titanium lug bolts

stressdoc · 07-26-2009, 02:06 PM

Anyone gone bonkers and put out the $ for titanium lug bolts? They can save almost 1lb. per wheel.

GregL · 07-26-2009, 03:19 PM

Quote:

Originally Posted by stressdoc

Anyone gone bonkers and put out the $ for titanium lug bolts? They can save almost 1lb. per wheel.

How much money are we talking about here?

JDLM · 07-26-2009, 03:33 PM

give me a figure..

remmib · 07-26-2009, 06:48 PM

What, save 1 lbs?!? I don't even think the 5 bolts per wheels weight that much.

JDLM · 07-26-2009, 06:52 PM

Quote:

Originally Posted by remmib

What, save 1 lbs?!? I don't even think the 5 bolts per wheels weight that much.

I did a quick search on google and the porsche crowd said the same thing

GregL · 07-26-2009, 07:44 PM

I just weighed one of the stock black lugbolts on my ultra precise digital scale. They only weigh 61g/2.15oz a piece, so a set of 5 only add up to 305g/10.75oz per wheel. Given that there are 16oz in a pound, I think the conclusion from this vs the claim is self-explanatory.

remmib · 07-27-2009, 05:06 AM

Quote:

Originally Posted by GregL

I just weighed one of the stock black lugbolts on my ultra precise digital scale. They only weigh 61g/2.15oz a piece, so a set of 5 only add up to 305g/10.75oz per wheel. Given that there are 16oz in a pound, I think the conclusion from this vs the claim is self-explanatory.

Just as I thought.

The saving 1 lbs thing only makes sense if we're talking about titanium rivets on a 3-pc wheel.

twinturboa51 · 07-27-2009, 09:29 AM

how about just buying titanium wheels

GreenPlease · 07-27-2009, 11:36 AM

^

Titanium is actually pretty heavy though it has a high specific strength (strength/weight). The sheer volume of metal you'd need to make the shape of the wheel would make it unduly heavy.

stressdoc · 07-28-2009, 12:05 AM

Hmmm -- why are the P-cars, Ferraris et al able to save .8lbs per wheel? Are their OEM bolts that much heavier? Looks pointless for our bimmers if only a few ounces can be saved.

Here is one source: http://www.6speedonline.com/forums/w...eel-bolts.html

808E90 · 07-28-2009, 12:44 AM

I went with a stud kit and I'm running R40 lugs ... But no weight savings for me

http://www.e90post.com/forums/showthread.php?t=278094

GregL · 07-28-2009, 01:39 AM

Quote:

Originally Posted by stressdoc

Hmmm -- why are the P-cars, Ferraris et al able to save .8lbs per wheel? Are their OEM bolts that much heavier? Looks pointless for our bimmers if only a few ounces can be saved.

Here is one source: http://www.6speedonline.com/forums/w...eel-bolts.html

I have no idea...but something else just crossed my mind. Lugbolts by nature sit directly infront of the hub, I don't think weight savings in that area would have nearly as much impact when rotational mass comes into play vs something like rivets and/or bolts on a 3-piece wheel (which remmib mentioned) that sit near the edges...and I think those are typically made out of titanium anyway.

joyride08 · 07-28-2009, 12:20 PM

Yes, as GregL was getting at. The 1 lbs. saving, I would guess, is in rotational mass savings per wheel. They may just be more of a cosmetic upgrade more then anything.

mds82 · 07-28-2009, 12:47 PM

i would prefer to take a leak or a sh$t before getting in the car - that would save more weight and cost a lot less.... ha ha

stressdoc · 07-28-2009, 09:57 PM

If you don't understand unsprung weight don't bother wasting e-space.

