Hammered in seatpost or not?
 

Hi All!

I have recently found an old roadbike, which I am converting to fixed. However, when I took the bike apart the seatpost was really stuck... I got it out and some corrosion was on the post. I got a new one same size but longer, and it will only go in so far - so far being about the length of the old seatpost.

Could the old one have been hammered in? I cannot feel any difference on the down tube (no "bulkyness"), and when I put light in there and look down onto it, the only thing I see is some corrosion and a straight tube... Is it normal for the seatpost to stop somewhere down the tube? And last but not least should I just shorten my new seatpost, and use it?

Thanks in advance
Morten

on the seat tube of the frame is there a place a cage ( for a water bottle ) ? if there is the bolt for the cage may keep the post from going all the way in.yes you could shorten the new post. the seat tube could go narrowing near the bb without seeing it.

Have you tried greasing the seatpost?

I was having an issue getting a seatpost in more than an inch or two, and it was the right size seatpost, but a handful of lithium grease solved the problem pretty nicely.

Might there be more corrosion below the bottom point of old seatpost, thus preventing the new seatpost from go any lower?

I'd maybe grease up the old seatpost and wiggle it around as low as it will go to help clean out and lube the seattube. Then lube up the new one and see if it fits any better.

Cutting the new seatpost would work to, although it might be a last resort.

Cutting the seatpost to give your max possible height for your leg length and the min insertion distance is the preferred way as it will save some grams.

I had trouble with a tight seatpost(but correct size) in a new frame and took it to a shop - they reamed out the seat tube with a special reaming brush on a cordless drill and some cutting compound. The whole process took about 5 minutes. maybe they could do something similar to clean out your old seat tube.

That was a hone that they used, not a reamer. A good honing is likely just what the OP needs.

We just covered this in the SSFG forum. Stop crossposting.