Z4 3.0si Rear Rotor

3002 tii · 07-16-2014, 11:10 AM

I'm shopping for new rear rotors for my Non-M. The specs are 294x19 and the OEM part number is: 34216794303

Tire Rack offers Brembo blanks at $73 each, but I noticed that the E46 325ci also uses the same sized rotors of 294x19. That OEM part number is 34216855154 (or 34216855156). Tire Rack offers Brembo Blanks for this application at $56 each.

Am I wrong to assume these rotors are interchangeable and I can just buy Brembo E46 ones, or is there more to diameter & thickness (ie offset perhaps)? Yes yes, diameter and thickness, that's what she said... let's just get out now LOL.

Steeler · 07-16-2014, 11:19 AM

I do believe the "hat" of the E46 rotor is quite a bit shallower than our Z4 pieces.
Good info here http://www.zpost.com/forums/showthread.php?t=751080

The HACK · 07-16-2014, 11:20 AM

If the PN is different it could indicate some subtleties that may result in a problematic fit. However it's impossible to know unless you get one to try out.

For example, the ebrake drum is/can be different while the size of the rotor is the same. Or the hub offset is different. But I also know the E89 rotor is a direct fit to the E9x but the part number is different, due to a 2 piece hub design to save weight.

So take that for what it's worth. I'd see if someone on the E46 board has taken off of their rear rotors and see if you can borrow it for a test fit before you buy.

3002 tii · 07-16-2014, 11:45 AM

Thanks everyone

I'm now getting in the habit of bringing spare rotors/pads to the track. I failed Tech on day 3 of a long weekend at Watkins last month. Had to run around the paddock looking for someone willing to sell me ST40 pads lol. Fortunately I did find someone and pad swap on a BBK takes all but 5 mins lol =D

Karacticus · 07-16-2014, 12:38 PM

I've been using the Centric parts (same mfr as Stoptech, just not slotted and/or drilled) with good results.

Cheap from Rockauto -- $48 each for the rears and $41 for the fronts

3002 tii · 07-16-2014, 12:42 PM

Quote:

Originally Posted by Karacticus

I've been using the Centric parts (same mfr as Stoptech, just not slotted and/or drilled) with good results.

Cheap from Rockauto -- $48 each for the rears and $41 for the fronts

For a while, I used the Advance Auto for the rears since I figured cheap blanks were just that but I did notice the Brembo ones lasted a little longer. Advance Auto is nice because they always have 30% off $xx + free s/h coupons so I was able to get rotors at $30 something a piece lol. But I'll check out RockAuto for sure...

Karacticus · 07-16-2014, 12:47 PM

They've worked fine for me. Center (hat, such as it is) has a nice e-coat on it so it doesn't rust.

Next time I do the rotors on mine, I need to wire brush and hi-temp paint the hubs so they don't rust so much.

jdoublehcubed · 07-16-2014, 02:55 PM

I would say go for it.

Sssshhhhh, don't tell anyone, but i'm running e46 M3 rear brake rotors on my Z4M.

Same diameter, thickness, rotor depth etc. I probably picked up 3 or 4 pounds because the M3 rotors are one piece, while the Z4M rotors are 2 piece.

The BMW rotors are somewhere in the neighborhood of $350 for the set, Stoptech M3 rotors were about $140 for the set.

Karacticus · 07-16-2014, 03:41 PM

5% off at Rockauto

http://grassrootsmotorsports.com/for...4/88806/page1/

GuidoK · 07-16-2014, 06:35 PM

Quote:

Originally Posted by jdoublehcubed

I would say go for it.

Sssshhhhh, don't tell anyone, but i'm running e46 M3 rear brake rotors on my Z4M.

Same diameter, thickness, rotor depth etc. I probably picked up 3 or 4 pounds because the M3 rotors are one piece, while the Z4M rotors are 2 piece.

3002 tii doesn't have a z4m but a regular z4. That has a different rear axle (and therefore different rotors).

On the brembo aftermarket site/catalogue there are technical drawings with measurements for all their bmw rotors so you can check it (and they won't fit):
http://bremboaftermarket.com/En/Car_...ue_Search.aspx
(check for the e46 325ci that is; brembo doesn't supply /m style rotors)

onthe3rdday · 07-19-2014, 11:24 AM

Centric Parts has a fantastic parts information database. e46 325ci on the left z4 on the right. Notice the hat height.

