i need to fix the gearing on the bike im putting together cause im getting a 25t chainring am i looking for a freewheel? or just cog? and what are the sizing issues? 
thanks in advance
thanks in advance
Freewheels?
- Thread starter Randomshot
- Start date
sorry...im building a ss dj bike. i need to change my gear ratio right now it will be looking around 40.6 i hear u want it as close to 55 with my new sprocket ill need a 12 tooth cog, can i just get a new cog or will i need a new freewheel? never dealt with this before
thanks
thanks
Last edited:
the smallest you can get in a thread on cog is a 13t to my knowledge. To go to a 12, you'll need what's called a driver hub. Might want to post in the dj/bmx forum for this question, but I'm pretty certain you'll need to be rebuilding your wheel around a 12t driver hub.
On a standard track hub you can mount a 12t fixed (no freewheel) cog. If you want a SS freewheel, you either need to move up to 13t, or use a special hub to accommodate 12t.
I know you've got your heart set on a small chainring, but going to a larger chainring will give you more freedom to achieve whatever gearing you need, and will also pay off in better chain and sprocket life. I suggest you consider a 28/14, 30/14, or 32/15 combination which give close to what you want while using common parts.
it depends on the hub you have, as mentioned above.
do you have a ss hub? or a 9 speed hub?
there are 11t and 12t cogs for 9 speed hubs.
a quick google search shows that there are 12t ss cogs. i see both thread-on and cassette style ones.
do you have a ss hub? or a 9 speed hub?
there are 11t and 12t cogs for 9 speed hubs.
a quick google search shows that there are 12t ss cogs. i see both thread-on and cassette style ones.