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#1
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Should all 4 tires be exchanged at the same time in order not to destroy the transfer
X5 E53 2004 mod 3L diesel |
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#2
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Yes - it matters very much on xDrive.
It depends on the wear on the remaining two tyres and the overall rolling circumference. Ideally, to ensure you don't wear out your transfer case, you need the rolling circumference of all four wheels to be with about 1.5% (or less) of each other. Many tyres will change by more than 1.5% over the life time of the tyre, due to tread wear. Depends on the tread depth when new etc. You can calculate the variation using a calculator like this one. https://www.omnicalculator.com/math/circumference In most cases, you should be OK just replacing two tyres (same size and spec etc.) , as long as the other two are very similar in rolling circumference. YMMV... literally....
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
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Literally…awesome
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#4
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Should all 4 tires be exchanged at the same time in order not to destroy the transfer
I just looked up for somebody this situation and wo xdrive it's apparently ok to have 3% difference as the manual spec allows 285/45-19 and 255/55-19 on as well as 255/55-18 square.
Look in your manual and see what it has for stagger options and find what BMW actually says is ok for front to back difference and use the tire calculator.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) Last edited by andrewwynn; 10-08-2018 at 05:54 PM. |
#5
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Should all 4 tires be exchanged at the same time in order not to destroy the transfer
I actually would not recommend different traction on front v back axle. The traction control and stability control will assume traction of same tires and it could put you in a ditch if the math is thrown off from different tires front v back. That said BMW says to only put chains on the back when necessary so go figure. Read what the manual says.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#6
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Have placed different tire brands and old vs new on axles for over 17 years on 7 different AWD vehicles. Not one issue, ever. I did run a larger than recommended rear setup (5% difference) on my 4.4 years back and after 10 miles the entire vehicle would shake violently and I had to drive very slow back home, swapped them out for tires within spec, and all was fine for another 30k miles (sold at 196k). It will not unknowingly destroy your vehicle, you will know. I also ran my 4.4 off road for over 25k of those miles, never any traction issues, or other annomalies.
Not a single AWD vehicle I have owned has worn front/rear tires evenly. So, when the rears are worn, I will buy new rears. When the fronts are worn, I will buy new fronts. Generally, my preference is to buy all 4 if they are available at the same time, not always the case, and I never allow tires get under 40% tread, I buy new tires. I also drive more aggressively than average.
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E53 X5 4.8is-Dinan S2-Street Brawler E70 X5M-The stoplight shocker AMG E55K-539 RWHP, 629RWTQ-my toy GX470-the unbreakable truck. F30 328i-JB4 STG 2. Daily MPG Work Beater 02-WS6, 6sp my other toy ...other stuff parked around here somewhere Last edited by pearlpower; 10-12-2018 at 08:38 AM. |
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Funny that you said not one issue ever then the next sentence describes an issue you had. Helpful feedback though interesting it took 10 miles to piss off the computer. Might have been able to just disable DSC.
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#8
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They were size up tires, not recommended tire sizes, I should have stated that when I typed larger. Had nothing to do with the computer, it was the transfer case. It was also entertaining.......
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E53 X5 4.8is-Dinan S2-Street Brawler E70 X5M-The stoplight shocker AMG E55K-539 RWHP, 629RWTQ-my toy GX470-the unbreakable truck. F30 328i-JB4 STG 2. Daily MPG Work Beater 02-WS6, 6sp my other toy ...other stuff parked around here somewhere Last edited by pearlpower; 10-12-2018 at 10:33 PM. |
#9
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Quote:
The later facelift cars, fitted with the ATC500 transfer case, would possibly behave rather differently. The clutch packs in the ATC500, which provide the variable power dividing ratio (xDrive), could just simply slip but could also suffer accelerated wear due to this slippage. Or worse...
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#10
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Quote:
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E53 X5 4.8is-Dinan S2-Street Brawler E70 X5M-The stoplight shocker AMG E55K-539 RWHP, 629RWTQ-my toy GX470-the unbreakable truck. F30 328i-JB4 STG 2. Daily MPG Work Beater 02-WS6, 6sp my other toy ...other stuff parked around here somewhere |
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