12-19-2018, 07:00 AM | #1 |
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Change From Staggered to Square Tire/Wheel Setup
I have an M Sport staggered tire/wheel setup on my 2015 35i X3. 245/45 R19 front and 275/40 R19 rear. I'm looking to go to a square configuration. Has anyone done the larger setup using the 275/40 R19s on the 9.5" wheels all around? If so, what are your impressions as to improved or degraded handling? Are there fitment issues with front tires rubbing the fender liner?
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12-19-2018, 09:01 AM | #2 |
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275 is too wide. They'll run colder, use more fuel, and heavier on the suspension hurting handling and ride quality like slower/lazy turn in, etc. There's no benefit to a tire that big on the X3.
245/45-19 is perfect for the X3 on all 4 corners. Getting rid of the staggered will help with understeer as well. Throw on a set of nice summer performance non-runflat tires and it'll drive like a totally different machine. |
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12-19-2018, 09:54 AM | #3 | |
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12-19-2018, 10:37 AM | #4 | |
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12-19-2018, 01:20 PM | #5 |
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OP, what handling goals are you trying to achieve with squaring the tires out? Getting fatter fronts is only going to make this car understeer more, so I'm not sure it's going to accomplish what you're setting out to achieve.
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12-19-2018, 01:47 PM | #6 |
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Not being able to rotate tires is chewing up the fronts at a faster pace than the rears (Berthoud Pass is tough on them). I'd like to go to a square setup to enable rotation. I have a set of non-run flat snow tires/wheels in a square 245/45/19 configuration and experience a bit of under steer. Don't know if that's a result of tires only, square configuration, or both. Hence my question concerning the bigger meats. I recognize that a performance tire and more un-sprung weight will affect handling characteristics, so I'm just trying to get the benefit of other folks experience.
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12-19-2018, 02:31 PM | #7 |
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That is incorrect... square set-up will definitely reduce understeer in xDrive scenario. In-return a square set-up will create a neutral handling car.
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12-19-2018, 08:36 PM | #8 | |
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Basically, you'll pay out the ass to square up fat tires, so stick with the stock 19 size and then work out the understeer from there. I can't see it being easier to tune this stuff out when you have fat rubber everywhere. By the way, do you have uneven inner/outer tire wear due to the slight camber that these cars have? I'm trying to figure out how to deal with that properly. |
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12-20-2018, 10:52 PM | #10 | |
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this is a 4000lb vehicle, it can absolutely handle a 275 size tire. I have no idea how you would burn more fuel. More grip does not equal heavier steering ... blah blah. I lost 20lbs a corner going with 19s in a 275 tire from the 20" stockers I personally have run a 295/30 on 18x11" wheels on my 2600lb race car for years. Why ? It's called wider contact patch or scrub radius. I prefer rotating tires, so huge benefit there for me. ( I drive 30-40k miles a year) I agree it will feel like a better drive as well as understeer refuction.
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12-21-2018, 06:45 AM | #11 | |
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12-21-2018, 08:59 AM | #12 | |
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12-26-2018, 03:19 PM | #13 | |
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You are correct. Most people don't realize that changing tire width while keeping diameter the same does not increase the size of the contact patch on the tire and hence will not increase rolling resistance. However going wider in the front can cause issues with aerodynamics if the tire sticks too far outside of the body and will create more drag. I too am thinking of going with 275's all around on my 14 Msport. I am thinking of doing 275 40 20 on 20x10 wheels. Thinking of a 35 offset, anyone know if that will fit? |
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12-27-2018, 01:18 PM | #14 |
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How often are you guys breaking traction with 245 wide wheels on these cars? I don't understand the need for fatter tires unless you're struggling to put the power down. I'm on a stage 2 tune and I still hook on Toyo proxes.
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12-27-2018, 02:53 PM | #15 | |
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12-27-2018, 03:27 PM | #16 |
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I mean, you need tires for braking as well as cornering? Upsizing doesn't have a singular effect. I personally went down .5" in the rear in width. It's just personal choices and I know exactly why I went the direction I did.
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12-27-2018, 03:29 PM | #17 | ||
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12-27-2018, 03:48 PM | #18 |
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Found this one on F25 Facebook group
Tires: 285:45 20 Wheels: 20x10 ET unknown
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12-27-2018, 05:25 PM | #20 |
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12-27-2018, 05:41 PM | #21 |
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I've received many replies to my original post...thanks to all. And, along with some additional research, I've decided to go with the 245/45/19 square configuration when the current staggered set gives it up. The car isn't tracked but is driven on a spirited basis with some regularity. For that type of driving there seems to be no significant upside to going with the larger 275/40/19 square setup.
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12-27-2018, 07:20 PM | #22 | |
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Here are 3 tires 245,255,265 all 40 profile. If you look at the specs, the ideal would be a 265 on a 9.5 to keep a nice square shoulder. If your going to have an 8.5" wheel then the 245 would be the better choice.
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