[nickm7]

Originally Posted by snj49er

The profile is a percentage of tread width, so if the tire gets wider, the sidewall and diameter also grows. The overall tire diameters on the 2 sizes you mentioned are 25.5" and 26.3"...3% different. The OEM tire diameter is 26" +/-. 235/40-19 and 265/35-19 are almost identical at around 26.3".

You can see how this works with any tire calculator: http://www.e90post.com/forums/forumdisplay.php?f=12

OH! Okay, I was not aware that the profile is a percentage of the tread with and that the rolling diameter grew with the width of the tire. Very insightful.

Therefore that's why my 235/35/19 F and 265/30/19 R is messing with the xDrive. So now I'm stuck with 4 Continental DWS in the wrong sizes. FML

[snj49er]

Originally Posted by nickm7

Therefore that's why my 235/35/19 F and 265/30/19 R is messing with the xDrive. So now I'm stuck with 4 Continental DWS in the wrong sizes. FML

235/35-19 and 265/30-19 are close in size...within 0.7%. But your post that I replied to said "This may sound stupid, but can I run same profile tires on a staggered set up to eliminate the xDrive issues? Say 235/35/19 front and 265/35/19 rear?" Those diameters are more than 3% different.

Don't know if your car is lowered or you have plans to do that. But 235/35-19 is a half inch smaller in diameter than the OEM setup which will increase the already generous gap between your tire and fender. 245/35-19 is a tick smaller in diameter than the 225/40-19 stock tire and 235/40-19 is (obviously) a bit larger.

Check out the comparison between the 2nd and 3rd pic in this thread: http://f30.bimmerpost.com/forums/sho....php?t=1031765 As the car was lowered in the 3rd shot, the xDrive with 235/35-19 fronts and 265/30-19 rears was transformed from a piece of agricultural equipment to a Tomahawk missile...OK, maybe the tire dressing helped a little bit. Bottom line, I'd be reluctant to pick 25.5" tires for an xDrive unless I had plans to lower it. A half inch doesn't sound like much, but in the context of wheels and tires, it's a pretty big change to make inadvertently.

Whatever the case, if you are seeing your traction control light regularly, something needs to be sorted out. Let us know how things progress...

[nickm7]

Originally Posted by snj49er

235/35-19 and 265/30-19 are close in size...within 0.7%. But your post that I replied to said "This may sound stupid, but can I run same profile tires on a staggered set up to eliminate the xDrive issues? Say 235/35/19 front and 265/35/19 rear?" Those diameters are more than 3% different.

Don't know if your car is lowered or you have plans to do that. But 235/35-19 is a half inch smaller in diameter than the OEM setup which will increase the already generous gap between your tire and fender. 245/35-19 is a tick smaller in diameter than the 225/40-19 stock tire and 235/40-19 is (obviously) a bit larger.

Check out the comparison between the 2nd and 3rd pic in this thread: http://f30.bimmerpost.com/forums/sho....php?t=1031765 As the car was lowered in the 3rd shot, the xDrive with 235/35-19 fronts and 265/30-19 rears was transformed from a piece of agricultural equipment to a Tomahawk missile...OK, maybe the tire dressing helped a little bit. Bottom line, I'd be reluctant to pick 25.5" tires for an xDrive unless I had plans to lower it. A half inch doesn't sound like much, but in the context of wheels and tires, it's a pretty big change to make inadvertently.

Whatever the case, if you are seeing your traction control light regularly, something needs to be sorted out. Let us know how things progress...

Wow thanks for the great wealth of info. I'll definitely give that calculator a shot. Does the offset matter other than the fitment/clearance?

I do plan in dropping the car, that's my next little project as soon as I sort of this issue with the tires.

So according to your post and the numbers you ran on the calculator, I can keep my rear 265/30/19 and just get 235/35/19 (currently have 245/35/19 front and its jerking) and I should be okay so that way I would need to get only two new tires...

