how far into the bike frame does my seat post have to go? I'm about 80kg and the frame is ordinary steel.?

Answer 1

If there isn't a minimum insertion line stamped on the seatpost, you should keep about 4 inches - 100mm inside the seat tube. If the seat is too low after that, you'll need to go buy a longer seat post. 300mm seatposts are readily avialable.

Answer 2

You need to have the saddle at the right height. The first poster mentiones how to decide, which is good.

Also, both seatpost and frames have a minimum insert point. If you want to raise your saddle more, but you see that mark, then the frame's too small for you, and you'll actually risk breaking something.

Also, frames also have their minimum insertion distance. Some show it. As a rule of thumb, you should have the seatpost below the point where the top tube meets the seat tube.

If it's a full suspension bike with an interrupted seat post, be carefull that you don't pusht the seatpost down up to the level where the shock might touch the seatpost.

Answer 3

typically when you raise your seat post, you ought to leave about 5 cm of tube inside the frame,as to not snap the post nad have a tough time getting the broken half out.

Answer 4

As far as it needs to go to get you a proper seat height.

Your knee should be at approximately 30 degree angle at the bottom of your pedal stroke. Bottom equals in line with the seat tube.

Answer 5

There is usually a line scribed on the seatpost to indicate the minimum insert length.

Answer 6

There is a minimum insertion mark that you should look at. It should go below the top tube intersection.