The 990 and wheel sizes

Discussion in 'KTM 950/990' started by Window_licker, Apr 30, 2006.

  1. Window_licker

    Window_licker n0b

    Joined:
    Apr 29, 2006
    Oddometer:
    233
    Location:
    Blackpool UK.
    Flash floods and dangerous driving in Scotland predicted, much safer tinkering in your garage:evil

    Have a nice break. :freaky
    #21
  2. Window_licker

    Window_licker n0b

    Joined:
    Apr 29, 2006
    Oddometer:
    233
    Location:
    Blackpool UK.
    Rob

    Have you tried the wheels yet?
    #22
  3. ROADCAPTAIN

    ROADCAPTAIN ROADCAPTAIN

    Joined:
    Jun 15, 2006
    Oddometer:
    93
    Location:
    Essex England
    Window licker have you changed your wheels yet?
    I have tried them and they work fine. even better on my SE
    Stop messing and get on with it.............RC.:lol3
    #23
  4. Window_licker

    Window_licker n0b

    Joined:
    Apr 29, 2006
    Oddometer:
    233
    Location:
    Blackpool UK.
    I was waiting for Rob as he has a spare set of wheeels before I jump in. Its the ABS thats the concern RC, Im not sure what will happen as KTM have said you can't do it as it will affect its operation.
    #24
  5. Dare2fail

    Dare2fail Been here awhile

    Joined:
    Dec 18, 2005
    Oddometer:
    281
    Location:
    West Lothian, Scotland
    I missed this thread the first run through. I looked into 17 inch wheels when I first got my 950 and KTM advised against it. I think it is purely for litigation purposes AND that they sell the 950sm which is in effect a 950adv with supermoto wheels (yes, I know I am oversimplifying this). Personally I don't see how it could effect the ABS as surely different tyres have a different rolling radius and you wouldn't expect your ABS to fail if you ran with different tyres....hell, the wheel radius will change slightly due to tyre wear although it would be minimal.
    #25
  6. woody's wheel works

    woody's wheel works Built to Last

    Joined:
    Jun 24, 2004
    Oddometer:
    3,572
    Location:
    39*40'33.86N 104*59'54.69W
    i do not know of any ABS system that is tied into rolling circumference/tire diameter,,,,

    FYI,,,the computer receives the data of the frequency of the little pulses that the sensor/pick-up unit senses when the abs ring with its little serrations/notches passes by,,,,,...it constantly correlates that with what info it has been receiving from the front and rear wheels,,,,when you apply pressure to the brakes it monitors the rythm of your front and rear wheels,,,,,should that rythm be interrupted by a lock-up/skid....it automaticallly releases pressure on that wheel and re-applies it moments later after the tire had a chance to turn/re-grip the surface..setting up a new current rythm ,,,when that gets broken,,,brake release and ,,,Voila!!!!,,,, it does that over n over again in rapid fire sequence...only quitting when the 'rythm is steady again,,,,,end result : better usable braking

    i have test driven all the cars and motorcycles we placed modified wheels on...narrow ,,wide,,,slicks,,,dual sport tires knobbies,,,it is irrelevant,,,,all that happens is that the ABS kicks in sooner or later depending on the grip

    it is a traction-no traction sensing system

    i do not believe the KTM ABS system would be any different,,,,i have not been on a KTM ABS equipped bike,,,,it would be easy enough to check,,,find a safe place to test and jam on the brakes,,,it is not rocket science!!!!
    #26
  7. plodder

    plodder Adventurer

    Joined:
    Dec 26, 2006
    Oddometer:
    14
    Hi All,
    Can someone put some pictures and a guide on UK prices on he forum re. rims/tyres. Been interested in doing the same myself.

    Thanks.
    Plodder
    #27
  8. stickysidedown

    stickysidedown Been here awhile

    Joined:
    May 8, 2006
    Oddometer:
    661
    Alright fellas, one of you do the swap, penny to the pound it makes no difference to ABS and wtf anyway, you have ridden bikes without ABS before!

    I will gladly test ride your mounts even as I'm feeling fragile with a few spinal breaks mendin at the mo.

    hoping for a new adv round march time (waiting on house sale) . as new model is out there any info on whats new this year? heard something about power skt but thats all
    #28
  9. mcmann

    mcmann Adventure Rider Junkie Supporter

    Joined:
    Nov 17, 2006
    Oddometer:
    3,897
    Location:
    Jefferson, GA
    I just received the below road tire set - - - highly recommended by a very experienced rider. Thought I would try before spending big bucks!
    <TABLE height=252 cellSpacing=0 cellPadding=2 width=500 align=center border=0><TBODY><TR><TD colSpan=2 height=23>
    Avon AM26 Road Rider

