more gear please

Discussion in 'Thumpers' started by Loadedagain, Apr 22, 2005.

  1. Loadedagain

    Loadedagain making chips

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    dear sirs,

    cruising along this morning going 145km/hr i think (like i do every morning) that another gear would be ever so nice. watching the tach at 7 doesn't give me the warm fuzzies at all. so whdaya think? should i take out my reverse gear and change it into another forward? dat'd be really nice. what tooth combenation would be best to give me a 150km/hr cruise speed at around say 6 on the rev ticker.

    love, loady
    #1
  2. BlitzBike

    BlitzBike LC4 Pilot

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    Yeah, I hear you. That is the one LC4 issue that I find it hard to believe has not been addressed by KTM over the years (a 6th gear). I have relegated myself to running a 17T C/S for highway which gives about 93 indicated or 86MPH GPS @6,000RPM and if I'm gonna do single track, I can just flip the swing arm adjuster plates around and pop in a 15T without having to do any chain adjustments. I have not tried the 15T on this particular bike but, I figure you lose about 5-6 MPH top end for each tooth you go down on the C/S. So that should top out at about 74 MPH with the 15T.
    Only down side with the 17T is you are stuck in first on trails and sometimes with strong head winds its hard to get the bike to get to 6,000 RPM.
    Much smoother for highway and I'm not over reving for passing ( I try to keep my RPMs at or below 6,000 RPM usually the sweet spot is between 5,500-6,000)
    #2
  3. Max Power

    Max Power Secret Agent

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    145. Was that down hill with a tail wind. :flip

    This CHART should work. All you need to change is the primary and 5th gear drive ratio's,
    max rpm (6000) I would say tire size is close enough and then just play with the front and rear sprocket no's to get yer speed.
    #3
  4. Max Power

    Max Power Secret Agent

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    Ok then.

    Curious, can someone look in there manual and tell me what the primary drive ratio and 5th gear ratio is.
    #4
  5. BlitzBike

    BlitzBike LC4 Pilot

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    Yeah, since 5th gear never gets used off road, why not make it a super tall highway gear?
    #5
  6. Mack

    Mack Gone, but never forgotten. RIP, Mack...

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    1st Gear M/s 14t X 1st Gear C/s 35t
    2nd Gear M/s 15t X 2nd Gear C/s 24t
    3rd Gear M/s 18t X 3rd Gear C/s 21t
    4th Gear M/s 20t X 4th Gear C/s 19t
    5th Gear M/s 22t X 5th Gear C/s 18t

    Primary 30:81
    #6
  7. meat popsicle

    meat popsicle Ignostic

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    Mack makin it look easy again! :thumb

    somebody did the leg work on this and its a no go right? no room for a sixth and i thought no room for a taller highway gear. but the second part is less definate.

    did you change yer sprokets deary?
    #7
  8. Loadedagain

    Loadedagain making chips

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    ok.... 5th gear is 22:18 which gives a ratio of 1.2

    it has stock sprockets on it whatever that means... ktm lists front - 14 - 15 - 16 - 17. and rears of 38 - 40 - 42 - 45 - 48 - 50 - 52... since i haven't gone and counted mine i aint sure what it is (anyone know what they adventure stock ratio is?) ... think i'm goona buy a set of 17 - 38's for my street wheels..

    does the 17 tooth front have any clearance issues? :ear
    #8
  9. Arch

    Arch Incurable Gearhead

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    I simply added fang on the front and dropped two off the rear. This combo allows the chain length to work with both gearing options, stock/dirt and cruise friendly, if that matters.

    So..
    Stock/dirt = 16/42
    Cruise = 17/40

    <!--StartFragment -->You'll need to take a belt sander to the removable case protector to fit the larger countershaft sprocket, or order up the one that they use on the duke (ktm part # 58430047000).
    #9
  10. Loadedagain

    Loadedagain making chips

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    there we go..... arch has the answers :clap

    what speed does she cruise at in top gear at 6 grand?
    #10
  11. Arch

    Arch Incurable Gearhead

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    Can't recall exactly 'cause I don't use it much outside of our desert excursions, but am riding to the shop this afternoon so I'll have a look and post back.

    :thumb
    #11
  12. meat popsicle

    meat popsicle Ignostic

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    did ya even try to look? :rolleyes

    #12
  13. GODSPEED

    GODSPEED finger lickin' good

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    Loaded my man, I'm glad you brought this up. I am missing one toof on my rear and it's time to change der sprocketz and chain.
    I had planned on replacing with:

    17:44 for street
    16:44 for dirt

    These ratios put it just below and above stock, respectively. I want to use a Stealth rear sprocket and the smallest I can find is a 44.

    Drive Guru's: Would I be able to run these combo's using the same chain and just make adjustments when I swap?
    #13
  14. gybeman

    gybeman Been here awhile

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    I use the 15T front sprocket a lot as I do as little pavement as possible. 5th at 5000rpm = 100kph or 62mph. (gps speed = speedo wheel size set to 19") It tops out at about 155kph.

    I can't imagine using a 17 offroad. Just above idle must be like 20mph.

    sorrys that with 15:42
    #14
  15. Arch

    Arch Incurable Gearhead

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    <!--StartFragment -->Just went and checked. With 17/42 and Pirelli MT21s, it's doing 85mph at 6k in 5th, give or take a couple mph depending on the wind. As a data point, it'll cruise at 60mph at about 4400 rpm.
    #15
  16. Loadedagain

    Loadedagain making chips

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    :thumb thankyou sir.
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  17. meat popsicle

    meat popsicle Ignostic

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    that matches what others have said.

    arch, godspeed has a question for you on the previous page. :D
    #17
  18. BlitzBike

    BlitzBike LC4 Pilot

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    If you are referring to that previous thread about the shorter first gear to get 6 gears...The guy that I believed told me about that later denied it to someone who I referred to him and it didn't go any further than that. So we're still gonna need a brave case splitter with gear know-how to investigate to get a definative answer.
    #18
  19. Arch

    Arch Incurable Gearhead

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    Yep, I just didn't know what rear BlitzBike was using, so I ran my 17/42 on up for curiousity's sake.

    Great! Another opportunity for foot in mouth insertion! :rofl
    #19
  20. ZZR_Ron

    ZZR_Ron Looking up

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    Ok colin, that's wierd..we are asking the same question about 2 different bikes, 3 minutes apart!!
    #20