05-07-2015, 01:37 AM | #23 | |
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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 |
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05-07-2015, 08:55 AM | #24 | |
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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... |
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05-07-2015, 01:29 PM | #25 | |
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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... Last edited by nickm7; 05-07-2015 at 01:58 PM.. Reason: Bad numbers |
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05-07-2015, 03:20 PM | #26 | |
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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... Quote:
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05-07-2015, 03:31 PM | #27 | |
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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!
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Last edited by WWM3; 05-07-2015 at 08:24 PM.. |
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05-07-2015, 04:00 PM | #28 | |
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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. |
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05-07-2015, 04:32 PM | #29 | |
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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. Quote:
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05-07-2015, 04:42 PM | #30 | |
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Your car looks great. How do you like the square setup? What suspension are you running ?
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05-07-2015, 05:28 PM | #31 |
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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.
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05-07-2015, 09:33 PM | #32 | |
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05-07-2015, 10:04 PM | #33 | ||
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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. Quote:
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05-07-2015, 11:02 PM | #34 | |
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2 rear or 2 fronts, but most likely rears to 275/30/19... I'm hoping that will eliminate all jerkiness... Opinions? |
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05-08-2015, 05:34 AM | #35 | |
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05-08-2015, 07:55 AM | #36 |
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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.
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05-08-2015, 09:03 AM | #37 |
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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. |
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05-08-2015, 09:11 AM | #38 |
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GOOD ONE. But I did in fact have 225/35/17 on the 396 type wheel.
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05-08-2015, 10:17 AM | #39 |
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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. |
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05-08-2015, 10:39 AM | #40 |
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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
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05-08-2015, 12:05 PM | #41 |
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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.
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05-08-2015, 07:54 PM | #43 | |
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I previously owned an E92 xDrive that was 17's and I thought for sure they were identical. |
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05-09-2015, 07:06 AM | #44 | |
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