Staggered Setup for Xdrive Question

Ickdeep · 08-22-2017, 03:40 PM

Hey guys,

I'm looking at getting staggered setup for my Xdrive but I'm wondering about the difference. From what I researched, if the rolling diameter is within a particular spec, its okay for the xdrive system; can someone please verify.

245/35/20
285/30/20

Thank you,

Walt White Coupe · 08-22-2017, 05:29 PM

The rule is less than 1% difference between front and back tires. 0.4% is within that limit. But I don't understand how both sizes can have 777 rev/mile with a difference in circumference.

wcr3d · 08-22-2017, 09:43 PM

That calculator math is incorrect.
Doing hand I get;
63360 inches per mile so...
63360/84=754.28
63360/83.9=755.18
Which is .904 inch per mile difference, which is well in the 1%.
You should be fine but I wouldn't trust that site.

08-22-2017, 03:40 PM	#1
Ickdeep Brigadier General 5727 Rep 4,209 Posts Drives: '13 F10 M5 \| '15 F15 X5 Join Date: Jul 2015 Location: Seattle, WA iTrader: (3) Garage List 2015 BMW X5 [10.00] 2013 BMW M5 [SOLD] [10.00] 2013 BMW 535i [SOLD] [10.00]	Staggered Setup for Xdrive Question Hey guys, I'm looking at getting staggered setup for my Xdrive but I'm wondering about the difference. From what I researched, if the rolling diameter is within a particular spec, its okay for the xdrive system; can someone please verify. 245/35/20 285/30/20 Thank you, Attached Images __________________ Stage 2 Tune BPM \| Fabworx DP \| SSP Performance Clutch \| Muffler & Resonator Delete Dinan Adjustable Springs \| Powder Coated 343 Wheels \| F&R Spacers \| RW Carbon Front Lip & Diffuser Sold!
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08-22-2017, 05:29 PM	#2
Walt White Coupe Captain 225 Rep 741 Posts Drives: 2013 650ix Coupe, 23 C8 Vette Join Date: Mar 2011 Location: Phila, PA iTrader: (0)	The rule is less than 1% difference between front and back tires. 0.4% is within that limit. But I don't understand how both sizes can have 777 rev/mile with a difference in circumference.
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08-22-2017, 09:43 PM	#3
wcr3d Captain 461 Rep 659 Posts Drives: 2013 535i XDrive M Sport Join Date: Aug 2012 Location: Indiana iTrader: (0)	That calculator math is incorrect. Doing hand I get; 63360 inches per mile so... 63360/84=754.28 63360/83.9=755.18 Which is .904 inch per mile difference, which is well in the 1%. You should be fine but I wouldn't trust that site.
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