Why 666M on GTS?

Bucketsbentley · 08-14-2016, 02:04 AM

Wondering why BMW would put the 666M wheel on the GTS, rather than choose a lightweight wheel that would reduce unsprung weight significantly

schnell325 · 08-14-2016, 02:08 AM

What's the weight of the 666's?

Bucketsbentley · 08-14-2016, 02:12 AM

25lbs front, 26.5lbs rear, according to IND

schnell325 · 08-14-2016, 02:17 AM

Quote:

Originally Posted by Bucketsbentley

25lbs front, 26.5lbs rear, according to IND

Good info

Draper · 08-14-2016, 03:26 PM

The GTS wheels are not the same as the CP wheels. GTS has 19in front, 20in rear.

Maybe they're lighter too?

Bucketsbentley · 08-14-2016, 04:08 PM

Weight measurements above are for 19" front 20" rear. Happy to be proven wrong that the GTS wheels are somehow different, apart from the paint of course

Draper · 08-14-2016, 09:08 PM

Quote:

Originally Posted by Bucketsbentley

Weight measurements above are for 19" front 20" rear. Happy to be proven wrong that the GTS wheels are somehow different, apart from the paint of course

IND weighed the standard CP 666M wheels which are 20" front and rear.

Bucketsbentley · 08-16-2016, 05:03 AM

Quote:

Originally Posted by Draper

The GTS wheels are not the same as the CP wheels. GTS has 19in front, 20in rear.

Maybe they're lighter too?

I'd thought they'd have offered lighter wheels too. This is what the GTS technical training manual says:

"As standard, forged 19” M light-alloy wheels are used at the front and 20” M light-alloy wheels at the rear in 666M styling."

I guess this is why they offer the carbon wheels as a way to reduce weight

CanAutM3 · 08-16-2016, 09:28 AM

A few data points on dimensions and weights:

GTS 681M - 19X9.5 20.4lb / 20X10.5 24.2lb
GTS 666M - 19X9.5 24.0lb / 20X10.5 28.4lb
ZCP 666M - 20X9.0 25.3lb / 20X10.0 27.1lb
STD 437M - 19X9.0 22.9lb / 19X10.0 24.2lb

When you consider that the front GTS wheel is 0.5 wider than the 437M, the 1.1lb weight penalty is not that bad. Maybe they made the 666M very sturdy.

But I still find the 666M wheels quite heavy compared to the 437M though. I had much higher expectation when BMW advertised the 666M to be "weight optimized"

.

Bucketsbentley · 08-17-2016, 02:05 AM

Totally agree. Don't know why BMW didn't opt for the sort of lightweight wheels Porsche fit on their GT3/GT3 RS.

BBS FI-R weigh in at 16.5lbs front, 18.5lbs rear with M4 GTS spec.

Weight-saving for all 4 wheels is 34.8lbs (15.8kg)!!!

http://f80.bimmerpost.com/forums/sho....php?t=1155359

Nate@IND · 08-17-2016, 09:11 AM

GTS should have came from the factory with BBS FI-R's

te37 · 08-17-2016, 12:06 PM

You guys are forgetting about the carbon wheels

Bucketsbentley · 08-17-2016, 12:15 PM

The point I was making is that BMW are not fitting lightweight wheels as standard. Carbon compound wheels are an option at a considerable price

CanAutM3 · 08-17-2016, 12:16 PM

Quote:

Originally Posted by te37

You guys are forgetting about the carbon wheels

Even the 681M Carbon composite wheels are quire heavy compared the BBS FI-R:

Quote:

Originally Posted by CanAutM3

Starting with the weights of the GTS 666M wheels and (grossly) estimating the 7kg is split at 1.5kg for each front wheel and 2.0kg for each rear wheel, we can estimate the following weight for the 681M CF wheels:

~20.7lb front
~24.0lb rear

CanAutM3 · 08-17-2016, 12:23 PM

Quote:

Originally Posted by Bucketsbentley

Weight measurements above are for 19" front 20" rear. Happy to be proven wrong that the GTS wheels are somehow different, apart from the paint of course

