New custom staggered setup question

mwr1203 · 12-20-2021, 05:49 PM

I have a 2020 X3 M40i. Getting rid of the 21's and ordered 20's
Fronts 245/45ZR20 Wheels 20X9 Offset 25mm
Rears 275/40ZR20 Wheels 20X10.5 Offfset 40mm

I used a calculator I found online. It onlt says the scrub radius will be 5 mm positive on the fronts and 3 mm positive on the rears. Everything else came up that it would work. I just wanted some thoughts on this scrub radius???
Thanks

dkreidel · 12-20-2021, 06:06 PM

That's fine. Slightly positive promotes toe-in under load; you don't want toe-out (negative scrub radius) Dynamic toe should be about zero, which is just about perfect for the street.

mwr1203 · 12-20-2021, 06:09 PM

I appreciate the input. I was kinda hoping I didn't mess things up. I just couldn't see paying $500 per tire for the 21's

mwr1203 · 12-20-2021, 06:18 PM

Probably a stupid question, but should I have the alignment checked?

mwr1203 · 12-26-2021, 10:56 AM

https://1drv.ms/u/s!Aj-aMqQTtm61g-NSzkmMvah7q4DOKQ

P3NS · 12-26-2021, 01:50 PM

Looks great !

dkreidel · 12-26-2021, 02:52 PM

If you've never had the alignment checked, now would be a good time to do so. I've *NEVER* seen any of my 19 new BMW's come from the factory with the alignment in spec.

Ask for the "before and after" sheet showing all 4 wheels and thrust line. Dealership wont be cheap, but they generally do okay on alignment work and have the right equipment and specs.

Really nice looking X3!

marcati · 12-31-2021, 04:25 AM

definitely have the alignment checked. I didn't on mine and wore out a set of front tires in less than 13k miles. The morons at the tire shop didn't pay any attention to the fact I had spacers on. They paid to replace the left side, which for some reason was much worse than the right. Went back to BMW and paid them for a proper alignment.

12-20-2021, 05:49 PM	#1
mwr1203 New Member 14 Rep 17 Posts Drives: 2020 BMW 530i Join Date: Dec 2021 Location: 77355 iTrader: (0)	New custom staggered setup question I have a 2020 X3 M40i. Getting rid of the 21's and ordered 20's Fronts 245/45ZR20 Wheels 20X9 Offset 25mm Rears 275/40ZR20 Wheels 20X10.5 Offfset 40mm I used a calculator I found online. It onlt says the scrub radius will be 5 mm positive on the fronts and 3 mm positive on the rears. Everything else came up that it would work. I just wanted some thoughts on this scrub radius??? Thanks
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12-20-2021, 06:06 PM	#2
dkreidel Lieutenant 244 Rep 596 Posts Drives: a lot of BMW's Join Date: Oct 2009 Location: NW Montana iTrader: (0)	That's fine. Slightly positive promotes toe-in under load; you don't want toe-out (negative scrub radius) Dynamic toe should be about zero, which is just about perfect for the street. __________________ 2020 X3 M40 Alpine White over Cognac • 20" BBS CC-R • Cerium delete 2017 440xi Estoril over Saddle Brown • 6-speed • Every stinkin' option
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12-20-2021, 06:09 PM	#3
mwr1203 New Member 14 Rep 17 Posts Drives: 2020 BMW 530i Join Date: Dec 2021 Location: 77355 iTrader: (0)	I appreciate the input. I was kinda hoping I didn't mess things up. I just couldn't see paying $500 per tire for the 21's
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12-20-2021, 06:18 PM	#4
mwr1203 New Member 14 Rep 17 Posts Drives: 2020 BMW 530i Join Date: Dec 2021 Location: 77355 iTrader: (0)	Probably a stupid question, but should I have the alignment checked?
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12-26-2021, 10:56 AM	#5
mwr1203 New Member 14 Rep 17 Posts Drives: 2020 BMW 530i Join Date: Dec 2021 Location: 77355 iTrader: (0)	https://1drv.ms/u/s!Aj-aMqQTtm61g-NSzkmMvah7q4DOKQ
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12-26-2021, 01:50 PM	#6
P3NS Private First Class 239 Rep 197 Posts Drives: BMW X4 M40i Join Date: Dec 2021 Location: NYC iTrader: (0)	Looks great !
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12-26-2021, 02:52 PM	#7
dkreidel Lieutenant 244 Rep 596 Posts Drives: a lot of BMW's Join Date: Oct 2009 Location: NW Montana iTrader: (0)	If you've never had the alignment checked, now would be a good time to do so. I've NEVER seen any of my 19 new BMW's come from the factory with the alignment in spec. Ask for the "before and after" sheet showing all 4 wheels and thrust line. Dealership wont be cheap, but they generally do okay on alignment work and have the right equipment and specs. Really nice looking X3! __________________ 2020 X3 M40 Alpine White over Cognac • 20" BBS CC-R • Cerium delete 2017 440xi Estoril over Saddle Brown • 6-speed • Every stinkin' option
	Appreciate 0 Quote

12-31-2021, 04:25 AM	#8
marcati Banned 39 Rep 106 Posts Drives: BMW X4 Join Date: Feb 2019 Location: Thailand iTrader: (0)	definitely have the alignment checked. I didn't on mine and wore out a set of front tires in less than 13k miles. The morons at the tire shop didn't pay any attention to the fact I had spacers on. They paid to replace the left side, which for some reason was much worse than the right. Went back to BMW and paid them for a proper alignment.
	Appreciate 0 Quote