM   #5
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If I just got thinner tires this would work also correct.


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Yes, thinner as in lower profile.

As you're going up in wheel diameter, the tires you fit will be lower in profile, which will keep the overall tire diameter close to the same. Go to Tire Rack's website, look up a particular tire, and click on the "Specs" tab. For any given size, it will list the tire's diameter (a typical diameter for our cars might be 25.0 in.). Keep this dimension close to the original tire's diameter, and speedometer error will be minimized.

This is a general rule; sometimes a particular size will just look wrong, or rub. See what others have done with your wheels in terms of tire sizes and offsets, and talk to the experts about it (Tire Rack, or wheel manufacturer).
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Old 12-10-2013, 10:21 PM   #6
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Usualy, a staggered setup is not intended for awd cars.
But with that wheel size, Im running 225/40/18 front, 265/35/18 rear on a non awd drvetrain.
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Old 12-10-2013, 10:26 PM   #7
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Wheel and Tire Question

I believe mine right now is 8.5 width in back 7.5 in front even though AWD but I could be mistaken


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Old 12-10-2013, 11:20 PM   #8
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http://www.bmwstylewheels.com/bmw/79

Style 79: 7x17
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Old 12-11-2013, 12:05 AM   #9
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Usualy, a staggered setup is not intended for awd cars.
I agree with this. I wouldn't run a staggered tire setup with an AWD model. I would recommend a nice square setup. A friend of mine is running 255's on style 44's all around with his sedan. Even though thats exaggerated, you could easily run 245's all around if you wanted!
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Old 12-11-2013, 12:47 AM   #10
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Wheel and Tire Question

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I agree with this. I wouldn't run a staggered tire setup with an AWD model. I would recommend a nice square setup. A friend of mine is running 255's on style 44's all around with his sedan. Even though thats exaggerated, you could easily run 245's all around if you wanted!
255 is too wide for a 8 inch wheel. It won't actually offer any more grip than the suggested 225 despite popular belief.
Not because of the tire size itself but the overhang it will have on an 8 inch wheel.

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Old 12-11-2013, 12:51 AM   #11
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255 is too wide for a 8 inch wheel. It won't actually offer any more grip than the suggested 225 despite popular belief.
Not because of the tire size itself but the overhang it will have on an 8 inch wheel.

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Oh I completely agree... and I wouldn't run 255's on a style 44. But if the OP is getting a new set of wheels... say 8.5's all around, a 245 square tire setup would be nice.
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Old 12-11-2013, 12:56 AM   #12
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Wheel and Tire Question

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Oh I completely agree... and I wouldn't run 255's on a style 44. But if the OP is getting a new set of wheels... say 8.5's all around, a 245 square tire setup would be nice.
Depends on what he's looking for. 225 will be cheaper and will have his speedo set correctly.
But yeah 245 would be sweet. I would've chosen 235 on my autocross wheels (style 44) if they were available. The 225 re11s are FAT though. They look sweet and meaty.


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Old 12-11-2013, 07:10 AM   #13
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Wheel and Tire Question

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Originally Posted by peytonracer4 View Post
Depends on what he's looking for. 225 will be cheaper and will have his speedo set correctly.
But yeah 245 would be sweet. I would've chosen 235 on my autocross wheels (style 44) if they were available. The 225 re11s are FAT though. They look sweet and meaty.


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Thanks for the help. I will look at a square set up. That makes sense to me. Why don't they do that stock though on AWD?


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Old 12-11-2013, 08:20 AM   #14
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Thanks for that. Why would my rear tore pressure be higher then front though if they are all same size?


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Old 12-11-2013, 11:14 AM   #15
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Wheel and Tire Question

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Thanks for the help. I will look at a square set up. That makes sense to me. Why don't they do that stock though on AWD?


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Because on the x drive bmws, all the wheels need to be running at the same speed or it'll eat up the transfer case.
225/40/18 and 255/35/18 are very close in diameter. Close enough to where no one could ever tell. But they are not exactly the same. You'll never find two different tire sizes that will end up having the same overall diameter. So they technically run at different speeds.


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Old 12-11-2013, 01:48 PM   #16
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For an AWD model, it's best to do square wheel and tire fitment. However, if you are adamant about doing a staggered fitment for whatever reason, a 225/40/18 and 255/35/18 is your best combo. They're about .1" different in height between front and rear, which equates to about 2.54mm as a whole, or 1.27mm larger all around, which is nothing.
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Old 12-11-2013, 02:58 PM   #17
imDerpz
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For an AWD model, it's best to do square wheel and tire fitment. However, if you are adamant about doing a staggered fitment for whatever reason, a 225/40/18 and 255/35/18 is your best combo. They're about .1" different in height between front and rear, which equates to about 2.54mm as a whole, or 1.27mm larger all around, which is nothing.
I will probably do a square wheel fitment from what people said. I had though stock they were staggered so I was just going to keep with that but square wheel makes a lot more sense on AWD

Do you guys have a recommendation on a tire that would fit 18" vb3's and keep it close to overall dimensions of my current wheels. (17")


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Old 12-11-2013, 03:36 PM   #18
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Post your stock tire size & manufacturer and I'll help. Do you want a summer-only high-grip tire, or sporty all-season?

Also, are you planning to lower the car? Lower-profile tires tend to visually exaggerate the tire/fender gap, and lowering the car a bit makes it look "right" again.
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Old 12-11-2013, 05:52 PM   #19
imDerpz
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Originally Posted by bee-em-dougle-u View Post
Post your stock tire size & manufacturer and I'll help. Do you want a summer-only high-grip tire, or sporty all-season?

Also, are you planning to lower the car? Lower-profile tires tend to visually exaggerate the tire/fender gap, and lowering the car a bit makes it look "right" again.
I will get you those numbers when I get home. Thanks for willing to help.


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Old 12-11-2013, 07:07 PM   #20
imDerpz
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Originally Posted by bee-em-dougle-u View Post
Post your stock tire size & manufacturer and I'll help. Do you want a summer-only high-grip tire, or sporty all-season?

Also, are you planning to lower the car? Lower-profile tires tend to visually exaggerate the tire/fender gap, and lowering the car a bit makes it look "right" again.
Alrighty. I have Bridgestone Potenza RE97as which are a all season tire. Here is a link to them:

http://www.tirerack.com/tires/tires....=05WR7RE97ASXL

I would be looking for another all season tire. The measurements of my current tire is 205/50/17 and my wheels are Style 79 which are 17 by 7. Hope this is enough information to you. Thanks again for the help.
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