[extensive]

is it alright if i cut the seatpost? i need to lower it about 1/4". how many inches need to be in the frame? i didnt know where else to post so why not here? it will save a few grams, i suppose.

 

[nygeo]

The minimum seatpost length in the seat tube differs greatly depending on your weight, the quality of the frame (materials, thickness) and the type of frame geometry in your bike (namely the location of the seat tube/top tube junction). I would contact your bike manufacturer and ask them. They have data on such questions that would precicely answer your inquiry.

 

[DaFireMedic]

is it alright if i cut the seatpost? i need to lower it about 1/4". how many inches need to be in the frame? i didnt know where else to post so why not here? it will save a few grams, i suppose.

A rule of thumb is to leave no less than an inch below the top tube. But better yet, as nygeo said, contact the manufacturer. Also, there is almost certainly some other threads on the forums if you do a search. Theres bound to be more info for you.

 

[Big Bad Wolf]

An inch?? Wow, did you know that if you crack your frame by using too short a seatpost, the frame warranty is void? A friend of mine cracked his frame at the seatpost junction and when they saw the shortened seatpost going into it they said "sorry, no warranty"
I always leave at least 1/3 of the post in, making sure it is at least going past the toptube/seattube junction

 

[mward]

If you only need to lower it 1/4 inch then only cut 1/4 inch off of it. That way you've still got as much in the frame as possible. I assume this is some sort of interrupted seat tube design with a stopper to prevent you damaging your shock.

 

[Max]

3-4 inches should be fine with any frame.... but at least right up to the lower edge of the top tube / seat tube joint.