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View Full Version : Wheel Swap Possibilities??


Rufus330Ci
09-09-2002, 10:51 AM
Not that I'm getting sick of my wheels at all BUT I'd like to spend some money :D and swap wheels every couple weeks to keep my M68's clean. I was wondering if certain selections would work or are not possible without cutting/modifying suspension. My first idea was the wheels that HACK has which I think i very nice. Sorry I don't have the style number its in his current signature. I' pretty sure staying the same size and depth like that I wouldn't have to make any changes to the car. I've heard about camber and other changing parameters when changing wheel size. I was asking because I might like to bolt on something like the 18" 330 wheels or the 19" M3 wheels? Like I said I was just wondering. If going to a 18 or 19 requires geometry change to the suspension I don't plan on messing with that. In short what are my options when looking at a 18/19 on a 330Ci :angel:

Kaz
09-09-2002, 10:56 AM
Pretty much anything that fits on any E36 or E46 except for the rears off a E46M3 (and in your case 17" or bigger for a 330) will fit. M3 rears don't have enough offset.

Rufus330Ci
09-09-2002, 10:58 AM
So the 18 and 19" M3 wheels are a no go crap.........

Ben Chou
09-09-2002, 11:04 AM
Originally posted by Rufus330Ci
So the 18 and 19" M3 wheels are a no go crap.........

You can have the 18 and 19 inch M3 wheels but just have to use the front sizes on all four corners which is fine.

Rufus330Ci
09-09-2002, 11:08 AM
Ohhh, So I'd probably do 19" 225/40 up front and 245/35 in the rear. Has anyone done this or seen it done on a 330?? I was wondering about wheel well space and if the wheels looked like they were on an angle when looking at it from in front of it since it is a 2" difference.

Kaz
09-09-2002, 11:13 AM
Originally posted by Rufus330Ci
Ohhh, So I'd probably do 19" 225/40 up front and 245/35 in the rear. Has anyone done this or seen it done on a 330?? I was wondering about wheel well space and if the wheels looked like they were on an angle when looking at it from in front of it since it is a 2" difference.

I believe the proper size (and a size for which tires exist) is 235/35/19F and 265/30/19R if the rear wheels are sized properly (19x8.5 or x9 with high 40s offset). Most people seem to do 235/35/19 all the way around on 19x8.5, and you'd need at least a 40mm offset to keep that from rubbing up front.

Unless you lower/raise the suspension it will NOT affect camber.

Rufus330Ci
09-09-2002, 10:13 PM
Ok last question ;) What about the speedo will it be off then going from 17 to a 19" tire?? The final diameter will be alittle different I'm running 245/40 (I think) now.

Kaz
09-09-2002, 10:49 PM
Here, use this:

http://www.miata.net/garage/tirecalc.html

Rufus330Ci
09-10-2002, 08:06 AM
Thanks I used that if I go from 245/40/17 to 235/35/19 my speedo will say 60mph when I'm really doing 61.8mph. That isn't bad at all... Diameter goes from 24.7 to 25.5in. The speedometer is wired to calculate revolutions off the rear tires right?

johnlew
09-10-2002, 08:17 AM
Originally posted by Kaz
Here, use this:

http://www.miata.net/garage/tirecalc.html

Great link, thanks.:thumbup:

Rufus330Ci
09-10-2002, 09:03 AM
Does anyone have a picture of a 330Ci or any 3 series that isn't an M3 that has the 19's on it? If so can you please post it here. I was also wonder where you can buy the 19's other then turner and evosport. Thanks!

Ben Chou
09-10-2002, 09:18 AM
Originally posted by Rufus330Ci
Does anyone have a picture of a 330Ci or any 3 series that isn't an M3 that has the 19's on it? If so can you please post it here. I was also wonder where you can buy the 19's other then turner and evosport. Thanks!

Bekkers has the OEM 19 inch wheels for 629 in the size that you need.

19 inch Euro M3 wheel (http://bekkers.com/cgibin/shopper.cgi?preadd=Action&Key=newm3rim3&Reference=http://bekkers.com/category.php3?brrims)

Kaz
09-10-2002, 09:22 AM
Originally posted by Rufus330Ci
Thanks I used that if I go from 245/40/17 to 235/35/19 my speedo will say 60mph when I'm really doing 61.8mph. That isn't bad at all... Diameter goes from 24.7 to 25.5in. The speedometer is wired to calculate revolutions off the rear tires right?

The rule of thumb is to try and stay within 0.5in or so of the original tire diameter. This is a bit more but keep in mind that 245/40/17 is actually too SMALL to begin with (compare it to the fronts (225/45/17) You will be surprised).

Speedo on most modern BMWs is taken at the rear diff (see JonM's diffswap threads on the Z forum).

johnlew
09-10-2002, 09:28 AM
Originally posted by Kaz


The rule of thumb is to try and stay within 0.5in or so of the original tire diameter. This is a bit more but keep in mind that 245/40/17 is actually too SMALL to begin with (compare it to the fronts (225/45/17) You will be surprised).



