Big rear tire guys: 315/25/21 or 325/25/21 ?

bizzmeister · 11-16-2022, 11:45 AM

Hey guys

Wheels should be coming in within 2 weeks or so. Going to need tires. What do you guys run yourself ?

Wheels will be 21x10 Front / 21x12 rear. Stock body, and will be on H&R race springs ( what pretty much everyone else runs lol )

I’m hearing 315/25/21 or 325/25/21’s will work just fine on a 12 inch rear wheel without body modification on the M6. I really wanted to go with a 30 series tire just to get a little more cushion but I’m hearing that’ll be pushing it. Was just looking for guys to post your setup or advice on this. Pictures directly from the rear of the car would be greatly appreciated too!

Thank you!

Atillathetom2 · 11-16-2022, 03:42 PM

What wheels? The 325 fitment will be based on offset. Do you want PS4? If so, they don't make a 315/25/.

What are the wheel offsets?

bizzmeister · 11-17-2022, 04:28 PM

Quote:

Originally Posted by Atillathetom2

What wheels? The 325 fitment will be based on offset. Do you want PS4? If so, they don't make a 315/25/.

What are the wheel offsets?

Richland Forged GT4 in brushed tint clear

21x10 +25 Front

21x12 +32 Rear

It will most probably be PS4’s, yes.

JDMSteven · 11-18-2022, 10:48 AM

Just my opinion but 20s are the way to go.

brad850csi · 11-18-2022, 12:09 PM

Hmm 32mm isn’t very aggressive for the rear, I’m running 325/30r20 on 20x11.5 18mm

atillathetom · 11-18-2022, 12:32 PM

Those Richland forged wheels might need a 10MM spacer if you run 325/25. That is the issue with the Richland 12" wheels...they are not flush and might rub on the interior. They had a 11.5" option that was flush but a 325 on their 11.5 might rub on the outside. I ultimately decided not to go their direction due to their lack of a great 325/25 option.

BLACK KILLER · 11-18-2022, 03:11 PM

Quote:

Originally Posted by bizzmeister

Richland Forged GT4 in brushed tint clear

21x10 +25 Front

21x12 +32 Rear

It will most probably be PS4’s, yes.

Weird offsets. I hope you did everything right.

my sizes: 255/30R21 ET12 and 325/25 ET19

PS: PS4 is complete garbage, if you want to run, take Conti 7.

I'm happy

bizzmeister · 11-18-2022, 08:12 PM

Quote:

Originally Posted by atillathetom

Those Richland forged wheels might need a 10MM spacer if you run 325/25. That is the issue with the Richland 12" wheels...they are not flush and might rub on the interior. They had a 11.5" option that was flush but a 325 on their 11.5 might rub on the outside. I ultimately decided not to go their direction due to their lack of a great 325/25 option.

Oh I am for sure going to need a 10MM spacer kit with extended studs. But yah, I hear ya on the tires. Literally like only 2 options, PS4 and some shirty pirelli. As least on tirerack.com I mean.

bizzmeister · 11-18-2022, 08:14 PM

Quote:

Originally Posted by BLACK KILLER

Weird offsets. I hope you did everything right.

my sizes: 255/30R21 ET12 and 325/25 ET19

PS: PS4 is complete garbage, if you want to run, take Conti 7.

I'm happy

Well this is what the guys @ Richland forged recommended. And I’ve seen it on the car and it looks amazing. I’ll post when I’m home.

Your car looks amazing to man. Share more pics please

atillathetom · 11-19-2022, 10:31 AM

Quote:

Originally Posted by bizzmeister

Well this is what the guys @ Richland forged recommended. And I’ve seen it on the car and it looks amazing. I’ll post when I’m home.

Your car looks amazing to man. Share more pics please

You have seen photos of a 325 on the car on Richland 21x12? Can you share?

bizzmeister · 11-19-2022, 08:55 PM

Quote:

Originally Posted by atillathetom

You have seen photos of a 325 on the car on Richland 21x12? Can you share?

Highly doubt its 325 but its the same offsets i shared that were custom ordered for me.

atillathetom · 11-19-2022, 09:25 PM

Quote:

Originally Posted by bizzmeister

Quote:

Originally Posted by atillathetom

You have seen photos of a 325 on the car on Richland 21x12? Can you share?

Highly doubt its 325 but its the same offsets i shared that were custom ordered for me.

IIRC that is 20x11 et 21 with a 305. Can you verify?

bizzmeister · 11-19-2022, 11:09 PM

Quote:

Originally Posted by atillathetom

IIRC that is 20x11 et 21 with a 305. Can you verify?

Unfortunately I can’t unless richlandforged comes in

brad850csi · 11-20-2022, 11:54 AM

Damn those wheels look good

When I got my wheels in 2019 I didn't know about Richland (or maybe the GT4 wheels weren't available then) but those wheels in 20" would be perfect imho at 20x10" 25mm, 20x11.5" 22mm.

I'm not convinced about their 21" rear option though. 11" is good for 305mm but they don't have a good option for 325mm in 21"

cpalacay · 11-21-2022, 08:08 AM

Quote:

Originally Posted by atillathetom

IIRC that is 20x11 et 21 with a 305. Can you verify?

