F800GS: Anyone done 17" front?

Discussion in 'Parallel Universe' started by Steffo, Dec 3, 2009.

  1. The Griz

    The Griz Long timer

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    The F800GS is not built as a supermoto bike, so how do you get your above statement from my statement "the F800GS is a big dirt bike"?

    Of course supermoto bikes are not just "dirt bikes". I never said that. :lol3 But my point was that the F800GS was designed to live as a big dirt bike, not a supermoto bike. For the amount of money you throw into a the F800GS to get it supermotarded, you might as well just buy an actual whole used separate supermoto bike:

    http://www.kawasaki.com/Products/Product-Specifications.aspx?scid=14&id=417

    17" Excel front wheel
    new front brake rotors for Excel wheel
    supermoto tires
    revised front forks to accomodate the smaller 17" wheel

    You're talking thousands. Not to mention the fact that it will screw with the ABS sensor and computer. Yay.
    #21
  2. Steffo

    Steffo Been here awhile

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    I know a place where I can get a complete 17" front wheel, to which the stock brake rotors fit, and brake caliper adaptor for 1000 Euros but I suppose you do have a point. I would have to make something about the front suspention as well. Damn it. Why can't it ever be cheap and easy?

    :freaky
    #22
  3. The Griz

    The Griz Long timer

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    Shit, man. Now I feel bad! Didn't mean to burst your bubble. Just trying to be realistic for ya.
    #23
  4. CajunRider

    CajunRider Been here awhile

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    Wow... someone wants to modify their bike and people are getting upset??? What's this world coming to?!?!?!?!?!

    Look... dude... bottom line... it's YOUR bike, so set it up the way YOU want it!!! Those who don't like it can suck a rotten egg cause it ain't THEIR bike!!! :deal

    Now... 21" to 17" is fairly drastic... you'll prob need to either extend the forks (EXPENSIVE) or lower the back (1/4 the price of extending the forks). Lowering the back can be done with a few new links. I'd go that route.

    Now... I seen to remember (I may be wrong here) that the F800GS had an 18 inch rear wheel??? If it IS an 18 inch rear, I'd go with an 18 inch front also... it'd be a MEAN flat tracker!!!

    My advice (worth as much as you've paid for it)... get some frame guards in case of a crash, and do a few track days with the 21" front. If you really enjoy it, change the front rim to the same size as the back rim, possibly with lowering links on the back to compensate.

    Then get out there and enjoy YOUR bike!!! :clap
    #24
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  5. CajunRider

    CajunRider Been here awhile

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    Oh yeah... almost forgot...

    Post some picks of it when you're done!!
    #25
  6. The Griz

    The Griz Long timer

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    The 8GS has a 17" rear wheel and doesn't use a "linkage" in the rear. To lower the rear on this bike, you'd have to get either a Hyperpro spring lowering kit, or a new rear shock with adjustable height. Elka makes an adjustable height rear shock for the F800GS now: http://www.elkasuspension.com/?q=node/45
    #26
  7. ]I)Money

    ]I)Money D NOT I

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    Your possible lowside on a track isn't any more potentially expensive than me or others dropping the bike on a trail. As far as the POTENTIAL ABS issue goes, I'm not convinced that the computer can't compensate; it already has to deal with different rotational rates depending on the tire mix you are running (granted, it is more extreme). Besides, you wouldn't run a track day with the ABS on, anyway, would you?
    If you get a 100 euro wheel, and don't like it, you can probably resell it for not too much loss, besides. And I want to see the pictures, too!
    #27
  8. The Griz

    The Griz Long timer

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    I am positive the F800GS computer is programmed for a 17" rear wheel and a 21" front wheel. When you switch the front 21" for a much smaller 17" wheel, the smaller diameter of the wheel will in turn make it rotate considerably faster. This considerably faster spinning front wheel will confuse the ABS system. The computer in the F800GS is static, not dynamic. It doesn't "compensate", and it could be life threatening if you leave ABS on. I don't recommend it.

    As an example: My buddy that has a 2007 Chevy Silverado just put larger tires on the rear and a bit smaller ones on the front to give it that "old school" look. Completely wigged out the ABS sensors, and his dashboard ABS alarm goes off constantly now. He called his Chevy dealer and they said it would be $200 to reprogram the computer to handle the tire size difference. If the far more advanced automobile computer control systems in a new Chevy can't handle a tire size change...the simple solid state computer module on the F800GS motorcycle definitely won't.

    That aside, I do know that the F800GS won't dynamically handle a wheel size change.
    #28
  9. WoodWorks

    WoodWorks House Ape

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    I'm not saying you aren't right about that, Griz. I don't know. But the list of things that you've been "positive" about here that turned out to be not so is long and legendary.

