Low Fender 91-95 GS Pic

Discussion in 'Old's Cool' started by Martian, Feb 6, 2011.

  1. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    Will someone please post some pics of the low fender on a 91-95 GS. The more detailed the better. I'm wanting to fit one to my R100R and need to see how it is done on the GS. Is the fork stabilizer the same as on the high fender version?

    TIA,
    Tom
    #1
  2. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    Surely someone has this information. Please share.
    #2
  3. mykill

    mykill odd

    Joined:
    Feb 6, 2008
    Oddometer:
    1,168
    Location:
    Los Angeles
    The fender is mounted to the pressed steel fork "brace",which also holds the brake hose/line junction. Just four bolts IIRC. I will try to take images later. San Jose still has their cast fork brace which replaces the stock stamped version. They have two versions, one with fender mounting holes and one without. It is probably cheaper than a new one from BMW.
    Hope that helps.
    #3
  4. Panic

    Panic Anxiety's little friend

    Joined:
    Jan 7, 2004
    Oddometer:
    1,307
    Location:
    Metro Chaingolia
    Not the most detailed pic but...........
    [​IMG]
    #4
  5. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    Thanks, Panic and Mykill.

    I've looked at the parts fiche on MaxBMW's site and they list the low fender ($118), but not a seperate fork stabilizer. The standard GS stabilizer is $52, but the SJBMW one looks really nice. I've got to replace the R100R "brace" and fender since I'm putting a 19" rim up front.
    #5
  6. wirewrkr

    wirewrkr the thread-killer

    Joined:
    May 23, 2008
    Oddometer:
    4,295
    Location:
    HIGH desert
    The San Jose Brace is awesome but doesn't fit the front end of an R100R
    Your front end is made by Showa, The GS front end is Marzocchi.
    If you find a way to make it work please share!
    #6
  7. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    Now, the R100R has a stock 2-pc low fender (front and rear) so it's construction is different, more like the K-bikes. So, not sure what you're trying to do, fitting a 1-pc low fender a la R100GS?


    Here is how the optional low fender for a R100GS works.

    You need to find the later 1991-1996 R100GSxx style steel fork brace that has 4 holes and 4 threads. The part # is 12342312119. The 4 holes are for mounting it to the fork sliders, the 4 threads are for mounting the low fender which was stock for the 1991-1996 GS. The brake lines should work as they are, but I am not sure.

    The SJBMW stabilizer is very nice, I have one fitted myself. They once had one version for the early GS (4 holes) and one for the later (4 holes, 4 threads). But it fits the Marzocchi forks only.

    I am with Robert: I don't believe you can make it work with stock parts on a R100R.
    #7
  8. bikecat

    bikecat Long timer

    Joined:
    Jan 20, 2006
    Oddometer:
    1,123
    Location:
    Tropical Far East
    Martian

    Is there a chance that the low GS fender interfere with the R100R's calipers' crossover brakeline/pipe? If you need measurements hole-to-hole for a low fender I can put them up for ya.

    Cheers
    #8
  9. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    Thanks. You've saved me the time and expense of following this dead end.

    The problem I'm trying to solve is the lack of space between the fender/brace and the tire on my R; it fills with mud and is practically impossible to cleanout on the road. The 18" front rim is being replaced with the R1100GS 19" rim so I can use a regular DS tire. Of course, this is going to reduce the clearance even more. Thus, the desire for a fender/brace with more clearance. I'm hoping to be able to use off-the-shelf parts to keep the cost reasonable. BTW, that part number doesn't match anything on MaxBMW's fiche.:scratch

    It is possible that the brakeline crossover will be an issue. However, there are bends that may provide a little wiggle room so I can clamp the pipe to the new brace over the fender. It may require lifting the calipers to install the fender, but a new crossover is not out of the question.

    I would greatly appreciate any measurements you could provide me.

    I will share my progress as I gather the stuff to try and solve this issue. I was hoping somebody else had GSified a '93 R100R and would be able to share what worked, but if there is, they haven't come forward.......yet.:ear
    #9
  10. bikecat

    bikecat Long timer

    Joined:
    Jan 20, 2006
    Oddometer:
    1,123
    Location:
    Tropical Far East
    Dear Martian,

    I took some measurements of the holes on a R100GS low-fender. The holes are about 185 mm across eye to eye, and about 110 mm front to back. By contrast, a rough measurement puts the R100R holes about 160 mm apart so I guest they are not compatible.

    How about mounting a GS high fender to solve the mud issue?
    #10
  11. bmwhd

    bmwhd God Bless Texas

    Joined:
    Dec 15, 2003
    Oddometer:
    1,476
    Location:
    Texas
    [​IMG]
    #11
  12. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA

    Thanks, but in my impatience to advance this project and with too much snow/cold to work, I've already ordered the GS brace and low fender from the dealer in KC. If there is no way to make them work, I'll have to pay a restocking fee. The high fender is an option.

    By the time I get this figured out, I could probably have bought a GS and just lowered it to R height.:cry
    #12
  13. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    You original post seemed to imply you needed a low fender, so you sent me off on a wild goose chase. What you want is the high fender and a fork brace allowing a 19" front wheel, right?