[snj49er]

You might want to take a look at this calculator which is more visual and provides a broader range of information: http://rimsntires.com/specspro.jsp The offset has no effect on the relationship between the tire and the wheel, but it has everything to do with how your wheel fits (or doesn't) in the wheel well.

You should be fine with 235/35-19 and 265/30-19 which are within 0.7%. That's the same sizes in the link to the BSM xDrive that I sent to you earlier.

The other thing you could do is keep the 245/35-19 fronts and go with 275/30-19 rears which are within 0.8%.

http://f30.bimmerpost.com/forums/sho...ght=275%2F30#2

FWIW, these are a bit closer to the diameter of the OEM tire and will be a little less stretched on an 8.5" wheel...if that's what you have. They'll also keep your wheels a few mm further away from the next pothole. Post some pics when you're done...

Originally Posted by nickm7

Wow thanks for the great wealth of info. I'll definitely give that calculator a shot. Does the offset matter other than the fitment/clearance?

I do plan in dropping the car, that's my next little project as soon as I sort of this issue with the tires.

So according to your post and the numbers you ran on the calculator, I can keep my rear 265/30/19 and just get 235/35/19 (currently have 245/35/19 front and its jerking) and I should be okay so that way I would need to get only two new tires...

[WWM3]

Originally Posted by snj49er

You might want to take a look at this calculator which is more visual and provides a broader range of information: http://rimsntires.com/specspro.jsp The offset has no effect on the relationship between the tire and the wheel, but it has everything to do with how your wheel fits (or doesn't) in the wheel well.

You should be fine with 235/35-19 and 265/30-19 which are within 0.7%. That's the same sizes in the link to the BSM xDrive that I sent to you earlier.

The other thing you could do is keep the 245/35-19 fronts and go with 275/30-19 rears which are within 0.8%.

http://f30.bimmerpost.com/forums/sho...ght=275%2F30#2


FWIW, these are a bit closer to the diameter of the OEM tire and will be a little less stretched on an 8.5" wheel...if that's what you have. They'll also keep your wheels a few mm further away from the next pothole. Post some pics when you're done...

Thanks for the info you've provided in this thread!

I have an xDrive F32 on order and I was thinking of ordering those same apex wheels in the link you attached above. I'm also going to lower with Dinan springs and bump stops. Would you recommend 245/35/19 & 275/30/19 or 235/35/19 and 265/30/19? Thanks!

[nickm7]

Originally Posted by snj49er

You might want to take a look at this calculator which is more visual and provides a broader range of information: http://rimsntires.com/specspro.jsp The offset has no effect on the relationship between the tire and the wheel, but it has everything to do with how your wheel fits (or doesn't) in the wheel well.

You should be fine with 235/35-19 and 265/30-19 which are within 0.7%. That's the same sizes in the link to the BSM xDrive that I sent to you earlier.

The other thing you could do is keep the 245/35-19 fronts and go with 275/30-19 rears which are within 0.8%.

http://f30.bimmerpost.com/forums/sho...ght=275%2F30#2

FWIW, these are a bit closer to the diameter of the OEM tire and will be a little less stretched on an 8.5" wheel...if that's what you have. They'll also keep your wheels a few mm further away from the next pothole. Post some pics when you're done...

Okay awesome! What I think I'll do is replace the 2 front 245/35/19 and go with 235/35/19 since those will be easier to sell than my rear ones.

Thanks so much for all your help, I'll them up some pictures when I get home later tonight, and as of now:
Selling 2 Continental ExtremeContact DWS 245/35/19 LESS THAN 150 miles on them.

[snj49er]

I have the Apex EC-7's in 19x8.5 square with 245/35. I happen to prefer the slightly more meaty 245's on an 8.5" wheel. But take that with a grain of salt since I have grandchildren that are older than some forum members...in a few cases, a lot older! 245/35-19 has a sidewall that's only 4mm shorter than the OEM 225/40-19, so it's not a big hit to the quality of the ride. If you love a slightly more stretched tire and minimal sidewall, I'd say go with the 235's. They're more than a half inch smaller in diameter than the stock wheel.