    </TD></TR><TR><TD vAlign=top width=152 height=181>[​IMG]</TD><TD vAlign=top width=469>Avon’s new Road Rider tire gives riders the four things they care about most; durability, grip, precise handling and performance. The performance of the Super Venom and the mileage of the Road Runner.
    • All-weather tire designed to deliver value and performance to riders of traditional and commuter machines.
    • Factors such as the tire's ability to resist whitelining led to the design of a unique central groove in the tread.
    • Advanced casing design to give low rolling resistance and positive feel.
    • Multi-arc tread profile that forces the biggest possible contact patch onto the road, whatever the lean angle.
    • Light and precise handling, while moving at slow speeds through traffic
    • AVON AM26 ROADRIDER 150/70-18 RR
      AVON AM26 ROADRIDER 90/90-21 FRT
    • Less than $80 ea.
    http://www.mawonline.com/avon.htm#Tires%20street
    </TD></TR></TBODY></TABLE>
    #29
  10. mcmann

    mcmann Adventure Rider Junkie Supporter

    Joined:
    Nov 17, 2006
    Oddometer:
    3,897
    Location:
    Jefferson, GA
    Front AM26 Roadrider installed. This tire has plenty of tread for the curves.
    I think I will wear out the back before installing the matchging rear AM26.

    Attached Files:

    #30
  11. cpmodem

    cpmodem Orange Caveman

    Joined:
    Nov 29, 2004
    Oddometer:
    7,130
    Location:
    masa yee yah tee 59° 14' 9" N / 135° 26' 42" W
    Very interesting mcmann. Do let us know your impressions on these tires as you wear them in.
    Thanks...
    -cp
    #31
  12. SamM

    SamM Jeep Overlander

    Joined:
    Nov 1, 2004
    Oddometer:
    1,478
    Location:
    West Virginia
    Does that come in a 19" front?
    #32
  13. mcmann

    mcmann Adventure Rider Junkie Supporter

    Joined:
    Nov 17, 2006
    Oddometer:
    3,897
    Location:
    Jefferson, GA
    This is MAW's listing:

    Order # Price........ Description......
    (42705) $65.95 Avon AM26 Road Rider 120/80-16 Front/Rear Tire Mfg.#: 2288413 [​IMG]
    (42706) $64.95 Avon AM26 Road Rider 100/90-18 Front/Rear Tire Mfg.#: 2283013 [​IMG]
    (42707) $74.95 Avon AM26 Road Rider 110/80-18 Front/Rear Tire Mfg.#: 2289413 [​IMG]
    (42708) $74.95 Avon AM26 Road Rider 110/90-18 Front/Rear Tire Mfg.#: 2287013 [​IMG]
    (42709) $64.95 Avon AM26 Road Rider 100/90-19 Front/Rear Tire Mfg.#: 2289013 [​IMG]
    <HR>(42710) $80.95 Avon AM26 Road Rider MT90-16 Rear Tire Mfg.#: 2270313 [​IMG]
    (42711) $98.95 Avon AM26 Road Rider 150/80-16 Rear Tire Mfg.#: 2277413 [​IMG]
    (42712) $64.95 Avon AM26 Road Rider 120/80-17 Rear Tire Mfg.#: 2274813 [​IMG]
    (42714) $65.95 Avon AM26 Road Rider 120/90-17 Rear Tire Mfg.#: 2278613 [​IMG]
    (42715) $68.95 Avon AM26 Road Rider 130/70-17 Rear Tire Mfg.#: 2279913 [​IMG]
    (42716) $72.95 Avon AM26 Road Rider 130/80-17 Rear Tire Mfg.#: 2275913 [​IMG]
    (42719) $79.95 Avon AM26 Road Rider 130/90-17 Rear Tire Mfg.#: 2275713 [​IMG]
    (42720) $74.95 Avon AM26 Road Rider 140/70-17 Rear Tire Mfg.#: 2277613 [​IMG]
    (42766) $100.95 Avon AM26 Road Rider 140/80-17 Rear Tire Mfg.#: 2279213 [​IMG]
    (42767) $76.95 Avon AM26 Road Rider 150/70-17 Rear Tire Mfg.#: 2275113 [​IMG]
    (42768) $79.95 Avon AM26 Road Rider 4.00-18 Rear Tire Mfg.#: 2276813 [​IMG]
    (42771) $66.95 Avon AM26 Road Rider 120/80-18 Rear Tire Mfg.#: 2279513 [​IMG]
    (42772) $79.95 Avon AM26 Road Rider 120/90-18 Rear Tire Mfg.#: 2276013 [​IMG]
    (42774) $64.95 Avon AM26 Road Rider 130/70-18 Rear Tire Mfg.#: 2276613 [​IMG]
    (42775) $95.95 Avon AM26 Road Rider 130/80-18 Rear Tire Mfg.#: 2279813 [​IMG]
    (42776) $107.95 Avon AM26 Road Rider 140/70-18 Rear Tire Mfg.#: 2279713 [​IMG]
    (42777) $78.95 Avon AM26 Road Rider 150/70-18 Rear Tire Mfg.#: 2276513 [​IMG]
    <HR>(42779) $79.95 Avon AM26 Road Rider 100/90-16 Front Tire Mfg.#: 2268313 [​IMG]
    (42780) $82.95 Avon AM26 Road Rider 110/90-16 Front Tire Mfg.#: 2268213 [​IMG]
    (42781) $56.95 Avon AM26 Road Rider 100/80-17 Front Tire Mfg.#: 2260213 [​IMG]
    (42782) $60.95 Avon AM26 Road Rider 110/70-17 Front Tire Mfg.#: 2265213 [​IMG]
    (42783) $62.95 Avon AM26 Road Rider 110/80-17 Front Tire Mfg.#: 2265513 [​IMG]
    (42785) $64.95 Avon AM26 Road Rider 120/70-17 Front Tire Mfg.#: 2266113 [​IMG]
    (42786) $57.95 Avon AM26 Road Rider 90/90-18 Front Tire Mfg.#: 2269913 [​IMG]
    (42787) $65.95 Avon AM26 Road Rider 3.25-19 Front Tire Mfg.#: 2267513 [​IMG]
    (42790) $63.95 Avon AM26 Road Rider 90/90-19 Front Tire Mfg.#: 2268813 [​IMG]
    (42794) $75.95 Avon AM26 Road Rider 90/90-21 Front Tire Mfg.#: 2268113 [​IMG]
    #33
  14. cpmodem

