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BMW 5-Series (G30) Forum Wheels | Tires | Suspension | Brakes | Chassis Replaced rear tires only x drive issue?

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      03-12-2020, 10:07 PM   #1
AddyDaddy
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Replaced rear tires only x drive issue?

I'm concerned that with 11,000 miles on my car and 6/32 tread on the front tires and just replaced both rears due to nails in them. Do I need to worry about burning up my transfer case with new tires in tears and fronts being smaller diameter than rears? Should I replace the fronts so I have 4 new tires?
I have the 20" staggered factory set up run flats.

I just feel like the car hesitates a touch if I use launch control or go full throttle from a stop. It could all be in my head but wanted to ask if anyone knew facts on this with our cars?

Thanks in advance
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      03-13-2020, 08:47 PM   #2
AddyDaddy
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I've read 3/32nds is acceptable difference. Stock fronts are 680 mm
Rears are 674 mm.
So maybe I'm ok with fronts being at 6/32nds and having new rears at 674mm. Still within the 1% variance I believe
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      03-14-2020, 07:26 PM   #3
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G30's with staggered rims don't have tires with the same circumference, so I wouldn't worry about it. Here's the 19's and 20's staggered front/rear the 540 xDrive:

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/40-19 3.9in 13.4in 26.7in 83.9in 755 0.0%
275/35-19 3.8in 13.3in 26.6in 83.5in 759 -0.5%

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/35-20 3.4in 13.4in 26.8in 84.0in 754 0.0%
275/30-20 3.2in 13.2in 26.5in 83.2in 761 -1.0%

Last edited by runbuh; 03-14-2020 at 07:31 PM..
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      03-15-2020, 07:34 PM   #4
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Quote:
Originally Posted by runbuh View Post
G30's with staggered rims don't have tires with the same circumference, so I wouldn't worry about it. Here's the 19's and 20's staggered front/rear the 540 xDrive:

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/40-19 3.9in 13.4in 26.7in 83.9in 755 0.0%
275/35-19 3.8in 13.3in 26.6in 83.5in 759 -0.5%

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/35-20 3.4in 13.4in 26.8in 84.0in 754 0.0%
275/30-20 3.2in 13.2in 26.5in 83.2in 761 -1.0%
Thanks was concerned but I bet now they are actually same circumferences now since fronts are worn 3/32nds down and rears are new .
Thanks for response
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