OEM front rotors

Vanne · 05-09-2015, 02:55 PM

Hi guys, got my OEM front rotors in the other day… and i am not sure, but theres a bit grinder off on the disc.. see pic..

is this for balancing the rotor? and normal? or is this not normal? my other rotar has it too, but smaller….

there spanking new..

thanks guys

Vanne · 05-09-2015, 03:16 PM

yep, the wife is gonna kill me for using her good chopping board…

an3ony · 05-09-2015, 05:32 PM

My guess would be its part of the manufacturing process, most brake disks have this. I assume its for the jig which drills out the bolt pattern

The HACK · 05-09-2015, 07:00 PM

Yes.

dc_wright · 05-09-2015, 09:27 PM

Yep. Material removed is for balancing.

Vanne · 05-09-2015, 10:12 PM

thanks guys, had me worried for a second there..

jdoublehcubed · 05-11-2015, 01:38 AM

will have to look for that next time I have the wheels off. kind of a lot of material for balancing. I mean, you can road force balance a whole wheel with about 2 ounces of weight if you're good.

05-09-2015, 02:55 PM	#1
Vanne Down Under!! 1621 Rep 4,294 Posts Drives: 2007 Z4MC Join Date: Mar 2013 Location: Dubai iTrader: (4)	OEM front rotors Hi guys, got my OEM front rotors in the other day… and i am not sure, but theres a bit grinder off on the disc.. see pic.. is this for balancing the rotor? and normal? or is this not normal? my other rotar has it too, but smaller…. there spanking new.. thanks guys __________________ 2007 EuroSpec Z4///MC - Building/Developing Z4 GT3 Powered by
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05-09-2015, 03:16 PM	#2
Vanne Down Under!! 1621 Rep 4,294 Posts Drives: 2007 Z4MC Join Date: Mar 2013 Location: Dubai iTrader: (4)	yep, the wife is gonna kill me for using her good chopping board… __________________ 2007 EuroSpec Z4///MC - Building/Developing Z4 GT3 Powered by
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05-09-2015, 05:32 PM	#3
an3ony Private First Class 39 Rep 181 Posts Drives: 2011 135i Join Date: May 2012 Location: Saugus, MA iTrader: (1)	My guess would be its part of the manufacturing process, most brake disks have this. I assume its for the jig which drills out the bolt pattern
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05-09-2015, 07:00 PM	#4
The HACK Midlife Crises Racing Silent but Deadly Class 1820 Rep 5,337 Posts Drives: 2006 MZ4C, 2021 Tesla Model 3 Join Date: Oct 2007 Location: Welcome to Jamaica have a nice day iTrader: (1)	Yes. __________________ Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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05-09-2015, 09:27 PM	#5
dc_wright Captain 249 Rep 758 Posts Drives: 2006 Z43.0si Roadster Join Date: Oct 2014 Location: Orlando, FL iTrader: (0)	Yep. Material removed is for balancing. __________________ Top Down 365
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05-09-2015, 10:12 PM	#6
Vanne Down Under!! 1621 Rep 4,294 Posts Drives: 2007 Z4MC Join Date: Mar 2013 Location: Dubai iTrader: (4)	thanks guys, had me worried for a second there.. __________________ 2007 EuroSpec Z4///MC - Building/Developing Z4 GT3 Powered by
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05-11-2015, 01:38 AM	#7
jdoublehcubed Mechanical Engineer 96 Rep 1,025 Posts Drives: 2006 Z4MR, Imola Red Join Date: Jul 2012 Location: Anaheim, CA iTrader: (1)	will have to look for that next time I have the wheels off. kind of a lot of material for balancing. I mean, you can road force balance a whole wheel with about 2 ounces of weight if you're good.
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