Sprockets for BMX

[Streetr]

I'm going to gat a Profile Imperial sprocket and i was just wandering how many teeth i should get. I'm going to be dirt jumping if that helps

[taylor-91]

how many teeth do you have on your driver or freewheel do you have onn your rear wheel?, normally the most popular gearing is 13-36(which is 13teeth on the back and 36t on the sprocket)

[TIMOH]

36-16
25-9
30-11
etc
what rear do you have?

[Streetr]

I'm currently running 44 on the front and 16 on the freewheel

[taylor-91]

I'm currently running 44 on the front and 16 on the freewheel

The best thing to do would probably be to get a new freewheel with less teeth so that your sprocket isnt so big, odyssey make a 13t freewheel which means you could run 36t sprocket, and the gearing will still feel the same http://www.odysseybmx.com/catalog/index.php?image=7_13tfreewheel.jpg&list=Wheels&page=1

[Streetr]

This is the one i was thinking about. It comes in 36t or 44t. It is the profile Blackjack.


http://www.albes.com/index.asp?PageAction=VIEWPROD&ProdID=196

[bmx]

buy a 13t freewheel for the back, and a 36t sprocket. that'll make it pretty much as small as it will go, but with the correct gear ratio. but i think for trails and park, its easier to ride one gear down.

and if you were to get a 36, don't get snafu, they suck. the teeth eat themselves away. i had an odyssey utility 36t, was very good

[user name]

When buying a new freewheel of driver you must remember that youll need a flip-flop hub to put the smaller sprocked on, other wise your looking at a new hub/wheel as well:eek:

My advice is to stay with the original freewheel and only change the sprocket, its cheaper that way;) .

[x]

Depending on your budget, I would either:

1. Buy the 13t freewheel and a 36t sprocket

or if you have a lot of money:
2. Buy a whole wheel with a cassette hub, a chrome rim and a 10t driver, then get a 28t sprocket. (will be very expensive) However, you don't really need micro gearing for dirt jumping.

[Streetr]

Right now i'm only looking at the sprocket but may change the freewheel in the future. I wasn't really intending on buying a new freewheel or hub.

[x]

Right now i'm only looking at the sprocket but may change the freewheel in the future. I wasn't really intending on buying a new freewheel or hub.

You can't just change the freewheel in the future unless you get another new sprocket....

[Streetr]

This may seem stupid but why?

[TIMOH]

your ratio is going to be off.

[Jordy]

This may seem stupid but why?

He is wrong. old mate will be fine to run a small sprocket and change his freewheel to suit later on. but a 36-16 gearing will pedal rather easy for the time being.

[hubbie]

you won't fit a 13t on most hubs that came with a 16t. You'll need a flip flop hub to run a 13t, or a cassette hub to run as low as 12. I would suggest a new rear hub if you plan on getting a smaller sprocket, otherwise i wouldn't change sizes.

[Jordy]

you won't fit a 13t on most hubs that came with a 16t. You'll need a flip flop hub to run a 13t, or a cassette hub to run as low as 12. I would suggest a new rear hub if you plan on getting a smaller sprocket, otherwise i wouldn't change sizes.
ahhh yea
thats a good point. if ur planning on changing your freewheel make sure its a 1/2 inch hub instead of 3/4's or wateva the sizes are...if not. your stuck with a 16, I'd save cash and get a Tufneck style cassette hub which are fairly cheap.

[shmeado]

a cassette hub to run as low as 12.

I dont get it lewis? Cassette hubs can run 8t on the back.

[E-thugin]

^^^^^^^^^

depends what brand of hub....


is it 8 tooth now?? i thought it was only 9tooth?

[TIMOH]

theres a 6 Im fairly sure

[roasted]

8t is in production, 6t prototype.

I wouldnt go any smaller than nine. you're already pushing to get a 25t on your cranks. + The additional chain stresse would not be worth the (marginal) weight loss and (marginal) extra clearance.

[E-thugin]

with a six you would end up getting chain rub on ur chainstays... coz it would be to close i reckon... the only way to get a chainring on the crank to match the ratio would be to make a new crank set with the sprocket fixxing bolt closer to the b/b.. if u get what i mean:)


I still think its a load of shit about getting to much chain stress with smaller gearing..

[roasted]

There was a G-sport article on it, the stresse involved are ridiculous, Ill try and dig it up.

[melbourne rider]

36-16
25-9
30-11
etc
what rear do you have?

wrong!!!!!!!!!

25-9 = yes
30-11 = yes
36-16 WTF???????? its 44-16

so....
43/44 - 16
39 - 14
36 - 13
33 - 12
30 - 11
28 - 10
25 - 9
22/23 - 8

[E-thugin]

There was a G-sport article on it, the stresse involved are ridiculous, Ill try and dig it up.
..i still think 25-9 is as good & strong as anything. ive had no hassles with it for the past 2 years.

if you could find the article & post it up, that would be good.
im interested to to see...

with a 6 they would have to re-design the chain & cog with smaller links & teeth... a normal chain wouldnt bend nicely around a cog so small..

[hubbie]

I dont get it lewis? Cassette hubs can run 8t on the back.

I'm not talking 1pce drivers, i'm just talking regular cheaper cassette hubs.


Ultimately i'd use either a 30 or 28t sprocket (coupled with 10 or 11t driver) for the best compromise between strength and size

[TIMOH]

Sorry, wasnt thinking, 36-13.. 36-16 is way too easy to pedal, my mate ran it temporarily

[Streetr]

Do you think that i should get the 44t or get the 36t and get a new cassette hub?

[E-thugin]

if u have enough $$$ get a cassete hub.. u will probably need new spokes aswell if the hub flanges are different..

get what ever size u want, i reckon smaller sprockets look better..
if ya getting a new hub go for a 25

[taylor-91]

if you have the money for a cassette hub and sprocket go for that, the hub will work alot better than your previous one and give you bike a better look with the smaller gearing:D

[E-thugin]

oh i forgot to add..

i would NEVER use a freewheel on my bike... they break to easy & slip..

cassette hubs a generaly strong & reliable N easy to service

[MUGEN]

Do you think that i should get the 44t or get the 36t and get a new cassette hub?
if ur gonna get a cassette hub u might aswell go smaller simply because you can

[Streetr]

Any one know which cassette to get eg: oddesy. They've got to be under about $120 AUS.

[mike-]

There's been quite alot of talk in here about thr 13t freewheels that have just come out on the market.

And I say DON'T BUY THEM.

I have tryed the oddysse 13t freewheel, and I have also tryed a cheaper brand that was the exact same to the oddysse (I'm sure it was from the same factory). Anyway both of them shagged it in only a few weeks or riding.

I have never done it do a claws or even a dictor frwweheel, but these ones just strip.

Admitidly I race bmx and each time it happened was out the gate when you put alot of pressure on your sprockets and chain (and cranks, lol stripped a few of them aswell).

It may be ok for just a dirt jumper or street rider, but for racing I think I will have to go cassete to be safer.

PS. Yes it hurts when they strip... it's like you do half a crank then you chain falls off, in the perfect position to smack your knees on your head set, and balls on ya bars.

[Mr Sparkle]

..i still think 25-9 is as good & strong as anything. ive had no hassles with it for the past 2 years.

if you could find the article & post it up, that would be good.
im interested to to see...

with a 6 they would have to re-design the chain & cog with smaller links & teeth... a normal chain wouldnt bend nicely around a cog so small..

You would need to run a half link, so that the chain actually goes around the cog. Correct me if i'm wrong.

mark.