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  1. #1
    Bmx
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    hey,i've only been riding for 2 years and i want to get a smaller drivetrain on my bike,its pretty big and the size of the sprocket is a real pain in the ***.i'll tell you the truth i really never knew much about my bike it was just to get on it and to ride.Actually,i know a bit,just i don't know much about the drivetrain and sprocket.
    i never had problems with my sprocket and that but its really big.So what do i have to do,too upgrade this into a smaller drivetrain?And i'm not a noob,i just never really learn about how to fix/upgrade my bike,just got on it and started to ride......so now i'm takin my time to learn ,how to fix things and how to change stuff...

  2. #2
    Dig. KinetikBiker's Avatar
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    44-16, 41-15, 39-14, 36-13, 33-12, 30-11, 28-10, 25-9 and thanks to the new Primo Cassete 23-8

    those are the ratios...wohooo

  3. #3
    Bmx
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    My bike is currently 44-16,if i change the size would it change the "resistince" of pedaling?

  4. #4
    Bmx
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    wat do u think is the best one to go with?

  5. #5
    Senior Member Brian's Avatar
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    Do you have a freewheel, or a cassette hub? If you have a freewheel, you're limited as to how small you can go in back. By "Resistance", you're wanting to know if it gets any harder to pedal? You can keep the same ratio, or change it to suit your riding.

  6. #6
    Bmx
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    My Bike Has The following(i dont know much,at least im tryin)....:Sprocket 44t,Freewheel ACS Main Drive 16t,all i really wana do is to make the sprocket smaller since its so big,and i grind both ways,so it gets in the way,and yes it sounds weird.

  7. #7
    Senior Member sxe fbm rider's Avatar
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    If you have a flip flop hub you can run a smaller free-wheel.. I think the smallest one is a 13t so the smallest sprocket your going to be running with it is 36t. But I'm assuming you dont have a flip-flop hub so your best bet if you are real serious about it is to get a cassette hub..

  8. #8
    Bmx
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    So Wut Shood I Do? i dont want to pay "top dolla" either i juss wanna have a smaller sprocket the cheapiest way but i want it to last which is impossible but i'll look around once i no wat i need

  9. #9
    "Uh-uh. Respek Knuckles." hypersnazz's Avatar
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    You're pretty limited if you want to keep a similar gear ratio AND you don't have a f/f rear hub. Smallest you can go in the rear is 15 (and there's only ONE freewheel that will fit, the rest are for f/f hubs) which, unless you want to pedal super fast and go nowhere, limits you to about 39t in the front, no smaller. 36/15 would be an acceptable ratio for most riders, but you will be pedaling faster with less resistance than you are now.

  10. #10
    Bmx
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    what would be good....like i would love to have it nice and small but have good resistance so i wouldn't have to beat myself out just to hit a few jumps and that.i probaly consider getting a cassette hub...so this what im trying to say,i want a small sprocket,but i also want to have a bit of resistance so i wouldnt have to pedal twice as hard.whAt do you think is best?-ill get a hub..

  11. #11
    "Uh-uh. Respek Knuckles." hypersnazz's Avatar
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    39/15

  12. #12
    Bmx
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    is it small? and wood i have my resistance? any wood i need a cassette hub?

  13. #13
    Dig. KinetikBiker's Avatar
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    dont go lower then 30-11....its just not a good idea

    and for refference
    a flip-flop hub will get you either a- 44-16, 41-15,39-14 or 36-13
    Cassette hub will get you those and all the others....and cassettes are stronger
    THE SMALLER THE SPROCKET = Less life and more wear and tear

  14. #14
    Bmx
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    Smaller Sprockets Mean less Life?? and cood u make up your own? like example:39 12 ?

  15. #15
    Bmx
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  16. #16
    SPACE FOR RENT Jerry Garcia's Avatar
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    you can make up any ratio you want, ive rode with 39-16/39-14/39-13/39-12/30-12/30-11/. Ask your local bike shop to replace your freewheel in the back to a lower gear ratio. No need to buy a new sprocket.

    http://www.danscomp.com/cgi-bin/haze...IL&item=461003

  17. #17
    "Uh-uh. Respek Knuckles." hypersnazz's Avatar
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    BMX drivetrains rarely die of old age, they're more likely to die violently. Don't worry yourself over wear issues, you're not a roadie putting 1000mi/mo on his stuff. It'll last a good long time.

    If you want to figure out drive ratios, just put the massive processing power of your computer to the task of dividing the number of teeth in the front sprocket by the number of teeth in the rear. 44/16=2.75. This is a relative ratio, not absolute, but we don't care because you're not comparing bikes with different wheel sizes and crank arm lengths. So...the higher this relative ratio is, the HARDER it will be to pedal. 39/15=2.6, which is slightly smaller, but functionally very close. 39/12=3.25, very high. Generally you want to stay in between 2.0 (which is a very easy gear, pretty much only flatlanders use gearing this low) and 3.0 (very hard, almost too high to be really useful).

  18. #18
    Bmx
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    Yo Every1 What Did You Find Was Your best,BEST gearing??Right Now I Got 44-16 its a lil hard so i want to lower it,so i shood ask my bike shop to make the back a lil smaller like 15?wood this make it a lil easier to pedal and can i do this without purchasin a hub?? and thanks every1 for takin the time to help me understand this...

  19. #19
    "Uh-uh. Respek Knuckles." hypersnazz's Avatar
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    28/10 on the S&M (all-purpose screwing around bike), 25/11 on the Quamen (flatland bike with Nankai freecoaster).

  20. #20
    Senior Member sxe fbm rider's Avatar
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    If you want something really small you willl need to buy a new hub.. But you really dont need it.. I know plenty of people that grind both sides that dont have super small sprockets.

  21. #21
    Bmx
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    If I Get A Smaller DriveTrAin By Changing the Hub,My Resistance Would Change Right?39-14 or a 36-13 or 33-12. 33 -12 is about far as i'd go.

  22. #22
    Dig. KinetikBiker's Avatar
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    the ratios are all very close to 44-16...you probly wont notice it at all....


    unless your off the ratios then you will...

  23. #23
    JMC
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    be sensible JMC's Avatar
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    39-14
    bewahret einander vor herzeleid
    denn kurz ist die zeit die ihr beisammen seid
    denn wenn euch auch viele jahre vereinen
    einst werden sie wie minuten euch scheinen

  24. #24
    Bmx
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    JMC is 39-14 Have a Small Sprocket?

  25. #25
    Bmx
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    is 39-14 have a small sprocket? And Is It Pretty Much The Same Resistance? i wanna learn a good few things bout my bike so i could do upgrades...

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