12-30-2020, 10:32 AM | #1 |
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Wheels and Tires...the craziest thing happened
Something crazy happened to me...and I figured I should share. I have a 2015 640IX GC . I purchased an aftermarket staggered set of tires and wheels from Discount Tire Direct. The tire setup is
2 ea. 255 35 R20 Front 2 ea. 285 30 R20 Rear The wheels looks great...and are TSW Max alloy 20X9 front and 20X10 rear. I drove on the Aftermarket setup for half 2019, in winter 2019, I changed to my OEM winter setup, then returned to the Aftermarket setup in April 2020. In September, I started experiencing an aggravating slight hiccup during acceleration, and the car felt really sluggish during regular driving. Researched online, nothing, the BMW dealer couldn't figure it...but indicated it could be my transfer case, or once they had a case where the wheel/tire setup caused issues. I figured my luck...it was the transfer case and started preparing for the heavy cost of repairing the transfer case. In mean time, winter kicked in and I went back to my winter OEM wheel/tire setup. Well, lo and behold, the hiccup and sluggishness completely disappeared. The car drives great...I almost forgot how smooth it was to drive. Question: Could it be the tires or the wheels...that caused the issues? Or perhaps because I'm using a staggered setup? I really love the wheels and I don't want to part with them. |
12-30-2020, 10:53 AM | #2 | ||
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12-30-2020, 09:44 PM | #3 | |
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2015 Bmw 650i xDrive Gran Coupe
M Sports Edition Carbon Wing Carbon Front Splitters Carbon Rear Diffuser Carbon Grilles Powder Coated 373m Triple Bronze CPG intakes Arm catless downpipes Arm charge pipes Custom Snow Performance methanol injection Custom exhaust, straight pipes to quad tips Bootmod3 Stage 2 3.5 Tmaps xHP Stage 3 |
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12-30-2020, 11:52 PM | #4 |
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Drives: 2014 bmw640gc 2015Mercedes e40
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Location: Philly - south Jersey area
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What happens if he changes the front set up to a 245 35 20 and keep the rears 285 30? This is the set up I'm running on my xi..unless my set up is wrong ? 😱
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12-31-2020, 01:28 PM | #5 |
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That's even worse lol. Your creating even a bigger diameter difference.
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2015 Bmw 650i xDrive Gran Coupe
M Sports Edition Carbon Wing Carbon Front Splitters Carbon Rear Diffuser Carbon Grilles Powder Coated 373m Triple Bronze CPG intakes Arm catless downpipes Arm charge pipes Custom Snow Performance methanol injection Custom exhaust, straight pipes to quad tips Bootmod3 Stage 2 3.5 Tmaps xHP Stage 3 |
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12-31-2020, 02:25 PM | #6 |
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Drives: 2014 bmw640gc 2015Mercedes e40
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Are you sure about this ?
Last edited by Bigjule1111; 12-31-2020 at 02:37 PM.. |
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12-31-2020, 03:05 PM | #7 |
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Stock staggered is any of these:
245/45r18 & 275/40r18 - circumference is 2129.1mm vs 2127.5mm 245/40r19 & 275/35r19 - circumference is 2131.9mm vs 2120.9mm 245/35r20 & 275/30r20 - circumference is 2134.7mm vs 2114.3mm The fun part is that 285/30r20 should actually be a better fit to the 245/35r20 front as it is 2133.1mm in circumference - closer than the stock option. So as to why there would be problems, I'm actually not sure here!
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12-31-2020, 03:23 PM | #8 | |
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2015 Bmw 650i xDrive Gran Coupe
M Sports Edition Carbon Wing Carbon Front Splitters Carbon Rear Diffuser Carbon Grilles Powder Coated 373m Triple Bronze CPG intakes Arm catless downpipes Arm charge pipes Custom Snow Performance methanol injection Custom exhaust, straight pipes to quad tips Bootmod3 Stage 2 3.5 Tmaps xHP Stage 3 |
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12-31-2020, 03:36 PM | #10 |
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There is a specific site to calculate this ratio, my Lexus and fell with in .03 so no problems. 1.0 or more , problems.Google. Will it fit?
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12-31-2020, 05:23 PM | #11 | |
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Yep this site is my go to.
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2015 Bmw 650i xDrive Gran Coupe
M Sports Edition Carbon Wing Carbon Front Splitters Carbon Rear Diffuser Carbon Grilles Powder Coated 373m Triple Bronze CPG intakes Arm catless downpipes Arm charge pipes Custom Snow Performance methanol injection Custom exhaust, straight pipes to quad tips Bootmod3 Stage 2 3.5 Tmaps xHP Stage 3 |
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05-19-2021, 03:31 AM | #13 |
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I experienced the same problems after changing my run flats to non run flats.
But the tyres I put were almost exact diameter so, apparently, that wasn't the cause of the issues. Besides, I put run flats back and it didn't fixed the problem. I changed the transfer actuator too, but nothing happened. I was thinking I had to repair or change the transfer but, in a last desperate try, I switch off the transfer for 24 h for a reset (I unplugged the connector under the car) and voila. No more jerking. If I had tried this first, I wouldn't have spent 500€ in an actuator (fortunately the tyre shop accepted the tyres change without cost because they accepted they put tyres not approved by bmw), and I would know if I can put nonrunflats. Now I don't dare to try the change again. It's obvious that the tyres change caused the issues but it's also true that the issue didn't disappear putting runflats back. So, maybe I could put nonrunflats just doing the reset just after the change. I would love to know. I loved the ride of the Michelins PS4 Sorry for my English |
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