06-02-2016, 11:21 AM | #1 |
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19x8.5 square set up, max tire widths question!
I know BMW shows 245 as recommended width. Anyone running 255/50r19?
Trying to put Michelin Premier LTXs on, and they are hard to come by in 245s. Recommendations on max width for all 4 corners. Thanks |
06-02-2016, 11:52 AM | #2 | |
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You can use this calculator to find compatible sizes. (OEM size is 245/45 19" or 275/40 19" rear on staggered setup, as you probably know ) https://tiresize.com/comparison/ |
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06-02-2016, 01:31 PM | #3 |
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As above, you will change the overall diameter of the fronts. If you have a square setup then a cautious yes, but on a staggered setup, a big no no.
You would ruin your transfer box Edit: just re read that you have a square setup. It would work if your swapping all 4 tyres, but it will change the overall gearing/speedo etc |
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06-03-2016, 02:11 AM | #5 |
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Which site is that calculator on? Very informative :-)
As long as all tyres are same size = same diameter, and the tread depth is within 2mm of each other, BMW say your transmission will be fine. I would go for it, if you can't get the tyres in the original size |
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06-03-2016, 10:59 AM | #7 |
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All,
Thanks for the help. It will be a square set up, with same tire sizes (brand new) and 4 19x8.5 wheels. just trying to decide between 255/50r19s or 245/55r19s, or even 245/50/r19, to find right balance with a good sidewall height, good contact patch, and good handling feel. For instance, will 255/50s feel sloppy compared to 245/55s? will 245/55s feel less grippy than the wider 255/50s? Subjective question i know, but since the 8.5 inch width of the wheel optimally matches up with a 245, just figured i'd get some others' perspectives. thanks |
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06-03-2016, 11:46 AM | #8 |
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How the heck did you come up with 255/50 based on an OEM size of 245/45/19? When you go up a wheel size / tire width, the profile ALWAYS has to drop, to maintain the same overall diameter of wheel and tire.
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06-03-2016, 01:16 PM | #9 |
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For best performance, you should buy tires that are STD on X4 M40i - they are 19" RFT.
However "everybody" choose optional 20" with Michelin Pilot Super Sport non-RFT:s - which are very good, but costs a packet, especially with rims. |
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06-04-2016, 06:08 PM | #10 | |
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As you said, this provides additional tire size/brand options for the X3!
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06-04-2016, 08:51 PM | #12 |
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Ha! I pulled info using the "size comparer" tool on www.rimsntires.com (and then copied/reformatted data in Excel).
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06-06-2016, 01:55 AM | #13 | |
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"When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure." http://www.1010tires.com/Tools/Tire-Size-Calculator |
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06-06-2016, 07:01 AM | #14 | |
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SOLD - 2013 X3 35i l BSM l MSport l DHP l Premium l Sound l Tech l CW/CWII l Apps l 35% Tint SOLD - 2010 E92 335 X-drive l BSM l MSport l Steptronic l Premium l CW l Logic 7 l Confort l Nav l KW-V1s l 35% Tint |
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06-06-2016, 01:35 PM | #15 | |
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Regardless, IMO you should have stated what I said at least since we're talking about a safety issue and potential damage to his car, if you're going to put your info out there to a noob who's looking for advice. I'm sure some of the disclaimer is related to liability mitigation and if the risks are just damage to your own car, then do as you wish, but if it was to truly cause brake issues, and cause an accident, then that's another story. |
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06-06-2016, 07:39 PM | #16 | |
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As I said, take a look around at number of jeeps/trucks/SUVs that are raised several inches over OEM height (yes, over 5%) with no change of suspension or change to the OEM braking system...and as far as I know, there are no NHTSA rules or laws against it...and they still seem to pass the annual State safety inspection (mine included). Perhaps its different in Canada (or wherever you are from)?
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06-07-2016, 01:30 PM | #17 | |
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I don't know how much clearer that warning from 1010tires can be... They keep referring to tire diameter. Not ride height... |
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06-07-2016, 06:59 PM | #18 |
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Point taken (and trust me, I completely understand but not sure you do). You cite something on a website...while I provide examples of how a minor change is not something that I am really concerned about for reasons already mentioned, which is quite the opposite. Recalibrate the speedometer and reprogram the ECU so car now knows dimensions of new tires/wheels. Whoala, problem solved. Time to move on (Op, you owe me big time)!
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06-10-2016, 06:02 PM | #19 |
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Bmw offers 310 m wheels with 245/40 r 20 and 275/35 r 20 and even offers 21 iinch rims as well. It's all about the circumference of the fronts compared to the rear. You also have to compare how they match compared to stock.
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06-10-2016, 06:19 PM | #20 |
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Jesus people... It's the Diameter Variance that matters. It's pretty straightforward and doesn't require guesswork as to what fits.
Just go to Tire Rack, put in your X3, and it shows you literally all the various tires that are the OEM diameter plus/minus a bit. And by a bit, I mean like 0.25% off. Not 5% off like suggested above. Below I've put a screen shot of it. And here's a link to the Tire Size calculator if you don't believe me, showing each one of those tires is pretty much identical to the OEM diameter, all the way up to the 21" size. I've taken the liberty to plug in the sizes for you even. http://www.1010tires.com/Tools/Tire-...0R20/245-35R21 If you're going to vary from these sizes, just make sure you're within a few % of the OEM diameter. It's that simple. . . . Last edited by Lotus99; 06-17-2016 at 05:36 PM.. |
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