Yes, that is a handicapped spot...I am not responsible.

Originally Posted by WWM3

Thanks for the info you've provided in this thread!

I have an xDrive F32 on order and I was thinking of ordering those same apex wheels in the link you attached above. I'm also going to lower with Dinan springs and bump stops. Would you recommend 245/35/19 & 275/30/19 or 235/35/19 and 275/30/19? Thanks!

[WWM3]

Originally Posted by snj49er

I have the Apex EC-7's in 19x8.5 square with 245/35. I happen to prefer the slightly more meaty 245's on an 8.5" wheel. But take that with a grain of salt since I have grandchildren that are older than some forum members...in a few cases, a lot older! 245/35-19 has a sidewall that's only 4mm shorter than the OEM 225/40-19, so it's not a big hit to the quality of the ride. If you love a slightly more stretched tire and minimal sidewall, I'd say go with the 235's. They're more than a half inch smaller in diameter than the stock wheel.

Yes, that is a handicapped spot...I am not responsible.

Thanks for the info.

Your car looks great. How do you like the square setup? What suspension are you running ?

[snj49er]

Thanks, I'm running KW Street Comfort coilovers. The wheels and suspension happened within days, so I'm not able to separate the effect of one from the other. I can say that the combination is a big improvement over the non-DHP xDrive.

Originally Posted by WWM3

Thanks for the info.

Your car looks great. How do you like the square setup? What suspension are you running ?

[nickm7]

Originally Posted by snj49er

You might want to take a look at this calculator which is more visual and provides a broader range of information: http://rimsntires.com/specspro.jsp The offset has no effect on the relationship between the tire and the wheel, but it has everything to do with how your wheel fits (or doesn't) in the wheel well.

You should be fine with 235/35-19 and 265/30-19 which are within 0.7%. That's the same sizes in the link to the BSM xDrive that I sent to you earlier.

The other thing you could do is keep the 245/35-19 fronts and go with 275/30-19 rears which are within 0.8%.

http://f30.bimmerpost.com/forums/sho...ght=275%2F30#2


FWIW, these are a bit closer to the diameter of the OEM tire and will be a little less stretched on an 8.5" wheel...if that's what you have. They'll also keep your wheels a few mm further away from the next pothole. Post some pics when you're done...

Got a local Craigslist buyer for my rears! Looks like I'll do the 275/30/19 rear which will look better on my 9.5" wheel! Just for reference sake, what percentage difference am I in now with the mounted 245/35/19 and 265/30/19?

[snj49er]

OK, I'm confused. Over your last few posts, you've mentioned 3 different F/R combinations. If you actually have 245/35-19 and 265/30-19 on the car, they're 1.8% different in diameter...25.8" vs. 25.3".

In the realm of mistakes with German cars, you're probably getting off pretty easy.

Originally Posted by nickm7

This may sound stupid, but can I run same profile tires on a staggered set up to eliminate the xDrive issues?
Say 235/35/19 front and 265/35/19 rear?
How does a wider rim affect the xDrive system?

Originally Posted by nickm7

Therefore that's why my 235/35/19 F and 265/30/19 R is messing with the xDrive. So now I'm stuck with 4 Continental DWS in the wrong sizes. FML

Originally Posted by nickm7

Just for reference sake, what percentage difference am I in now with the mounted 245/35/19 and 265/30/19?

[nickm7]

Originally Posted by snj49er

OK, I'm confused. Over your last few posts, you've mentioned 3 different F/R combinations. If you actually have 245/35-19 and 265/30-19 on the car, they're 1.8% different in diameter...25.8" vs. 25.3".

In the realm of mistakes with German cars, you're probably getting off pretty easy.