The weight you quoted seem to be for CP 666M (they are very close to the ETK quoted weights). It is important to note that beyond the fact that the front GTS wheel is a 19", the GTS front and rear wheels are also 0.5" wider than the CP, which increases their weight.

mshab356 · 08-25-2016, 01:35 AM

Quote:

Originally Posted by CanAutM3

Quote:

Originally Posted by te37

You guys are forgetting about the carbon wheels

Even the 681M Carbon composite wheels are quire heavy compared the BBS FI-R:

Quote:

Originally Posted by CanAutM3

Starting with the weights of the GTS 666M wheels and (grossly) estimating the 7kg is split at 1.5kg for each front wheel and 2.0kg for each rear wheel, we can estimate the following weight for the 681M CF wheels:

~20.7lb front
~24.0lb rear

That is just ridiculous. 20.7/24 lbs?? Get outta hear with that malarkey.

SROC3 · 08-25-2016, 10:59 AM

Didn't the GTS do the 2nd fastest time around the Nurburgring on these wheels?

CanAutM3 · 08-25-2016, 11:05 AM

Quote:

Originally Posted by SROC3

Didn't the GTS do the 2nd fastest time around the Nurburgring on these wheels?

2nd to what

?

The point is that the weight of the 666M wheels is not a big contributor to the M4 GTS' good performance.

davey111483 · 08-25-2016, 11:40 AM

Tbh, i just switched my 666m to the 437m wheels and i don't know for some reason my car felt slower. i don't know if it was the tires or whatever reason, maybe psychological, but i felt like my car doesn't feel the same. lol. maybe i'm just getting used to the 19s.

myzmak · 08-25-2016, 12:03 PM

Quote:

Originally Posted by Bucketsbentley

Wondering why BMW would put the 666M wheel on the GTS, rather than choose a lightweight wheel that would reduce unsprung weight significantly

Because Satan, obviously.

Rasya · 08-27-2016, 04:08 AM

I think they wanted a really stiff and sturdy wheel seeing probable track use?

Porsche 991 gt3 wheels are also 24-28 lb front-rear...

MW16M3 · 11-14-2016, 12:25 AM

The 666m's probably felt faster to you because it took you longer to slow down..

Quote:

Originally Posted by davey111483

Tbh, i just switched my 666m to the 437m wheels and i don't know for some reason my car felt slower. i don't know if it was the tires or whatever reason, maybe psychological, but i felt like my car doesn't feel the same. lol. maybe i'm just getting used to the 19s.

