F800GS front brake rotors.

Discussion in 'Parallel Universe' started by The Griz, Feb 25, 2009.

  1. The Griz

    The Griz Long timer

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    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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  2. tmex

    tmex Long timer

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    I cannot find the Wunderlich rotors for the F800GS. Can you provide a link?
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  3. The Griz

    The Griz Long timer

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  4. LarryC

    LarryC Adventurer

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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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  5. The Griz

    The Griz Long timer

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    I'm not sure. I don't have a service manual either.
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  6. tmex

    tmex Long timer

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    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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  7. tmex

    tmex Long timer

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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:

    [​IMG]

    Caliper picture from your reference:

    [​IMG]
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  8. WoodWorks

    WoodWorks House Ape

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  9. The Griz

    The Griz Long timer

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    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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  10. tmex

    tmex Long timer

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    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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  11. Motomantra

    Motomantra Registered Lurker

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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.
    #11
  12. RedHawk47

    RedHawk47 Adventurer

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    The caliper bolts on my F800GS are Torx socket heads as shown in the second photo. (what you referred to as female)
    #12
  13. johngil

    johngil Reseda, CA

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    An Ipod may cure your problems.
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  14. The Griz

    The Griz Long timer

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    Very true! :super
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  15. Bike4Fun

    Bike4Fun Smooth IS Fast

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    Yeah for ever since it will quickly lead to you taking a dirt nap! :mad?

    just my .02
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  16. rossaduc

    rossaduc Adventurer

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    Interesting to see you safety wired those bolts. I have owned alot of bikes over almost 40 years of riding, well mine and wife. A couple years back the rear caliper literally fell off of my 11550 GS A and nearly took me with it. Just recently I pulled fron calipers for a look see and cleaning inspection, tightened everything bcak up and in a week or so had fron end noise, one of the torq bolts had fallen out. Now mind you the stock torque for these bolts as I recall is 40 foot pounds, not much. I have found that at least on the 1150 that if bolt loosenes at all it will rattle in its threaded bore easily and this I am sure leads to bolts falling out. I am not sure why BMW has usch a loose fit on caliper mounting bolt hole threaded bores but they do. I also am not a fan of torq fasteners. I presently use lock washers on all of these fasteners as I get to them. I am also going to convert to standr hex socket head bolts, something I have lots of tools for meaning bits I can put on torque wrench. I think safety wiring these fasteners is a good diea. Or at least loctiting or lockwashering them. I have not had this issue with any other bike, in fact I use antiseize on my 996R sand have had calkipers off a zillion times and do not use a torque wrench. I have never even had one loosen and I do not use any locking agent. Of course the current ti fasteners in use are a nice fit in the threaded bores as well. Rich
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  17. rossaduc

    rossaduc Adventurer

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    Guys the terminolgy is SHCS socket head cap screw, HHCS, hex head cap screw, or torq head cap screw. Not male or female but hex or socket or torq. Clearly someone has replaced the standard fasteners with cap screws drilled for safety wire. You can also do this with a socket style cap screw. Rich
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  18. bxr140

    bxr140 Flame Bait

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    +1. They're also less susceptible to incorrect torquing to the hub.

    Floating > Fixed
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  19. sfwo79

    sfwo79 euroromper

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    I have not been able to find instructions for temporarily disabling the ABS on the 800GS for dirt riding. Can anyone point me in the right direction? I've already had one little spill thanks to the inability to lock up the rear brakes and I thought there was a way to do this. :ear
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  20. DockingPilot

    DockingPilot Hooked Up and Hard Over

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    Yes, stop the bike. Dont shut her down, just stop the wheels from turning. Hit the ABS button, your ABS light will .....well, light. Whala, it's off. Riding off pavement with ABS will kill you eventually.
    #20