Tire size help

mrainv23 · 03-12-2015, 09:00 AM

I just purchased a set of wheels from need4speed. The tires they matched with the wheels are 265/30/21 Michelin pss in the front and 295/30/21 in the rear. The wheel/tire package and h&r springs are ready to ship. My potential concern is the rolling diameter and rubbing in the rear due to running 295/30/21 as opposed to 295/25/21. Should I be concerned or let them be shipped as is? They said they guarantee fitment and no rubbing on my f06.

HoustonRider · 03-12-2015, 02:15 PM

a 265/30/21 has the same rolling diameter and width of a 265/30/20, the only thing that changed is the sidewall height.

My OEM set up on my F06 is 265/35/20 Front and 295/30/20 Rear, I assume yours is the same.

height and width from 265/35/20 to 265/30/21 is the same

height from 295/30/20 to 295/30/21 is +1.0"
Width from 295/30/20 to 295/30/21 is the same

295/20/21 from 295/30/20 is shorter by like 0.2", width is the same

M6-Coupe · 03-12-2015, 03:07 PM

Your rear tire must be 295/25/21

jvise · 03-12-2015, 05:01 PM

I did a 305/25/21 with H&R springs. No rubbing whatsoever.

mrainv23 · 03-12-2015, 09:49 PM

Thx for the feedback. My main concern is the height, running a 30 profile as opposed to the common 25. My drop is suppose to be 1.2 inch in the rear post install.

Lydiamight · 03-13-2015, 07:29 AM

Run your tyre/wheels size numbers through this
http://www.rimsntires.com/specspro.jsp

Should give you the answer that you are looking for

mrainv23 · 03-13-2015, 01:59 PM

Thx for the help every one. Michelin pss 295/25/21 are on national back order. Changed to pirellis to get the correct size. 265/30/21 in front and 295/25/21 in the rear.

Palomequet · 03-14-2015, 06:17 PM

Quote:

Originally Posted by HoustonRider

a 265/30/21 has the same rolling diameter and width of a 265/30/20, the only thing that changed is the sidewall height.

My OEM set up on my F06 is 265/35/20 Front and 295/30/20 Rear, I assume yours is the same.

height and width from 265/35/20 to 265/30/21 is the same

height from 295/30/20 to 295/30/21 is +1.0"
Width from 295/30/20 to 295/30/21 is the same

295/20/21 from 295/30/20 is shorter by like 0.2", width is the same

What?

M6-Coupe · 03-14-2015, 09:02 PM

Quote:

Originally Posted by Palomequet

Quote:

Originally Posted by HoustonRider

a 265/30/21 has the same rolling diameter and width of a 265/35/20, the only thing that changed is the sidewall height.

My OEM set up on my F06 is 265/35/20 Front and 295/30/20 Rear, I assume yours is the same.

height and width from 265/35/20 to 265/30/21 is the same

height from 295/30/20 to 295/30/21 is +1.0"
Width from 295/30/20 to 295/30/21 is the same

295/20/21 from 295/30/20 is shorter by like 0.2", width is the same

What?

I just corrected it for you

M6-Coupe · 03-14-2015, 09:46 PM

Quote:

Originally Posted by mrainv23

Thx for the help every one. Michelin pss 295/25/21 are on national back order. Changed to pirellis to get the correct size. 265/30/21 in front and 295/25/21 in the rear.

Check these out for Michelin 295/25/21...
If you can change it, do it.... MPSS is much better tire

http://www.discountedwheelwarehouse....8747&pID=25656

http://www.tirerack.com/tires/tires....150315024448:s

03-12-2015, 09:00 AM	#1
mrainv23 mrainv23 30 Rep 224 Posts Drives: 2014 BMW M6 Gran Coupe F06 Join Date: Jan 2012 Location: Indianapolis iTrader: (0)	I just purchased a set of wheels from need4speed. The tires they matched with the wheels are 265/30/21 Michelin pss in the front and 295/30/21 in the rear. The wheel/tire package and h&r springs are ready to ship. My potential concern is the rolling diameter and rubbing in the rear due to running 295/30/21 as opposed to 295/25/21. Should I be concerned or let them be shipped as is? They said they guarantee fitment and no rubbing on my f06. __________________ 2014 BMW M6 Gran Coupe F06/M Performance Black Grille/20% Tint/ Exec Package/ Driver Assist Plus/ Black on Black Sold-BMW 550i F10/Dinan S3/ Eisenmann Race Exhaust/ Vossen CV3s
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03-12-2015, 02:15 PM	#2
HoustonRider big pimpin 38 Rep 327 Posts Drives: 2014 M6 GC and 2015 4 GC Join Date: Dec 2014 Location: Houston iTrader: (0)	a 265/30/21 has the same rolling diameter and width of a 265/30/20, the only thing that changed is the sidewall height. My OEM set up on my F06 is 265/35/20 Front and 295/30/20 Rear, I assume yours is the same. height and width from 265/35/20 to 265/30/21 is the same height from 295/30/20 to 295/30/21 is +1.0" Width from 295/30/20 to 295/30/21 is the same 295/20/21 from 295/30/20 is shorter by like 0.2", width is the same __________________ 2014 //M6 GC 2015 750Li 2015 435i GC
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03-12-2015, 03:07 PM	#3
M6-Coupe Major General 1125 Rep 6,066 Posts Drives: F92 M8 Join Date: Feb 2014 Location: Bay area iTrader: (0)	Your rear tire must be 295/25/21 __________________ 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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03-12-2015, 05:01 PM	#4
jvise Private 14 Rep 52 Posts Drives: 2013 BMW M6 Join Date: Aug 2014 Location: United States iTrader: (0)	I did a 305/25/21 with H&R springs. No rubbing whatsoever. Attached Images
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03-12-2015, 09:49 PM	#5
mrainv23 mrainv23 30 Rep 224 Posts Drives: 2014 BMW M6 Gran Coupe F06 Join Date: Jan 2012 Location: Indianapolis iTrader: (0)	Thx for the feedback. My main concern is the height, running a 30 profile as opposed to the common 25. My drop is suppose to be 1.2 inch in the rear post install. __________________ 2014 BMW M6 Gran Coupe F06/M Performance Black Grille/20% Tint/ Exec Package/ Driver Assist Plus/ Black on Black Sold-BMW 550i F10/Dinan S3/ Eisenmann Race Exhaust/ Vossen CV3s
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03-13-2015, 07:29 AM	#6
Lydiamight Private 2 Rep 68 Posts Drives: 640D Motorsport Convertible Join Date: Oct 2006 Location: Kent UK iTrader: (0)	Run your tyre/wheels size numbers through this http://www.rimsntires.com/specspro.jsp Should give you the answer that you are looking for
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03-13-2015, 01:59 PM	#7
mrainv23 mrainv23 30 Rep 224 Posts Drives: 2014 BMW M6 Gran Coupe F06 Join Date: Jan 2012 Location: Indianapolis iTrader: (0)	Thx for the help every one. Michelin pss 295/25/21 are on national back order. Changed to pirellis to get the correct size. 265/30/21 in front and 295/25/21 in the rear. __________________ 2014 BMW M6 Gran Coupe F06/M Performance Black Grille/20% Tint/ Exec Package/ Driver Assist Plus/ Black on Black Sold-BMW 550i F10/Dinan S3/ Eisenmann Race Exhaust/ Vossen CV3s
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