I can verify, 21s on 305 PS4S.

bizzmeister · 11-21-2022, 11:15 AM

Quote:

Originally Posted by cpalacay

I can verify, 21s on 305 PS4S.

Is that your car bro? If so, beautiful!

Can you please share your full wheel/tire specs ?

atillathetom · 11-23-2022, 11:22 AM

IIRC there was a spacer included on those photos as well.

Rsnk60 M6 · 12-01-2022, 08:40 PM

325/25/21 fit perfect with no Spacers when I had mine .

bizzmeister · 12-02-2022, 10:42 PM

Nice! Thanks for sharing!

11-16-2022, 11:45 AM	#1
bizzmeister Private 10 Rep 68 Posts Drives: 2018 BMW M6 Gran Coupe Join Date: Apr 2021 Location: Los Angeles CA iTrader: (0)	Big rear tire guys: 315/25/21 or 325/25/21 ? Hey guys Wheels should be coming in within 2 weeks or so. Going to need tires. What do you guys run yourself ? Wheels will be 21x10 Front / 21x12 rear. Stock body, and will be on H&R race springs ( what pretty much everyone else runs lol ) I’m hearing 315/25/21 or 325/25/21’s will work just fine on a 12 inch rear wheel without body modification on the M6. I really wanted to go with a 30 series tire just to get a little more cushion but I’m hearing that’ll be pushing it. Was just looking for guys to post your setup or advice on this. Pictures directly from the rear of the car would be greatly appreciated too! Thank you! __________________ 2018 BMW M6 Gran Coupe /// Moonstone Metallic
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11-16-2022, 03:42 PM	#2
Atillathetom2 Registered 0 Rep 2 Posts Drives: m6 6mt Join Date: Nov 2022 Location: La Jolla, CA iTrader: (0)	What wheels? The 325 fitment will be based on offset. Do you want PS4? If so, they don't make a 315/25/. What are the wheel offsets?
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11-18-2022, 10:48 AM	#4
JDMSteven Captain 475 Rep 742 Posts Drives: '13 F13 M6, '94 JDM Supra 5MT Join Date: May 2018 Location: Ocala, Florida iTrader: (0) Garage List 2013 BMW M6 [10.00]	Just my opinion but 20s are the way to go. __________________ 2013 F13 ///M6 Alpine White • Zandvoort Full Merino Driving Assistance Pkg • Exec Pkg • Vent Seats Vorsteiner VFF-103 Carbon Graphite 343M dimensions • H&R Lowering Springs • Soul PP Resonated Muffler Delete • AeroFunction AF-1 Carbon Front Lip • Carbon Front Grilles • Carbon Mirror Caps • IND Black Fender Vents
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11-18-2022, 12:09 PM	#5
brad850csi Colonel 1316 Rep 2,349 Posts Drives: 16 F13 M6 Comp Join Date: Jan 2015 Location: Auckland, New Zealand iTrader: (0)	Hmm 32mm isn’t very aggressive for the rear, I’m running 325/30r20 on 20x11.5 18mm
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11-18-2022, 12:32 PM	#6
atillathetom Lieutenant 65 Rep 531 Posts Drives: Bike Join Date: Jun 2008 Location: San Diego iTrader: (0)	Those Richland forged wheels might need a 10MM spacer if you run 325/25. That is the issue with the Richland 12" wheels...they are not flush and might rub on the interior. They had a 11.5" option that was flush but a 325 on their 11.5 might rub on the outside. I ultimately decided not to go their direction due to their lack of a great 325/25 option.
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11-20-2022, 11:54 AM	#14
brad850csi Colonel 1316 Rep 2,349 Posts Drives: 16 F13 M6 Comp Join Date: Jan 2015 Location: Auckland, New Zealand iTrader: (0)	Damn those wheels look good When I got my wheels in 2019 I didn't know about Richland (or maybe the GT4 wheels weren't available then) but those wheels in 20" would be perfect imho at 20x10" 25mm, 20x11.5" 22mm. I'm not convinced about their 21" rear option though. 11" is good for 305mm but they don't have a good option for 325mm in 21" __________________ SCOTT26 "So as an admirer of the M5 and a potential customer of an M5 Touring. I would run naked around the streets of Garching if they were to offer one."
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11-23-2022, 11:22 AM	#17
atillathetom Lieutenant 65 Rep 531 Posts Drives: Bike Join Date: Jun 2008 Location: San Diego iTrader: (0)	IIRC there was a spacer included on those photos as well.
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12-01-2022, 08:40 PM	#18
Rsnk60 M6 Private 34 Rep 99 Posts Drives: 2016 BMW M6 GC Join Date: Mar 2020 Location: Los Angeles, Calif iTrader: (0)	325/25/21 fit perfect with no Spacers when I had mine . Attached Images __________________ M6 Daddy
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12-02-2022, 10:42 PM	#19
bizzmeister Private 10 Rep 68 Posts Drives: 2018 BMW M6 Gran Coupe Join Date: Apr 2021 Location: Los Angeles CA iTrader: (0)	Nice! Thanks for sharing! __________________ 2018 BMW M6 Gran Coupe /// Moonstone Metallic
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