08-14-2016, 02:04 AM	#1
Bucketsbentley Private 18 Rep 64 Posts Drives: BMW M4 Join Date: Aug 2016 Location: Frankfurt iTrader: (0)	Why 666M on GTS? Wondering why BMW would put the 666M wheel on the GTS, rather than choose a lightweight wheel that would reduce unsprung weight significantly
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08-14-2016, 02:08 AM	#2
schnell325 Bored at work.... 890 Rep 5,390 Posts Drives: 2016 F82 M4 GTS//2022 M235iGC Join Date: Aug 2007 Location: Comox Valley iTrader: (8)	What's the weight of the 666's? __________________ Grey Matter:2008 E92 M3:608/425. SG/PS SOLD! Dark Matter:2015 F80 M3:495/505. SOLD! Anti Matter :2016 F82 M4 GTS What next?!? A 2022 M235i GC- I must be getting old
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08-14-2016, 02:12 AM	#3
Bucketsbentley Private 18 Rep 64 Posts Drives: BMW M4 Join Date: Aug 2016 Location: Frankfurt iTrader: (0)	25lbs front, 26.5lbs rear, according to IND
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08-14-2016, 03:26 PM	#5
Draper Brigadier General 3460 Rep 3,995 Posts Drives: M4 Comp / Macan Turbo Join Date: Jan 2011 Location: Denver iTrader: (38)	The GTS wheels are not the same as the CP wheels. GTS has 19in front, 20in rear. Maybe they're lighter too? __________________ Current: G82 M4 Comp xDrive // Frozen Deep Grey Current: 95B.1 Macan Turbo // Dark Blue Metallic
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08-14-2016, 04:08 PM	#6
Bucketsbentley Private 18 Rep 64 Posts Drives: BMW M4 Join Date: Aug 2016 Location: Frankfurt iTrader: (0)	Weight measurements above are for 19" front 20" rear. Happy to be proven wrong that the GTS wheels are somehow different, apart from the paint of course
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08-16-2016, 09:28 AM	#9
CanAutM3 General 21115 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	A few data points on dimensions and weights: GTS 681M - 19X9.5 20.4lb / 20X10.5 24.2lb GTS 666M - 19X9.5 24.0lb / 20X10.5 28.4lb ZCP 666M - 20X9.0 25.3lb / 20X10.0 27.1lb STD 437M - 19X9.0 22.9lb / 19X10.0 24.2lb When you consider that the front GTS wheel is 0.5 wider than the 437M, the 1.1lb weight penalty is not that bad. Maybe they made the 666M very sturdy. But I still find the 666M wheels quite heavy compared to the 437M though. I had much higher expectation when BMW advertised the 666M to be "weight optimized" . __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black Last edited by CanAutM3; 11-28-2016 at 06:56 AM.. Reason: Edited to add 681M data
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08-17-2016, 02:05 AM	#10
Bucketsbentley Private 18 Rep 64 Posts Drives: BMW M4 Join Date: Aug 2016 Location: Frankfurt iTrader: (0)	Totally agree. Don't know why BMW didn't opt for the sort of lightweight wheels Porsche fit on their GT3/GT3 RS. BBS FI-R weigh in at 16.5lbs front, 18.5lbs rear with M4 GTS spec. Weight-saving for all 4 wheels is 34.8lbs (15.8kg)!!! http://f80.bimmerpost.com/forums/sho....php?t=1155359
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08-17-2016, 09:11 AM	#11
Nate@IND BimmerPost Supporting Vendor 2866 Rep 11,374 Posts Drives: BMW Join Date: Oct 2006 Location: Chicago iTrader: (19)	GTS should have came from the factory with BBS FI-R's __________________ IND DISTRIBUTION \| 866-963-4520 • FACEBOOK • INSTAGRAM • FLICKR
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08-17-2016, 12:06 PM	#12
te37 Major 545 Rep 1,132 Posts Drives: F80 SS/SO 6MT Join Date: Jun 2013 Location: ATL iTrader: (3)	You guys are forgetting about the carbon wheels
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08-17-2016, 12:15 PM	#13
Bucketsbentley Private 18 Rep 64 Posts Drives: BMW M4 Join Date: Aug 2016 Location: Frankfurt iTrader: (0)	The point I was making is that BMW are not fitting lightweight wheels as standard. Carbon compound wheels are an option at a considerable price
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08-25-2016, 10:59 AM	#17
SROC3 The limit of adhesion is my home. 1702 Rep 3,778 Posts Drives: Like a Boss. Join Date: Sep 2006 Location: three.one.zero iTrader: (1)	Didn't the GTS do the 2nd fastest time around the Nurburgring on these wheels? __________________ 2019 X3 xDrive30i Glacier Silver \| Cognac w/ Fine Cove \| MSport \| Premium \| Dynamic Handling PKG \| Drive Assist \| HK w/ Bavsound Upgrade \|
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08-25-2016, 11:40 AM	#19
davey111483 First Lieutenant 109 Rep 364 Posts Drives: my GF crazy! Join Date: Jan 2014 Location: NorCal iTrader: (0) Garage List 2016 BMW M4 ZCP [0.00]	Tbh, i just switched my 666m to the 437m wheels and i don't know for some reason my car felt slower. i don't know if it was the tires or whatever reason, maybe psychological, but i felt like my car doesn't feel the same. lol. maybe i'm just getting used to the 19s. __________________ What is power without control?
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08-27-2016, 04:08 AM	#21
Rasya Private First Class 37 Rep 101 Posts Drives: 2011 BMW 1M; 2016 M4 GTS Join Date: Apr 2011 Location: Belgium iTrader: (0) Garage List 2011 BMW 1M [10.00] 2005 BMW e60 M5 [0.00]	I think they wanted a really stiff and sturdy wheel seeing probable track use? Porsche 991 gt3 wheels are also 24-28 lb front-rear...
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