    Going to a 19" wheel is the wrong way to go about this, I am not even sure it'll fit. It certainly leave an even lesser (but shorter) gap. I think you can use the R100R brace without the 2 pieces of low fender. Run two stainless steel brake lines up from each caliper to the lower triple tree and place a 1-to-2 brake line distributor there. That gets the brake line crossover out of the way and cleans up the asymmetry of the stock R100R front brakeline setup. The you need to look at the bottom of your lower triple tree and see if you can add 4 threaded holes to accommodate a high fender. An Acerbis Baja or NOST will do the job and allow custom mounting holes.

    This is how I would approach it. Cost would be about $100 for brake line material and $50 for the fender shipped.

    [​IMG] [​IMG]
    #13
  14. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA

    My preference is the GS low fender to maintain a near stock look. Something about the high fender and low muffler just doesn't work for me. The GS fork brace is desired because it actually screws to the forks as opposed to the R brace which fits into rubber gromets in the mounting holes and is held in place with little push-on clips. The 19" rim is so I can have a greater selection of front tires made for DS use. The R1100GS rim is a 2.5X19 40 spoke rim; mine is a 2.5X18 40 spoke rim. There is currently 1" space between the top of the tire and the brace. The choke point for mud is the ears of the fender which extend down the fork a couple of inches on both parts leaving a clearance of only 1/4" between the tire and the fender. The R brace is a cast piece approx 1" thick. The GS brace *should* easily give me the clearance I need for the larger diameter rim. The distance between the forks of the R should be the same as the GS. Providing the mounting holes for the brace on the forks are close, I can probably make it work. The parts guy at the dealer thought it would fit. Ideally, I will not have to drill and tap holes in the lower triple for either a fender or brake lines.

    My apologies for sending you off on a wild goose chase. I hope no wild geese were harmed in the pursuit of my education.:D

    Edit: I just looked at the enlarged pic of your fork brace. It secures where the ears of my fender currently do. I see you have the same side clearance problem I'm trying to cure. It doesn't look like we have the same sliders. Mine have the ears fore and aft at the top, like my PD had, for the brace.
    #14
  15. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    Now I sent you on a goose chase :evil The pictures are from a 198x R100 that was (ab)used to play in the mud on the TAT ... it was only included to illustrate what will happen! We had to take the fender off to be able to carry on!

    Not sure why you don't like high fender and low exhaust:

    [​IMG]

    Admitted, the R100R exhaust looks better "chrome-relieved" showing its real face, a small-ish stainless steel exhaust saving 4.5lbs.

    I still don't believe a 19" will work to your personal satisfaction, but you're welcome to prove me wrong :D.
    #15
  16. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    I read through your "modification" story on your bike.:bow I don't plan on going *nearly* as far as you did.

    I am curious as to why you think the 19" rim won't satisfy me. I'm looking at it as a compromise between the ultimate 21" and the less than optimal 18" rim. Before I undertake the changeover, it'd be nice to hear your thoughts.

    Removing the chrome cover from the muffler does have a profound effect on the "look" of the muffler. If the low fender isn't satisfactory or won't work and I do wind up with the high fender, I'll follow your lead on this.

    As with any project of this nature, everything is a compromise. One of my main parameters is to maintain, as close as possible, the ergonomics of the 100R. As it sits, the bike fits me extremely well. The goal is to have a bike that will handle the unpaved roads, which I enjoy riding, but still be able to comfortably cruise on the pavement when its time to get home.

    Thanks for your input.
    #16
  17. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    There are tire height variations (part of the aspect ratio of the tire) but also design and manufacturing tolerances to consider. Also, knobbies are larger in diameter than the size promises. Tires can vary much. TKC80 rear wheels for example: some can mount them right away, others need to cut knobs ... for the same tire size.

    Who or what gave you the impression that 19" is a "regular" DS front wheel size? Why would an 18" front wheel be less than optimal? With respect to what?

    I am seeing plenty of excellent 18" dual sport tires (Dunlop D606, TKC80, Metzeler Sahara 3, just to name a few), and fewer good 19". Just go through the dual sport tire selection at SWmototires and you'll see what I mean. Not even Kenda offers a 19" front wheel (just to go to the other side of the tire quality spectrum).
    I just don't think that you gain much if anything going from a 18" to a 19" front wheel.
    #17
  18. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    Stephen, have you had any problem with running a rear tire on the front by mounting it backwards?
    #18
  19. StephenB

    StephenB G(/)S ... what else!

    Joined:
    Aug 24, 2005
    Oddometer:
    2,044
    Location:
    Ontario
    Never ran a rear tire on the front backwards.
    #19
  20. Martian

    Martian Long timer

    Joined:
    Sep 20, 2007
    Oddometer:
    1,104
    Location:
    Elmdale, Kansas, USA
    I asked because many of the tires you mentioned are listed as "rear" tires. I've never used a rear on the front, either, but I have read that that is what a lot of R100R riders do. The 19" rim may not have the front tire selection that's available for the 21" rim, but it does have a couple, like a Metzler Tourance and Mefo's Explorer. The F650GS uses a 19" front tire as does the R1100GS. My thinking is being able to get a designated front tire has to be an advantage to running the 19" rim.
    #20