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Front Brake Rotor size
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bwanainoz
Fri Apr 06 2018, 10:42pm
Registered Member #630
Joined: Sun Jan 20 2013, 10:11am

Posts: 47
What diameter is the front Brake Rotor on the 21 inch cross spoke wheel. Mine is 305mm x 4.5mm.
I would like to purchase a new rotor, although the parts fiche states the 305mm x 4.5mm is only for the Cast Wheel.
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zool
Sat Apr 07 2018, 02:01am
Registered Member #542
Joined: Tue Apr 24 2012, 09:13am

Posts: 35
According to MAX fiche it is 305mm x 4.5mm

https://shop.maxbmw.com/fiche/DiagramsMain.aspx?vid=51734&rnd=07242017

34 11 7 676 550 BRAKE ROTOR, FRONT - D=305/4,5MM

You have one cheap on ebay.com.au

https://www.ebay.com.au/itm/R11200GS-BMW-FRONT-BRAKE-DISC-Non-Floating-Type-2003-07-PART-NO-34-11-7-676/252938850194?epid=1350247546&hash=item3ae4548f92:g:o3oAAOSwDiBZGP-K

Just send them message because the stated two different part no. one in listing and other one in item description to be sure , although on picture is correct no .

Cheers.
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bwanainoz
Sat Apr 07 2018, 02:57am
Registered Member #630
Joined: Sun Jan 20 2013, 10:11am

Posts: 47
Thanks Zool, but there are two rotors listed on the Max BMW site (as below) and it says the 305mm rotor PN 34 11 7 676 550 is only for the cast wheel, so I am wondering if the incorrect rotor has been on my bike since I purchased it. I wuld appreciate if someone could measure the diameter of the rotor they have on their 21" cross spoke wheel. Thanks

ONLY SUITABLE FOR CROSS SPOKE WHEEL :
03 34 11 7 670 939 BRAKE ROTOR, FRONT - D=320/5MM 2.80 1 $384.85ADD TO CART

ONLY APPLIES TO CAST RIM :
03 34 11 7 676 550 BRAKE ROTOR, FRONT - D=305/4,5MM 2.43 1 $384.85ADD TO CART

Also, I have seen the rotor for sale on ebay, although want to make sure it is correct for the 21" cross spoke wheel.

[ Edited Sat Apr 07 2018, 02:58am ]
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oldfool
Sat Apr 07 2018, 03:30am
Registered Member #59
Joined: Sat Jan 24 2009, 06:09am

Posts: 67
I know the brake rotor on my original wheel is smaller then the one on the street wheels. Although I always run the larger rotor on both wheel sets.
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zool
Sat Apr 07 2018, 03:35am
Registered Member #542
Joined: Tue Apr 24 2012, 09:13am

Posts: 35
Larger one is for SM 17'' wheels. If you are looking at 02_0120 - BRAKE SERVICE it is incorrect. Look under 34_1535 - FRONT WHEEL BRAKE and compare with 36_1026 - WHEEL SET ROAD you will see that SM wheels have bigger rotor 320 mm . Or you can ring BMW dealer and ask them to be sure .

Mine have smaller disc on 21'' and larger on 17''.

Also here you can find specification for bike and you can see that it is 305 mm rotor.

http://www.hp2enduro.com/page.php?2/favicon.ico


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bwanainoz
Sat Apr 07 2018, 08:43am
Registered Member #630
Joined: Sun Jan 20 2013, 10:11am

Posts: 47
Thanks to all for resolving this issue. Our BMW dealer here didn't know as they were also relying on the same data that I had available to myself. Until I receive the new 305mm rotor for the 21" cross-spoke wheel, I have attached the 320mm rotor to it. Regards
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