I'm running into this issue with snows for the 540. My buddy has some (8) like new Blizzaks for $100 (for all) that are 215/60-16. I should have 215/55-16. Orig. are 235/45-17 I think buddy's tires are .7 in. wider., have to go recalculate. Haven't decided whether to take the chance with them or not.

Rufus330Ci
09-10-2002, 09:29 AM
Thats what I've been seeing 24-2600 bucks.

I have a couple favorites :O)

I love theses rims........mmm

Rufus330Ci
09-10-2002, 09:31 AM
I also like theses I think I can get theses for around 4k with tires.

Rufus330Ci
09-10-2002, 09:32 AM
If I could run a set of rear tires this big, I would be sleeping with this car :D

Rufus330Ci
09-10-2002, 09:33 AM
I really like theses M3 Mirrors two!

Rufus330Ci
09-10-2002, 09:36 AM
"http://bekkers.com/cgibin/shopper.cgi?preadd=Action&Key=newm3rim3&Reference=http://bekkers.com/category.php3?brrims"
Quote:
The new M3 has 8x18 inch rims with 225/45/18 tires up front and 9x18 inch rims with 255/40/18 tires on the rear axle. The 19" Euro-Only optional forged rims are now available at Bekkers Import. Front rim 8x19, rear rim 9,5x19. We recommend 245/35/19 front tires and 285/30/19 rear tires. The eight inch front rims 18" as well as 19" will fit perfectly front and back on the regular 3 Series E46 as well as 3 Series E36. The 47mm offset will allow plenty of clearance between the tire and the fender lip. The rear M3 rims have an offset of 26mm and do not fit anything but the new M3. Difference between the 19" and 18" rims: The 19" rims are forged aluminum versus 18" are cast aluminum. The 8x18 weighs 26.4lbs and the 8x19 weighs 26.9lbs. The 18" rims have a shadow chrome finish wich looks like a bright silver paint with clear coat and the 19" rim has a highly polished aluminum face which appears to have no coating and the recessed areas are painted in a charcoal grey metallic.

They say that you can run 285 out back on a 3 series is this because their using a bigger offset???

Ben Chou
09-10-2002, 09:38 AM
Originally posted by Rufus330Ci
"http://bekkers.com/cgibin/shopper.cgi?preadd=Action&Key=newm3rim3&Reference=http://bekkers.com/category.php3?brrims"
Quote:
They say that you can run 285 out back on a 3 series is this because their using a bigger offset???

This is true only if you have an M3. On a regular non-M E46, it will rub.

Rufus330Ci
09-10-2002, 09:42 AM
Oh yeah missed that part alittle below where it says 19's will fit E46 3 series kinda misleading :thumbup:

Ben Chou
09-10-2002, 09:43 AM
Originally posted by Rufus330Ci
Oh yeah missed that part alittle below where it says 19's will fit E46 3 series kinda misleading :thumbup:

The 19 and 18 will fit, just have to use the front wheel offsets on all four corners of you car.

Chipster
09-10-2002, 09:47 AM
Originally posted by Rufus330Ci
Ok last question ;) What about the speedo will it be off then going from 17 to a 19" tire?? The final diameter will be alittle different I'm running 245/40 (I think) now.


I read an interesting article on this the other day. The speedo being off is not the only concern. You also need to be concerned with the anti-lock breaks, the DSC/traction control and yaw sensor. If the wheel size is different from what the computer thinks it should be, the computer may not react like it should in a critical situation.

In other words the computer senses the wheel is spinning at xx MPH when in reality it's spinning at xx plus/minus the delta in tire size. The net result is that the computer compensates for the wheel at xx speed and may not react as it should for the actual situation.

Does that makes sense?!?

Rufus330Ci
09-10-2002, 09:59 AM
Yeah ;) in other words find a combination that is the exact same diameter........... crap

Kaz
09-10-2002, 10:03 AM
Originally posted by Chipster



I read an interesting article on this the other day. The speedo being off is not the only concern. You also need to be concerned with the anti-lock breaks, the DSC/traction control and yaw sensor. If the wheel size is different from what the computer thinks it should be, the computer may not react like it should in a critical situation.

In other words the computer senses the wheel is spinning at xx MPH when in reality it's spinning at xx plus/minus the delta in tire size. The net result is that the computer compensates for the wheel at xx speed and may not react as it should for the actual situation.

Does that makes sense?!?

This is more of an issue if all 4 tires are not the same size. If all 4 are the same diameter and within reasonable (i.e that 0.5in) diameter of the original, this shouldn't be an issue. Note that not all tires of the same size are the exact same diameter. It can vary by ~0.2in or so depending on design. Also, keep in mind that the tires on one end of the car could wear faster than the other (many of us have this issue) so these systems are set up to accomodate these kinds of conditions. Also consider the condition of running a donut spare.

I recall reading someting in Roundel where someone's E38 had 1 tire of a actual different size causing all sorts of havoc. Meaning yes, this is a real problem, but its not as sensitive as some may lead you to believe.