    cpmodem Orange Caveman

    Joined:
    Nov 29, 2004
    Oddometer:
    7,130
    Location:
    masa yee yah tee 59° 14' 9" N / 135° 26' 42" W
    WOW! Those are some inexpensive treads. I wonder why the 140/70-18 is so much more expensive :eek1
    -cp
    #34
  15. mcmann

    mcmann Adventure Rider Junkie Supporter

    Joined:
    Nov 17, 2006
    Oddometer:
    3,897
    Location:
    Jefferson, GA
    I found some more info (attached).
    Plus, here is a AM26 report from Window licker:

    http://www.advrider.com/forums/showthread.php?t=135181&highlight=am26

    <!-- / message -->

    Attached Files:

    #35
  16. Pressurized

    Pressurized exit GS, enter KTM

    Joined:
    Nov 11, 2004
    Oddometer:
    127
    Location:
    East of England
    There are two issues here.

    First is legal. UK insurers will take a very dim view if non-homologated parts are fitted that could affect safety. If the bike is involved in an accident, they are legally able to walk away. Even if the accident isn't due to lack of ABS or whatever, it's difficult to envisage any accident where insurers couldn't say the accident might have been avoided if the 'correct' parts had been used.

    Second is technical and in spite of what's been said above, it's entirely possible that the ABS could be confused by different diameter wheels. A wheel 19" in diameter rotates 10% faster than a 21" one (assuming tyres sizes change in proportion). That's quite a difference. AFAIK ABS systems work by comparing front and rear wheel speeds so significant relative differences between front and rear expected speeds may well put the system into fault mode if the brakes aren't on at the time.

    If the front wheel size is changed in proportion to the rear then the relative speeds of the wheels remain the same so the system would likely stay unconfused.

    It may be possible to change the slotted disc on the wheel so that it compensates for the change in wheel size. I.e., if the OEM disc has N slots, the one for the 19" wheel would have N x 19/21. But remember that the actual number of slots can't be a fraction and, while the ABS system will have a tolerance band on 'allowed' relative wheel speeds (to account for tyre wear), the changes may still leave the relative speeds outside the zone and put the system in fault.
    #36
  17. Window_licker

    Window_licker n0b

    Joined:
    Apr 29, 2006
    Oddometer:
    233
    Location:
    Blackpool UK.
    Or you could just pull the ABS fuses :wink:
    #37
  18. cpmodem

    cpmodem Orange Caveman

    Joined:
    Nov 29, 2004
    Oddometer:
    7,130
    Location:
    masa yee yah tee 59° 14' 9" N / 135° 26' 42" W
    Easier than that. Just flip off the switch.
    -cp
    #38
  19. fixinbones

    fixinbones Tarmac Adventurer

    Joined:
    Feb 6, 2005
    Oddometer:
    2,012
    Location:
    New York
    Has there been a resolution to this inquiry on on 990 ADV wheel swap.
    #39
  20. Window_licker

    Window_licker n0b

    Joined:
    Apr 29, 2006
    Oddometer:
    233
    Location:
    Blackpool UK.
    Works great for me :clap
    #40