My Trek to an Iron Man

I am 6’5″ tall and I need a hire seat post.  I am changing the standard seat post to a 27.2 mm / 400 post.  I have long legs and need the extra size.  The problem is that with the bike I have I can break the frame if I extend the seat post too far up.  If it is too far up it will act like a lever and bend the top frame apart.  So for 36.00 I got a new seat post and here is how to install it.

Loosen the bolt that holds the seat post.

Press it back with you thumb or get a pair of plyers.

Turn the seat over and loosen the attachment bolts with and allen wrench.  There maybe be one or two bolts.  Loosen them both.

Top is the old seat post, bottom is the new.  Notice the bottom is about 3 inches longer and has a different seat attachment piece.

Loosen both bolts on the new post until they are just about to fall out.  On this seat post, one bolt had a slot that would allow it to swing out.

Place the new seat post on the seat rails.  Then swing the bolt back into position.

Align the seat post in the middle of the seat bars.  Later you can adjust the seat forward or backwards.  Tighten the screws with an allen wrench.

Notice on the post there will be a line that indicates that this is the highest the post is allowed outside the frame.   Don’t extend the frame any higher than this line or the frame will break.  Now go and ride the back and test to see where the best height for the seat is.

!!NOTE !!  You may need to rotate the seat post 180.  If the seat feels like it is jamming your but, detach and rotate.  This happened on mine and once I rotated, it felt 100 times better.

Once you are satistified with the ride height.  Use a sharpee to put a mark on the post.  It may lower after general use.

The new seat post for a 6’5″ tall rider.  Since I am saving up to buy a bigger bike, this will work for the mean time.  Happy riding and hope this helps. !!