Bigger tires on stock 343 rims

hjs1971 · 07-07-2016, 12:03 PM

Anyone doing this? I want to go up a size (305) in the rear, I assume people have done this, wondering if there are any issues? It seems logical to up the fronts to 275's as well. Any problems running Michelins on the stock 20" rims with this set up?

quitethesnapper · 07-07-2016, 03:29 PM

I have Michelin PSS 305's on stock rear rims. don't touch the fronts.

speedracerlo · 07-07-2016, 09:25 PM

Plenty of people running 305s in the rear, even 315.
I have the wheel and tire coverage from BMW NA, so I have to stick to stock tire sizes. Or else I would totally go 305 rear.

M6-Coupe · 07-07-2016, 10:38 PM

305 on rear and 275 on front. No issue as long as you are running on M6 343M rims and not M5 343M

S800vxr · 07-08-2016, 04:53 PM

Quote:

Originally Posted by quitethesnapper

I have Michelin PSS 305's on stock rear rims. don't touch the fronts.

Why do you say that as I'm gonna replace all mine soon and want to up the fronts to give more rim protection.

devondragon · 07-08-2016, 06:02 PM

I have heard that increasing the foot print of the fronts creates very heavy steering due to the added grip. I have just ordered up new PSS 265/305 setup myself.

quitethesnapper · 07-10-2016, 12:29 PM

Quote:

Originally Posted by S800vxr

Quote:

Originally Posted by quitethesnapper

I have Michelin PSS 305's on stock rear rims. don't touch the fronts.

Why do you say that as I'm gonna replace all mine soon and want to up the fronts to give more rim protection.

changes the steering dynamic. personally I like how heavy the feel is with 265's.

melvyn · 07-10-2016, 01:26 PM

Anyone running 305s on the CP 601m, how do they fit on the 10.5 rim and do they offer better traction.

M6-Coupe · 07-10-2016, 09:31 PM

Quote:

Originally Posted by melvyn

Anyone running 305s on the CP 601m, how do they fit on the 10.5 rim and do they offer better traction.

601M have the same offset of 343M so basically it should be fine.
As far as traction, 305 tires have much better traction/grip in straight line but on corners they change the dynamic of car significantly.. you won't have that much fun in MDM mode either

melvyn · 07-10-2016, 10:17 PM

Quote:

Originally Posted by M6-Coupe

601M have the same offset of 343M so basically it should be fine.
As far as traction, 305 tires have much better traction/grip in straight line but on corners they change the dynamic of car significantly.. you won't have that much fun in MDM mode either

Thanks for that

Don't want to mess it up as I am finding it's a very capable car , mdm is perfect for me as it is and surprised at the slip it allows.Just had the power upgrade and suspension tune put into it,it really is an excellent ride for a heavy car.

07-07-2016, 12:03 PM	#1
hjs1971 Private First Class 4 Rep 149 Posts Drives: 2017 x5m, 2012 m6 convertible Join Date: May 2008 Location: Tampa, FL iTrader: (1)	Bigger tires on stock 343 rims Anyone doing this? I want to go up a size (305) in the rear, I assume people have done this, wondering if there are any issues? It seems logical to up the fronts to 275's as well. Any problems running Michelins on the stock 20" rims with this set up? __________________ 2013 Alpine White X5 3.5xdrive Daily driver. 2012 San Marino Blue Metallic M6 convertible with silver stone interior. No mods. Weekend cruiser.
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07-07-2016, 03:29 PM	#2
quitethesnapper bimmerlover 19 Rep 171 Posts Drives: the panzer Join Date: Nov 2008 Location: Toronto iTrader: (0)	I have Michelin PSS 305's on stock rear rims. don't touch the fronts.
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07-07-2016, 09:25 PM	#3
speedracerlo Captain 305 Rep 676 Posts Drives: 2015 M6 Gran Coupe Join Date: Oct 2011 Location: Downtown Los Angeles iTrader: (1) Garage List 2018 Porsche 971 Pa ... [0.00] 2015 BMW M6 Gran Coupe [10.00]	Plenty of people running 305s in the rear, even 315. I have the wheel and tire coverage from BMW NA, so I have to stick to stock tire sizes. Or else I would totally go 305 rear.
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07-07-2016, 10:38 PM	#4
M6-Coupe Major General 1125 Rep 6,066 Posts Drives: F92 M8 Join Date: Feb 2014 Location: Bay area iTrader: (0)	305 on rear and 275 on front. No issue as long as you are running on M6 343M rims and not M5 343M __________________ Current : 2020 F92 Black Sapphire M8 - ZF8 Gone : 2018 F80 Mineral Gray M3 - 6MT Gone : 2016 F82 Austin Yellow M4 - 6MT Gone : 2013 F13 Sakhir Orange M6 -7DCT Gone: 2013 F13 Alpine White 650i -ZF8
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07-08-2016, 06:02 PM	#6
devondragon Lieutenant 153 Rep 427 Posts Drives: 2019 M5 Competition Join Date: Oct 2011 Location: Boulder, CO iTrader: (0) Garage List 2014 BMW M6 Coupe [8.50]	I have heard that increasing the foot print of the fronts creates very heavy steering due to the added grip. I have just ordered up new PSS 265/305 setup myself.
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07-10-2016, 01:26 PM	#8
melvyn Lieutenant 267 Rep 436 Posts Drives: 2018 M3 CS Join Date: Jun 2011 Location: isle of man iTrader: (0)	Anyone running 305s on the CP 601m, how do they fit on the 10.5 rim and do they offer better traction.
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