any issues w DSC/transmission with different tire sizes?

spikespiegel · 03-21-2018, 07:26 PM

looking to switch to 4s's and at 275 fronts and 305 rears; any issues with the software and change in tire sizes? Thanks!

mastatikle · 03-22-2018, 02:20 AM

It depends, you will have issues if there is a significant difference between the rear and front tire diameter. If they are not close enough together the car will not shift right or consistently.

Mr. M6 · 03-22-2018, 03:19 AM

i have 4s 265 front and 305 rear and no problem at all.

spikespiegel · 03-22-2018, 10:25 AM

Nice, thanks for posting Mr. M6.. Seems like 275 front would be fine too then since its a closer ratio..

gregmb · 03-22-2018, 04:34 PM

Quote:

Originally Posted by spikespiegel

looking to switch to 4s's and at 275 fronts and 305 rears; any issues with the software and change in tire sizes? Thanks!

I made the switch to those exact tires/sizes (4S plus 10 mm over stock width on factory 20" wheels) a couple months ago. Overall a positive - no issues no problems no errors no rubs - better traction with the rears hooking a bit better and slightly more sidewall protecting the wheels from curb rash if I happen to get too close. Will keeping running these sizes.

BMWDriverX · 03-22-2018, 06:08 PM

I was running 285/35 front and 315/30 rear with no issues except rubbing in the front. I replaced the front with a 265/35 and that fixed the rubbing, the 315/30 fixed the traction problems.

spikespiegel · 03-22-2018, 06:25 PM

jesus, you can run a 315!??

BMWDriverX · 03-22-2018, 06:36 PM

Quote:

Originally Posted by spikespiegel

jesus, you can run a 315!??

Easily on a 10.5" wheel. I would not go past 305 on a 20x10 and 315 max on a 10.5

People have been running those sizes on those widths for years and years without any issues, including myself.

spikespiegel · 04-12-2018, 04:19 PM

one more question: is it fine to use a 10mm spacer in F and R with 275F and 305R's??

gregmb · 04-13-2018, 11:18 AM

Quote:

Originally Posted by spikespiegel

one more question: is it fine to use a 10mm spacer in F and R with 275F and 305R's??

Presumably a 10 mm spacer on 275 front tires would be the equivalent to running a 285 size tire. As mentioned above, a 285 size in the front creates rubbing issues when turning.

03-21-2018, 07:26 PM	#1
spikespiegel Second Lieutenant 88 Rep 238 Posts Drives: BMW M6 comp Join Date: Dec 2016 Location: California iTrader: (0) Garage List 2019 Aprilia RSV4 [0.00] 2015 Land Rover Ran ... [0.00] 2014 MV Agust Rival ... [0.00] 2009 KLR650 [0.00] 2016 Kawasaki KX450F [7.50] 2016 BMW S1000RR [8.50] 2014 BMW M6 [8.00]	any issues w DSC/transmission with different tire sizes? looking to switch to 4s's and at 275 fronts and 305 rears; any issues with the software and change in tire sizes? Thanks!
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03-22-2018, 02:20 AM	#2
mastatikle Lieutenant 69 Rep 469 Posts Drives: m3 Join Date: Aug 2017 Location: CA iTrader: (0)	It depends, you will have issues if there is a significant difference between the rear and front tire diameter. If they are not close enough together the car will not shift right or consistently. Last edited by mastatikle; 03-22-2018 at 03:23 AM..
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03-22-2018, 03:19 AM	#3
Mr. M6 Lieutenant 149 Rep 477 Posts Drives: M6 Join Date: Jan 2018 Location: Bahrain iTrader: (0) Garage List 2014 BMW M6 F06 [9.25]	i have 4s 265 front and 305 rear and no problem at all. __________________
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03-22-2018, 10:25 AM	#4
spikespiegel Second Lieutenant 88 Rep 238 Posts Drives: BMW M6 comp Join Date: Dec 2016 Location: California iTrader: (0) Garage List 2019 Aprilia RSV4 [0.00] 2015 Land Rover Ran ... [0.00] 2014 MV Agust Rival ... [0.00] 2009 KLR650 [0.00] 2016 Kawasaki KX450F [7.50] 2016 BMW S1000RR [8.50] 2014 BMW M6 [8.00]	Nice, thanks for posting Mr. M6.. Seems like 275 front would be fine too then since its a closer ratio..
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03-22-2018, 06:08 PM	#6
BMWDriverX Captain 366 Rep 804 Posts Drives: G12 750i X-Drive Join Date: Jul 2017 Location: CA iTrader: (1)	I was running 285/35 front and 315/30 rear with no issues except rubbing in the front. I replaced the front with a 265/35 and that fixed the rubbing, the 315/30 fixed the traction problems.
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03-22-2018, 06:25 PM	#7
spikespiegel Second Lieutenant 88 Rep 238 Posts Drives: BMW M6 comp Join Date: Dec 2016 Location: California iTrader: (0) Garage List 2019 Aprilia RSV4 [0.00] 2015 Land Rover Ran ... [0.00] 2014 MV Agust Rival ... [0.00] 2009 KLR650 [0.00] 2016 Kawasaki KX450F [7.50] 2016 BMW S1000RR [8.50] 2014 BMW M6 [8.00]	jesus, you can run a 315!??
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04-12-2018, 04:19 PM	#9
spikespiegel Second Lieutenant 88 Rep 238 Posts Drives: BMW M6 comp Join Date: Dec 2016 Location: California iTrader: (0) Garage List 2019 Aprilia RSV4 [0.00] 2015 Land Rover Ran ... [0.00] 2014 MV Agust Rival ... [0.00] 2009 KLR650 [0.00] 2016 Kawasaki KX450F [7.50] 2016 BMW S1000RR [8.50] 2014 BMW M6 [8.00]	one more question: is it fine to use a 10mm spacer in F and R with 275F and 305R's??
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