Sorry. Typos! I am in fact running 245/35/19 and 265/30/19 and I'm getting jerkiness that's getting on my nerves and triggering the traction control light occasionally. (Rarely) Thats why I'm considering swapping my
2 rear or 2 fronts, but most likely rears to 275/30/19... I'm hoping that will eliminate all jerkiness... Opinions?

[snj49er]

Originally Posted by nickm7

Sorry. Typos! I am in fact running 245/35/19 and 265/30/19 and I'm getting jerkiness that's getting on my nerves and triggering the traction control light occasionally. (Rarely) Thats why I'm considering swapping my
2 rear or 2 fronts, but most likely rears to 275/30/19... I'm hoping that will eliminate all jerkiness... Opinions?

245/35-19 and 275/30-19 are within 0.8%. Couldn't swear that a mismatch in tire sizes is the cause of your symptoms, but it sounds like a good place to start.

[nickm7]

Originally Posted by snj49er

245/35-19 and 275/30-19 are within 0.8%. Couldn't swear that a mismatch in tire sizes is the cause of your symptoms, but it sounds like a good place to start.

A week prior to, when I had the stock square set up 225/35/17 this issue didn't exist, wheel and tire size is the only thing that changed.

[snj49er]

Sounds like reasonable logic...hope that turns out to be the case!

I'm guessing that you had 225/50-17's originally rather than 225/35-17. If you really are dyslexic, you might want to try to distance yourself from most decisions involving wheel and tire fitment.

Originally Posted by nickm7

A week prior to, when I had the stock square set up 225/35/17 this issue didn't exist, wheel and tire size is the only thing that changed.

[nickm7]

Originally Posted by snj49er

Sounds like reasonable logic...hope that turns out to be the case!

I'm guessing that you had 225/50-17's originally rather than 225/35-17. If you really are dyslexic, you might want to try to distance yourself from most decisions involving wheel and tire fitment.

GOOD ONE. But I did in fact have 225/35/17 on the 396 type wheel.

[snj49er]

I'm beginning to think that you're just making this up as you go. 225/35-17 tires are nearly 3" smaller in diameter than the 26" OEM size. The wheel gap on an xDrive must have been epic!

But as far as I know, a 396 wheel is 18" and the 393 is 17". Forget numbers for a minute...do your wheels look like the 1st or 2nd picture? The tire sizes are written on them are bigger than life.

Originally Posted by nickm7

GOOD ONE. But I did in fact have 225/35/17 on the 396 type wheel.

[ska///235i]

Guys, for a square setup of 18x8....whats the best offset for the f36 (should be same or close to f30)? I dont need too aggresive but I dont want too tug-in either

[snj49er]

The F30 and F36 share at least the 400 and 442 style wheels, so the offset appears compatible between the two. The square 400 18x8 wheels are ET34 and the 442 19x8 fronts are ET36. But it seems that a lot of people have added 10mm +/- spacers to the OEM setup. An 8" wheel with an offset of ~25-30 would put you in a similar place.

Originally Posted by ska///235i

Guys, for a square setup of 18x8....whats the best offset for the f36 (should be same or close to f30)? I dont need too aggresive but I dont want too tug-in either

[nickm7]

That's the wheel but I swear it's a 17!

I'll take a picture when I get home

[nickm7]

Originally Posted by snj49er

I'm beginning to think that you're just making this up as you go. 225/35-17 tires are nearly 3" smaller in diameter than the 26" OEM size. The wheel gap on an xDrive must have been epic!

But as far as I know, a 396 wheel is 18" and the 393 is 17". Forget numbers for a minute...do your wheels look like the 1st or 2nd picture? The tire sizes are written on them are bigger than life.

You won't believe this... Okay you probably will. There're 18's! Lol
I previously owned an E92 xDrive that was 17's and I thought for sure they were identical.

[jjc4scab]

Originally Posted by nickm7

You won't believe this... Okay you probably will. There're 18's! Lol
I previously owned an E92 xDrive that was 17's and I thought for sure they were identical.