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Old 02-25-2009, 09:40 AM   #1
The Griz OP
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F800GS front brake rotors.

Has anyone put different aftermarket rotors on the front wheel? Like the Wunderlich ones? If so, did it "quiet things up" on the front of the bike?

After re-torquing my steering head bearings, the noise and loose feeling that I was constantly complaining about went away for the most part. I still have a bit of a clack/chatter noise in the front when I hit rough spots in the road. The floating rotors on this bike are VERY loose. I'm assuming that they are the culprit. The ones that Wunderlich sells are non-floating. So I was wondering if anyone has any experience with them. Thanks!
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Old 02-25-2009, 12:51 PM   #2
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Quote:
Originally Posted by The Griz
Has anyone put different aftermarket rotors on the front wheel? Like the Wunderlich ones? If so, did it "quiet things up" on the front of the bike?

After re-torquing my steering head bearings, the noise and loose feeling that I was constantly complaining about went away for the most part. I still have a bit of a clack/chatter noise in the front when I hit rough spots in the road. The floating rotors on this bike are VERY loose. I'm assuming that they are the culprit. The ones that Wunderlich sells are non-floating. So I was wondering if anyone has any experience with them. Thanks!
I cannot find the Wunderlich rotors for the F800GS. Can you provide a link?
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Old 02-25-2009, 02:24 PM   #3
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Quote:
Originally Posted by tmex
I cannot find the Wunderlich rotors for the F800GS. Can you provide a link?
http://www.wunderlich.de/frame.php?M...prodid=8130021

http://www.wunderlichamerica.com/mm5...w=&range_high=
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Old 02-25-2009, 05:21 PM   #4
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Can you tell me what the torque specs are for the caliper bolts? I ordered my F800GS Manual but have been told it is back ordered 2 months. Thanks in advance
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Old 02-25-2009, 05:26 PM   #5
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Quote:
Originally Posted by LarryC
Can you tell me what the torque specs are for the caliper bolts? I ordered my F800GS Manual but have been told it is back ordered 2 months. Thanks in advance
I'm not sure. I don't have a service manual either.
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Old 02-25-2009, 05:27 PM   #6
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Quote:
Originally Posted by LarryC
Can you tell me what the torque specs are for the caliper bolts? I ordered my F800GS Manual but have been told it is back ordered 2 months. Thanks in advance
Larry, the caliper bolt torque specs are in the owner's manual. I cannot recall what the value is off hand, so you best look it up or wait for someone else. I did find it in the manual, however.
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Old 02-25-2009, 05:38 PM   #7
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The rotor in the picture is not mounted on an F800GS. A give away is the caliper bolts which are female. The caliper bolts on the F800GS are male. I do not know what bike that is, but it is not an F800GS. I do not think Wunderlich sells rotors for the F800GS.

My F800GS caliper below:



Caliper picture from your reference:

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Old 02-25-2009, 05:39 PM   #8
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Quote:
Originally Posted by LarryC
Can you tell me what the torque specs are for the caliper bolts? I ordered my F800GS Manual but have been told it is back ordered 2 months. Thanks in advance
Seek, and ye shall find.
Ask, and it shall be given to you.

http://f800riders.org/HoW/showentry....s&searchid=639

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Old 02-25-2009, 05:54 PM   #9
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Quote:
Originally Posted by tmex
The rotor in the picture is not mounted on an F800GS. A give away is the caliper bolts which are female. The caliper bolts on the F800GS are male. I do not know what bike that is, but it is not an F800GS. I do not think Wunderlich sells rotors for the F800GS.
Then why would Wunderlich have them on their site listed under F800GS? I know for sure that Lucas (out of France) makes them for the F650/F800GS twins and Wunderlich sells them. I called Wunderlich-USA. Those female bolts you see on there were probably just replaced by the Wunderlich staff who installed the rotors. Or maybe those are the bolts they used by BMW for a while. Just because a couple of bolts look a little different doesn't mean that it's not an F800GS. In fact, I know for sure that it's an F800GS because no other bike's fork protector, axle, and fender connection looks like that. It's unique to the F800GS.

P.S. You'll also notice the Wunderlich neoprene fork gaiters on there!

P.S.S. Wunderlich-America doesn't stock them. They have to order them from Germany, which is why it takes 2-3 weeks to ship.
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Old 02-25-2009, 06:17 PM   #10
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Quote:
Originally Posted by The Griz
Then why would Wunderlich have them on their site listed under F800GS? I know for sure that Lucas (out of France) makes them for the F650/F800GS twins and Wunderlich sells them. I called Wunderlich-USA. Those female bolts you see on there were probably just replaced by the Wunderlich staff who installed the rotors. Or maybe those are the bolts they used by BMW for a while. Just because a couple of bolts look a little different doesn't mean that it's not an F800GS. In fact, I know for sure that it's an F800GS because no other bike's fork protector, axle, and fender connection looks like that. It's unique to the F800GS.

P.S. You'll also notice the Wunderlich neoprene fork gaiters on there!

P.S.S. Wunderlich-America doesn't stock them. They have to order them from Germany, which is why it takes 2-3 weeks to ship.
OK. The only reason I was doubtful is that I was simply not able to find a proof positive English reference to their availability. The price is certainly reasonable, and might justify a switch if you tweaked an OEM rotor not to mention that you would wait longer than a few weeks replacing any major OEM part on an F8.

I do believe you are correct in the source of the clack. You can prove this by riding the same set of bumps with and without the front brake lightly applied. Short of the clacking, I prefer the floating rotors, but the rigidly mounted rotors might well dissipate heat better.
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Old 02-27-2009, 11:11 AM   #11
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The rotors are less apt to warp due to heat if they are allowed to float. Even the rotors on my 9 will make some noise.
Not trying to change your mind, or be a smart ass, just wondering if you've considered this.
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Old 02-27-2009, 11:32 AM   #12
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Bolts

Quote:
Originally Posted by tmex
The rotor in the picture is not mounted on an F800GS. A give away is the caliper bolts which are female. The caliper bolts on the F800GS are male. I do not know what bike that is, but it is not an F800GS. I do not think Wunderlich sells rotors for the F800GS.
The caliper bolts on my F800GS are Torx socket heads as shown in the second photo. (what you referred to as female)
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Old 02-27-2009, 11:35 AM   #13
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An Ipod may cure your problems.
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Old 02-27-2009, 12:00 PM   #14
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Quote:
Originally Posted by johngil
An Ipod may cure your problems.
Very true!
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Old 02-27-2009, 01:08 PM   #15
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Quote:
Originally Posted by johngil
An Ipod may cure your problems.
Yeah for ever since it will quickly lead to you taking a dirt nap!

just my .02
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