07-16-2014, 11:10 AM	#1
3002 tii Lieutenant General 2282 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.22]	Z4 3.0si Rear Rotor - Cross Shopping Cheaper (E46) Options? I'm shopping for new rear rotors for my Non-M. The specs are 294x19 and the OEM part number is: 34216794303 Tire Rack offers Brembo blanks at $73 each, but I noticed that the E46 325ci also uses the same sized rotors of 294x19. That OEM part number is 34216855154 (or 34216855156). Tire Rack offers Brembo Blanks for this application at $56 each. Am I wrong to assume these rotors are interchangeable and I can just buy Brembo E46 ones, or is there more to diameter & thickness (ie offset perhaps)? Yes yes, diameter and thickness, that's what she said... let's just get out now LOL. __________________ Follow for latest mods
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07-16-2014, 11:19 AM	#2
Steeler Colonel 2428 Rep 2,704 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	I do believe the "hat" of the E46 rotor is quite a bit shallower than our Z4 pieces. Good info here http://www.zpost.com/forums/showthread.php?t=751080 __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
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07-16-2014, 11:20 AM	#3
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)	If the PN is different it could indicate some subtleties that may result in a problematic fit. However it's impossible to know unless you get one to try out. For example, the ebrake drum is/can be different while the size of the rotor is the same. Or the hub offset is different. But I also know the E89 rotor is a direct fit to the E9x but the part number is different, due to a 2 piece hub design to save weight. So take that for what it's worth. I'd see if someone on the E46 board has taken off of their rear rotors and see if you can borrow it for a test fit before you buy. __________________ 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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07-16-2014, 11:45 AM	#4
3002 tii Lieutenant General 2282 Rep 12,565 Posts Drives: Z4 M, X5, GX460 Join Date: Apr 2008 Location: CT iTrader: (99) Garage List F15 X5 xDrive35i [8.75] E86 Z4 M [10.00] F10 550i (Retired) [9.17] F25 X3 xDrive35i (R ... [9.43] E82 135is (Retired) [9.50] E85 Z4 M (Retired) [9.41] E90 328i xDrive (Re ... [9.25] E86 Z4 3.0si (Retired) [9.22]	Thanks everyone I'm now getting in the habit of bringing spare rotors/pads to the track. I failed Tech on day 3 of a long weekend at Watkins last month. Had to run around the paddock looking for someone willing to sell me ST40 pads lol. Fortunately I did find someone and pad swap on a BBK takes all but 5 mins lol =D __________________ Follow for latest mods
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07-16-2014, 12:38 PM	#5
Karacticus Second Lieutenant 15 Rep 222 Posts Drives: 2007 Z4 3.0si Coupe Join Date: May 2007 Location: Iowa iTrader: (0)	I've been using the Centric parts (same mfr as Stoptech, just not slotted and/or drilled) with good results. Cheap from Rockauto -- $48 each for the rears and $41 for the fronts __________________ 2007 3.0si Coupe Dinan Stage I Suspension (Shocks, Struts, Springs), Ground Control Front Camber Plates, Treehouse Racing Front Control Arm Bushings, RTAB Bushing Limiters
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07-16-2014, 12:47 PM	#7
Karacticus Second Lieutenant 15 Rep 222 Posts Drives: 2007 Z4 3.0si Coupe Join Date: May 2007 Location: Iowa iTrader: (0)	They've worked fine for me. Center (hat, such as it is) has a nice e-coat on it so it doesn't rust. Next time I do the rotors on mine, I need to wire brush and hi-temp paint the hubs so they don't rust so much. __________________ 2007 3.0si Coupe Dinan Stage I Suspension (Shocks, Struts, Springs), Ground Control Front Camber Plates, Treehouse Racing Front Control Arm Bushings, RTAB Bushing Limiters
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07-16-2014, 02:55 PM	#8
jdoublehcubed Mechanical Engineer 96 Rep 1,025 Posts Drives: 2006 Z4MR, Imola Red Join Date: Jul 2012 Location: Anaheim, CA iTrader: (1)	I would say go for it. Sssshhhhh, don't tell anyone, but i'm running e46 M3 rear brake rotors on my Z4M. Same diameter, thickness, rotor depth etc. I probably picked up 3 or 4 pounds because the M3 rotors are one piece, while the Z4M rotors are 2 piece. The BMW rotors are somewhere in the neighborhood of $350 for the set, Stoptech M3 rotors were about $140 for the set.
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07-16-2014, 03:41 PM	#9
Karacticus Second Lieutenant 15 Rep 222 Posts Drives: 2007 Z4 3.0si Coupe Join Date: May 2007 Location: Iowa iTrader: (0)	5% off at Rockauto http://grassrootsmotorsports.com/for...4/88806/page1/ __________________ 2007 3.0si Coupe Dinan Stage I Suspension (Shocks, Struts, Springs), Ground Control Front Camber Plates, Treehouse Racing Front Control Arm Bushings, RTAB Bushing Limiters
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07-19-2014, 11:24 AM	#11
onthe3rdday Private 24 Rep 75 Posts Drives: 07 Z4C Join Date: Feb 2014 Location: United States iTrader: (0)	Centric Parts has a fantastic parts information database. e46 325ci on the left z4 on the right. Notice the hat height. Attached Images
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