    Feel free to demolish my disbelief with data. :wink:

    David
    #29
  10. Rick West

    Rick West Function not Farkles

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    Somewhat off topic, but has anyone converted a Wee-Strom to a 17" front wheel. That would seem to play into it's strength as a streetbike.
    #30
  11. The Griz

    The Griz Long timer

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    I don't think "long and legendary" is quite accurate there, WoodWorks. There have been a few things on this forum that I thought I was right about, and was then proven otherwise, yeah. But that's the case for everyone here including, godforbid, you. And quite frankly, my neck is sore from looking up at you on your high horse preaching down at people.:gerg
    #31
  12. bxr140

    bxr140 Flame Bait

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    First, that's not a great assumption on your part.

    Second, it wasn't actually a insult, if it matters. Everybody is a noob at some point. My first crash was at my first trackday, in the slow group, on a 600...and was 100% the result of too much speed and too little skill. I eventually progressed up to A group pace, and even then I didn't want any more power than my [2001] CBR 600 had. 130 mph might not seem like much out on an open road, but on a track it is STUPID fast, thankyouverymuch. :deal :wink:

    Third, note that I'm a California trackday snob. I'm of the impression that if you can't lap in the A group, you shouldn't have a 1000cc bike on the track, period. Anything with more than 70-80hp or so is not a good idea for a track noob, IMHO.

    Bottom line though, it comes back to finances. If you can't afford to buy an inexpensive trackbike, you simply can't afford to spend the better part of what a trackbike costs to modify your expensive road bike for the track.
    #32
  13. ]I)Money

    ]I)Money D NOT I

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    You may well be correct, but you are still speculating. Besides, like I asked earlier, you wouldn't run a track day with the abs on, would you?
    #33
  14. Gustavo

    Gustavo Motociclista Errante

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    I find this thread developing in an intriguing way. Some of the same riders that in other threads claim the F800GS as the best motorcycle known to man :bueller jumped all over this guy for suggesting he was going to take his bike to a track day or don't seem to think it will can be taken to a track day and have an enjoyable day out. Weird. :scratch


    Gustavo
    #34
  15. afmracer

    afmracer Been here awhile

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    I'm simply saying there are better candidates for a 17" wheel conversion. But if you have 2 grand burning a hole in your pocket, do it! and post some pics and a vid!!
    #35
  16. Throbbing Missile

    Throbbing Missile Stuck in a rut

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    Fuck me there's some big girls in here! :rofl

    If you could get a second hand front wheel then the UK wheel building places would charge about 300Euro ($400ish) tops to lace a new 17" rim with new stainless spokes to the existing hub. You could always save cash by lacing it yourself, it's not that hard. You don't NEED and Excel rim, a cheaper Morad would be fine. Keep the standard front and you can always change back.


    It'll either work or it won't. Nothing ventured, nothing gained.

    None of my projects and modified bikes would have got anywhere if I worried myself like some of you guys!
    #36
  17. garandman

    garandman Wandering Minstrel

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    Rent. I rented a well set up Ducati 900ss for $250.

    Otherwise, some track day events are pretty mellow and you can just go out and do your best, have fun and don't worry about it.

    It's fun regardless of what you are riding. Actually the V-Strom acquits itself surprisingly well.

    [​IMG]
    #37
  18. Wanderer1

    Wanderer1 Tuesday

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    Loudon, turn 2?

    Took the GS up there this year. All kinds of fun :)
    #38
  19. llamapacker

    llamapacker Mr. Conservative

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    Okay, I love DIY mods, so this gets my attention.

    The F800GS is listed as 26 degrees on rake, replacing the 21" with 17" will change the rake to like, maybe 24 degrees are there abouts. Pretty good for a track bike wanne be. The Buell is like 21, Tiger 1050 23.

    I hate spending money on a one time deal, so I would most likely just take it to the track stock, keeping in mind we are not going to set any speed records.

    Actually the soft suspension if stable makes for more forgiveness on the track up to a point. The front dive helps to plant the front to give maximum braking and stays compressed when turning in.

    P.S. Oh, and when I went to the track (actually ridesmart) one of our gals on an F800ST ran like the wind, I had to get close in a turn then outlast her down the next straight till brakes to get by, and my Tiger is FAST! :-)

    P.S.S. As for the ABS, not sure what will happen with the wheel change, but I can tell you what will happen on the F650GS (twin) and new 150/60/17 rear tire replacing the stock 140/80/17, ABS will shut off. This tire size is 1.8" smaller Dia.
    #39
  20. Steffo

    Steffo Been here awhile

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    You might say that I am a slow starter but I have finally done it.

    17" Excel rim with a stock hub. I'll post a pic of the wheel mounted as soon as possible. (Hopefully not two years this time, eh?)

    Attached Files:

    #40