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Thread: Cogs & Sprockets

  1. #1
    Tyre destroying, mad bastard menace
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    Cogs & Sprockets

    I just swapped out a 15t front cog for a 17t and went for a spin. The bike feels like it has less pickup initially, once I get over about 4 or 5krpm I can't feel much difference.

    My initial thoughts were that the top end would make up for it ??

    Over a set distance the bike used to pull about 180ks in 4th looking for 5th, now it is pulling 190ish in 4th and still pulling hard.

    I'm just wondering will the extra speed amount to a quicker pass. I'm only talking 1/8th mile here too.

  2. #2
    Power Hungry, Law Disregarder
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    this might help.
    http://gearingcommander.com/

  3. #3
    Tyre destroying, mad bastard menace
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    I used that work out a few things before ordering the cog, I'm just wondering if speed will equate to faster times if that makes any sense to the drag racers out there.

  4. #4
    Bloke with a smaller stick BANDITROD's Avatar
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    when it comes to the crunch you are only going to be in 2nd or 3rd across an 1/8th mile anyway so i would gear it for pick up myself

    Glenn Eason drinks and smokes and lends his arse to other blokes

  5. #5
    ASF Gold Full Member Yella's Avatar
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    Mate I'm thinking the other way around taller gearing will mean that you accelerate slower.
    Better off accelerating as fast as you can. I would go smaller on the front
    But thats just me
    'Originally Posted by rock hard stock swingarms are for blokes with balls!! ha ha'



    I would love to become a professional whistler. I'm pretty amazing at it now, but I wanna get, like, even better. Make my living out of it.

    Yella turbo ZX7 Winner VCM Best Streetfighter and SOS encouragement award NFR 2011
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  6. #6
    ASF Gold Full Member Yella's Avatar
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    Fucking Banditrod the ninja
    'Originally Posted by rock hard stock swingarms are for blokes with balls!! ha ha'



    I would love to become a professional whistler. I'm pretty amazing at it now, but I wanna get, like, even better. Make my living out of it.

    Yella turbo ZX7 Winner VCM Best Streetfighter and SOS encouragement award NFR 2011
    http://www.streetfighters.com.au/for...-s-ZX7-project

  7. #7
    Bloke with a smaller stick BANDITROD's Avatar
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    a big fat one at that lol

    Glenn Eason drinks and smokes and lends his arse to other blokes

  8. #8
    ASF Gold Full Member Yella's Avatar
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    'Originally Posted by rock hard stock swingarms are for blokes with balls!! ha ha'



    I would love to become a professional whistler. I'm pretty amazing at it now, but I wanna get, like, even better. Make my living out of it.

    Yella turbo ZX7 Winner VCM Best Streetfighter and SOS encouragement award NFR 2011
    http://www.streetfighters.com.au/for...-s-ZX7-project

  9. #9
    Bloke with a smaller stick BANDITROD's Avatar
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    hahahahahahaha nice

    Glenn Eason drinks and smokes and lends his arse to other blokes

  10. #10
    Tyre destroying, mad bastard menace
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    i have always worked to 1 on the front is worth 3 on the rear so 2 up is 6 down on the rear really good if u want top speed runs on a salt lake or a turbo to push that gearing
    and have always been told on a 530 chain u dont want less than 15 on the front as chain has to small turn under that but have never ttested it

  11. #11
    Tyre destroying, mad bastard menace
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    The Tuono runs a 525, the 15t front I've been running seems to kill them about every 10,000ks.

    On the 1/8th I'm into 4th on the Tuono where on the gixer I was just clicking second.

    With the 15 / 42 setup I was having trouble keeping the front down so this was wrecking my 60', I'm wondering if a smoother launch with the 17t will possibly help my 60'. ??

    I've ordered a 16/42 520 to put on but I'll run the test and tune on Saturday with the 17/42 525 and see if it makes any difference, put the new chain on that night and run it on the Sunday and see what the difference is.

  12. #12
    ASF Standard Full Member Redmohawk's Avatar
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    I would think if your lifting the front heaps lowering the front with straps would be a better option (assuming the bike is road as well as track) if its already lowered and your still lifting and or breaking heaps of traction then taller gearing might be an option. Reducing gearchanges (running through traps in 3rd instead of 4th) might save you a few tenths especally if your backing off for gearchanges (instead of using a flatchange setup). Better to be going through the traps just maxing out in 3rd than clicking 4th 50 feet before them.

    If your swapping chain/sprockets look at a 520 chain the dirt squirters all swear 520 instead of 525 makes a load of difference to pickup and thats what your after.

  13. #13
    RevHead
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    the 15t front I've been running seems to kill them about every 10,000ks. I just put 20thou on my old 1100 and never Wore my sprockets out ,have you been over tightening your chain a little,or just to loose.
    i put a 530 chain and sprockets on my 1100 way back in 2009

  14. #14
    Bloke with a smaller stick BANDITROD's Avatar
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    prob due to more power pete

    Glenn Eason drinks and smokes and lends his arse to other blokes

  15. #15
    Tyre destroying, mad bastard menace
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    and a 525 will wear faster than a 530 as well.

  16. #16
    RevHead
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    well there you have it.
    its only got 139 hp at the crank.

  17. #17
    ASF Standard Full Member Redmohawk's Avatar
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    Everything is a trade off , smaller chain lighter sprockets will let you accellerate faster but you will get slightly faster wear. 520 chain and ali sprockets are often used on big bore/stroke 1000's making up over 200hp and last up to 10k so how much do you want to spend to go that little bit faster ?

  18. #18
    ASF Gold Full Member Yella's Avatar
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    I run 520 chain on everything even the turbo with out any hassle and most run -1 +2 as my prefered gearing. I have had no problem with chain and sprocket wear but I don't use mine as a everyday ride so I don't really worry about that either
    'Originally Posted by rock hard stock swingarms are for blokes with balls!! ha ha'



    I would love to become a professional whistler. I'm pretty amazing at it now, but I wanna get, like, even better. Make my living out of it.

    Yella turbo ZX7 Winner VCM Best Streetfighter and SOS encouragement award NFR 2011
    http://www.streetfighters.com.au/for...-s-ZX7-project

  19. #19
    RevHead
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    Quote Originally Posted by Redmohawk View Post
    Everything is a trade off , smaller chain lighter sprockets will let you accellerate faster but you will get slightly faster wear. 520 chain and ali sprockets are often used on big bore/stroke 1000's making up over 200hp and last up to 10k so how much do you want to spend to go that little bit faster ?
    true statement,on my dirt bikes alloy rear sprockets made all the diff,on the road i use and like the ever lasting 530 set up ,plus i rode my 1100 everyday as well,im riding the new bike everyday as well now ,what brand of chain lube do you guys use ,ive been using full synthetic chainsaw lube for years ,i get a little fling off but nothing to worry about

  20. #20
    Tyre destroying, mad bastard menace
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    Conclusion.......17/42 sucks arse, 1/2 second slower over 1/8th than 15/42. Simply not enough torque to go fast enough in 200mtrs. Put my new 16/42 520 setup on when I got home, I'll see what happens tomorrow.

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