07-26-2009, 02:06 PM	#1
stressdoc Moderator 657 Rep 10,863 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	titanium lug bolts Anyone gone bonkers and put out the $ for titanium lug bolts? They can save almost 1lb. per wheel. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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07-26-2009, 03:33 PM	#3
JDLM Banned 73 Rep 3,276 Posts Drives: 2009 335i Sedan Join Date: Aug 2008 Location: Kansas iTrader: (4)	give me a figure..
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07-26-2009, 06:48 PM	#4
remmib General 1584 Rep 29,215 Posts Drives: 2013 F10 520d M-Sport Join Date: Feb 2006 Location: Norway iTrader: (0)	What, save 1 lbs?!? I don't even think the 5 bolts per wheels weight that much. __________________ F10 520d M-Sport Alpine White \| HRE P43SC 20x9+20x11 \| Michelin PSS 255/35+295/30 \| KW V3 Coilover \| M5 Front Sway Bar + M550d Rear Sway Bar \| 3DDesign Front Lip \| BMW M Performance CF Spoiler \| BMW M Performance Diffuser \| BMW M Performance Black Grills \| BMW M Performance Pedals \|
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07-26-2009, 07:44 PM	#6
GregL Brigadier General 105 Rep 3,618 Posts Drives: 2016 CLA45 AMG Join Date: Nov 2005 Location: GTA iTrader: (4)	I just weighed one of the stock black lugbolts on my ultra precise digital scale. They only weigh 61g/2.15oz a piece, so a set of 5 only add up to 305g/10.75oz per wheel. Given that there are 16oz in a pound, I think the conclusion from this vs the claim is self-explanatory. __________________ 2016 Mercedes-AMG CLA45 2013 Mercedes-Benz B250 - Gone 2010 Mercedes-Benz C350 4Matic - Gone 2006 BMW 330xi - Gone 2001 Infiniti QX4 - Gone
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07-27-2009, 09:29 AM	#8
twinturboa51 Captain 20 Rep 637 Posts Drives: Mineral Grey F80 M3 Join Date: Feb 2009 Location: Boston iTrader: (0)	how about just buying titanium wheels __________________
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07-27-2009, 11:36 AM	#9
GreenPlease Lieutenant Colonel 146 Rep 1,629 Posts Drives: BMW 335i e92 Join Date: Feb 2008 Location: Orlando Florida iTrader: (2)	^ Titanium is actually pretty heavy though it has a high specific strength (strength/weight). The sheer volume of metal you'd need to make the shape of the wheel would make it unduly heavy.
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07-28-2009, 12:05 AM	#10
stressdoc Moderator 657 Rep 10,863 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	Hmmm -- why are the P-cars, Ferraris et al able to save .8lbs per wheel? Are their OEM bolts that much heavier? Looks pointless for our bimmers if only a few ounces can be saved. Here is one source: http://www.6speedonline.com/forums/w...eel-bolts.html __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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07-28-2009, 12:44 AM	#11
808E90 808E90 255 Rep 4,045 Posts Drives: E90 ///M Join Date: Aug 2008 Location: Aloha State iTrader: (21)	I went with a stud kit and I'm running R40 lugs ... But no weight savings for me http://www.e90post.com/forums/showthread.php?t=278094
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07-28-2009, 12:20 PM	#13
joyride08 Joyride 4 Rep 71 Posts Drives: 2007 335i \| Black/Black/Alum Join Date: Apr 2009 Location: Detroit, MI / Louisville, KY iTrader: (2)	Yes, as GregL was getting at. The 1 lbs. saving, I would guess, is in rotational mass savings per wheel. They may just be more of a cosmetic upgrade more then anything. __________________ 2007 335i Coupe \| MT \| Black/Black/Alum \| Sprt + Cold + Prem pkgs
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07-28-2009, 12:47 PM	#14
mds82 Major General 372 Rep 5,842 Posts Drives: 2006 325xi Join Date: Aug 2005 Location: South Central Connecticut iTrader: (40) Garage List 2006 325xi Snow Pics [0.00] 2006 BMW 325xi [0.00]	i would prefer to take a leak or a sh$t before getting in the car - that would save more weight and cost a lot less.... ha ha
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07-28-2009, 09:57 PM	#15
stressdoc Moderator 657 Rep 10,863 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	If you don't understand unsprung weight don't bother wasting e-space. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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