The 990 and wheel sizes

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Window_licker, Apr 30, 2006.

  1. Window_licker

    Window_licker n0b

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    Picking up my 990 next wednesday. Ordered a set of 19" /17" rims to replace the standards as Im using it for on road touring only.
    Got an e-mail form my dealer saying KTM says no because of issues with the ABS and changing wheels. . My dealer doesn't really know why, thinking it could be a technical issue or an anti-litigation issue. I can live with the litigation line as I know how careful they have to be. Plenty of you 950 owners have swopped the wheels out with no problem, but if its a technical issue with the ABS then I guess this could put the block on my plan.

    What do you guys think, or preferably know :huh
    #1
  2. Mudguts

    Mudguts when in doubt GAS IT

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    i could be wrong but ABS computer will always think you wheel is a 21"Witch will make the ABS usless therfore the NO from KTM ,Unless there is a way to reprogram the computer?????,

    I belive the ABS work on wheel size and speed, bla, bla, bla

    It may be worth checking out to see if the ABS incoder is interchangable from
    the 950SM ???? not sure but you should ask questions are free .
    #2
  3. Window_licker

    Window_licker n0b

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    Thanks for the reply.

    Unfortunately the 950 SM doesn't have ABS so looks like I might be putting Bt45's on it in the hope of more grip
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  4. Window_licker

    Window_licker n0b

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    Woody

    I have seen a pic of Richards bike before, looks very nice. Unfortunately I just got this from KTM today:

    [SIZE=+0][SIZE=+0] as representatives of the manufacturer we cannot endorse any changes from the standard homologated model as offered for sale through our agents with the exception of recommended power parts as tested and recommended through our accessories division. [/SIZE][/SIZE]
    [SIZE=+0][SIZE=+0][SIZE=+0][SIZE=+0]With regard to your particular model the 990 Adventure with ABS please remember that the ABS has been designed and tested with bikes fitted with OE tyres and brakes, including brake pads and we cannot support any deviation from this on the grounds of both safety and stability.[/SIZE][/SIZE][/SIZE][/SIZE]
    [SIZE=+0][SIZE=+0][SIZE=+0][SIZE=+0]Ultimately it is your decision on whether or not you change the specification on your KTM but please be aware that we will not be able to support you should any issues arise as a result of any changes made by yourself or on your direction.

    Not exactly the answer I was hoping for, and still doesnt answer if the ABS system needs a 21" front to work.....
    [/SIZE][/SIZE][/SIZE][/SIZE]
    #4
  5. Joe Bar

    Joe Bar Middle England

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    Must say that looks exactly the response you would expect from any manufacturer. The cannot / will not condone any changes to homologated spec for safety / legal reasons.

    Makes absolute sense from their point of view, but gives you no information to work with whatsoever. Simple fact is, if they've not tested it, and the powers that be have not put their official stamp on it, TUV, E-Mark whatever, then they will not even un-officially say it is possible.

    Having been involved with the sale and importation of modified (new) vehicles in the past, I know this is a minefield for the manufacturers.
    #5
  6. Window_licker

    Window_licker n0b

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    bmk

    Yep, your right. I did ask though whether it was due to the ABS needing a particular wheelsize but it wasn't answered.

    I've come up with a plan. As my 950Sm is going and Ive just sold a 1200Gs I have enough money left over for a 64O prestige, that will do nicely for trips out on my own ( I think)

    Im on monomaniacs forum as Lloyd, guess every KTM owner's on every KTM forum :D
    #6
  7. Joe Bar

    Joe Bar Middle England

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    Sussed that :evil :evil
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  8. Joe Bar

    Joe Bar Middle England

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    Sussed that :evil :evil

    Very interested in the 19 / 17 combo for my 950 though.
    #8
  9. sakurama

    sakurama on an endless build

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    I would have to say that I can't imagine the wheel size affecting the ABS - theoretically the unit has a sender that pulses or releases the brake based on wheel speed change. The difference between the 21 and the 19 is nominal really. Here is your chance to make a great contribution to the board and KTM owners everywhere by taking the bull by the horns and getting a set of wheels made and trying it out. If it works and you don't notice any difference than you've empirically answered a question and cut through all the internet speculation and manufacturers lawyer speak. If it doesn't and you find the ABS give an error or doesn't work as well than you've solved a mystery for everyone. Help avoid the crime of internet speculation - do it for the children...

    It's not like there won't be about 1000 people that want to buy your wheels if they don't work.

    Give it a go - the sizes are perfect and if KTM had never considered it then the speedo wouldn't have an option for the 19 wheel size. If you ask them they'll also tell you to not take off the safety stickers and the emissions crap and always ride sitting up straight with both hands on the controls... take a chance here.

    Gregor
    #9
  10. Motomedic

    Motomedic Over-caffeinated Raconteur Supporter

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    I too doubt the wheel size could impact the ABS, as wheel speed is wheel speed, no matter how big it is. Yeah, the smaller one spins faster at a given MPH, but does the ABS know how fast you are going? My guess is no. It is most likely just sensing relative wheel speed, and modulating brake pressure if speed drops below a certain parameter (0 mph?).

    MHO :1drink
    #10
  11. bug

    bug bodger

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    It does not matter what wheel size you use,sensor monitors a rotor on left of hubb which is smaller diameter than disc so you could use 21/19/17 inch wheels without problem
    #11
  12. Terence FFM

    Terence FFM prof. cat-herder

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    It occurred to me that several companies in Germany offer 17/17 wheel kits for the GS12 (most notably AC Schnitzer). Given that nearly all GS12's sold in Germany have ABS (front AND side airbags coming out in 2008, ejection seats in 2009 :evil ) and that in Germany you need the TUV's approval to change nearly anything on a motor vehicle, I can only assume that KTM's reaction is a little overly cautious. Additionally, KTM's line about only the original Pirelli's being ok-ed for use with ABS equipped bikes is bunk since the Metzler and Conti have approved alternatives. I'm going to send an email off to AC to enquire about approval on ABS equipped bikes and will post the outcome here.
    #12
  13. Rob Stevenson

    Rob Stevenson Adventurer

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    After all the hype has anyone had the balls to swap to the 19"/17" Combo on their 990 Adventure.
    #13
  14. Window_licker

    Window_licker n0b

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    Rob

    I decided to just put stickier standard sized tyress on (Avons), lets bump this to see if anyone else has done it......

    Are you the same Rob that goes to Triple D in Kendal?
    #14
  15. Rob Stevenson

    Rob Stevenson Adventurer

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    window licker

    Thats me mate!

    Its not that man lloyd again is it ?
    #15
  16. Window_licker

    Window_licker n0b

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    :clap:freaky:clap
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  17. Rob Stevenson

    Rob Stevenson Adventurer

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    Hi Lloyd

    Yes its tempting ...guess it should be me as i have a set in the shed !!!.
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  18. Window_licker

    Window_licker n0b

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    Go fit them right now !
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  19. ROADCAPTAIN

    ROADCAPTAIN ROADCAPTAIN

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    Just remeber to fit the wheel sensors with the disc change over. the hub speeds can't change so where is the problem?....KTM
    #19
  20. Rob Stevenson

    Rob Stevenson Adventurer

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    Job for next week i`m afraid ...Am all loaded up fo a weekend in Scotland

    Will report back !
    #20