Gearing Help??

[FL-R]

I have 13/39 and for the track it worked perfect.
well i bought some 20s to run XC and i want just alittle more down low, cant quite pull 6th.

Heres the question, do they make a 40t rear, ive seen a 12t front but im wondering if it will drag the chain slider being so small and im not going to take a link out of the chain for the 12t if its to long. Thanks.

[RyanWsly]

most people think 13/39 is too low. I personally run that because I always have, 13/38 is very common for a woods bike with 20" rears. You might look elsewhere to see why it won't pull 6th gear, because with that gearing it should very easily.