New and improved KTM690 WUNDERFEST

Discussion in 'Thumpers' started by crankshaft, Sep 6, 2011.

  1. Sutherngintelmen

    Sutherngintelmen around the bend

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  2. dad2bike

    dad2bike Retired! Cranky Old Fart

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    Thanks much.

    Sent from outer space with my Thunderbolt with Tapatalk.
  3. motoged

    motoged Been here awhile

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  4. Albie

    Albie Kool Aid poisoner

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  5. Seth S

    Seth S Will _____ for _____

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    I have used a rig similar to the one above but with one bead breaker....very handy for changing mousse.
  6. dad2bike

    dad2bike Retired! Cranky Old Fart

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    Has anybody got experience will running smaller rear tires (knobbie) on the 690?
    I don't want to get into a tire brand discussion, just a size question.
    The tires I run on my 525 are 120/100-18. The next size is the 140/80-18. I was thinking if I dropped down to the 120 I might just be able to keep the lowering link installed and not hit the tank.
    Thoughts? :ear


    Another thought- I haven't noticed any posts or threads about drilling the drain holes in the 690 swing arm. Isn't this an issue with them as with the rest of the KTM line?
  7. RoninMoto

    RoninMoto Wanderer

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    I have a 130/80-18 on the rear right now. I prefer the big ol' 140/80. You need to get that power to the ground!:deal

    I'm not familiar with the swing arm problem you talk about.. they fill with water?
  8. Seth S

    Seth S Will _____ for _____

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    I ran the Kenda trakmaster II on the rear in a 120/100-18 for a little over 1000 miles without any issue. The tire worked fine, no rim issues, no abnormal wear issues and I was on dirt and pavement. In the woods the narrower tired hooked up almost as well as a trials tire...it was very impressive. I also have run a trials tire on the rear with no issue.
  9. motoged

    motoged Been here awhile

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    Tars...

    130/80 vs 130/100.....the first number is the width of the tire and the second is the height relative to the width is what I think these numbers represent....if this is true....the "100" would be a taller sidewall.....

    n'est pas?


    And , yes, the EXC swingarms can take in water and it is a good idea to drill a 1/8 hole in the bottom of each swing arm a few inches from the back end....and check the holes occasionally as they can get plugged.
  10. Seth S

    Seth S Will _____ for _____

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    I currently have 3 rear wheels and really only need 2. I have a wide and a narrow. The wide is an adapted 640 wheel as my stock rear rim got trashed through normal riding. The stock rear hub was superlaced with an excel rim. I also have a new Rad rear wheel..both the rad and the stock/excel are unused and i would like to sell one. I will put an ad up in the flea market in the next day or two but figured i would post a heads up here. Both of the Excel wheels are 1.85 wide iirc...good for offroad tires...not so good for fitting rally mousse :cry

    I am trying to scratch some cash together to aid in a house down payment
  11. crankshaft

    crankshaft Guns are for pussies

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    R U sure? I have a 100/100 rear and the sidewall is really short.
    The 100/80 has a taller sidewall.
  12. Seth S

    Seth S Will _____ for _____

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    same brand of tires? I have seen differences in heights between brands. should be width/(height as percenty of width) - diameter.
  13. Albie

    Albie Kool Aid poisoner

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    It's amazing the discrepancy in sizes between brands.
  14. dad2bike

    dad2bike Retired! Cranky Old Fart

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    I found this. http://www.ehow.com/how_4841621_determine-motorcycle-tire-size.html
    It seems a 120/100 would be 120mm tall and a 140/80 would be 112mm tall.
    I guess the 140/80 would shorter.
    I guess I could go for 100/100. That would surely give clearance.
  15. dad2bike

    dad2bike Retired! Cranky Old Fart

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    What about the 690 swingarm?
    I know we drill 950/990 swingarms too.
  16. Seth S

    Seth S Will _____ for _____

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    The 690 arm has some opennings in it as I recall...which makes me remember that I might have some stuff hidden in mine...hmmm better go have a look. I do recommend pulling out the adjuster bolts and coating them with copper anti-seize
  17. dad2bike

    dad2bike Retired! Cranky Old Fart

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    Oh heck yeah. I do that to all my swingarms. I learned my lesson way back on a 1980 Husky swingswing arm. :cry
  18. DirtJack

    DirtJack Adventurer

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    I run Michelin T63's on my knobby wheels. The rear is 130/80. Works well and they are cheap.
  19. Pantah

    Pantah PJ Fan from Boston

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    Yes your are correst. The first number is the width and the second number is the height expressed as an aspect ratio of the width.

    90/90/21 says the width is 90 and the height is 90% of the width.

    At least that is what the tire section of motorcycle-superstore.com says. :D
  20. DirtJack

    DirtJack Adventurer

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    The size 120/100 gives the width (120 mm) and height (120) as a percentage (100%) of the width. On a 140/80, the height would be 80% of 140 or 112. Changing tire aspect ratios can alter speed/distance measurements particularly if the change is on the wheel used for measurements.