Author Topic: Best way to straighten a seatpost? (Read 605 times)

oldschoolace · « **on:** May 08, 2013, 07:06 PM »

Got a 22.6mm fluted chromo seatpost with a slight kink about 20mm above the max height mark. Its only slight, a few degrees, but it will be noticeable when mounted.

I have had it in the vice with a long bar in the top and tried to ease it back but it wont have it. Dont want to go down the heat route or try and source another one so anyone got any suggestions besides a bigger bar to ease it back with?

Discostu · « **Reply #1 on:** May 08, 2013, 07:37 PM »

I would get a piece of wood. 2" by 2" around 4" long.

Then drill a hole down the middle the same size as your post.

Then saw the block in half down the hole. So you have two bits with half a hole. It will look like a curved channel down each one.

Next saw both of those blocks in half so you have four bits that are 2" long with a channel down each.

Discard one of the blocks.

Fit one block on the bent bit of the post with some tape. (With the post in the channel)

Then fit the other two the other side of the post. (Again with the post in the channel of each block) Leaving a gap between them, where the bend is, secure those with some tape.

Then stick it in the vice and tighten it up. It should straighten out.

But be aware it will be weak so it will probably bend again over time.

oldschoolace · « **Reply #2 on:** May 08, 2013, 08:02 PM »

Cheers

, tried something similar with oak so it wouldn't deform as much but had no luck.
Its almost as thought the angle of deflection is so slight that there isn't enough travel to affect any movement in the metal. If i lay it on a flat surface there is only around 2mm gap at the highest point of the bend.

I know its not a lot but i know its there. Its also just enough to jam in the seat tube

adenough · « **Reply #3 on:** May 08, 2013, 08:47 PM »

My mate from years ago (65 year old) fixed my GHP post with sand,springs and a mallet, twas bent in the usual place, cant beat an old tin basher, dont know how the process works so no use here, but it looked good, we shall see after a new layer of chrome??

oldschoolace · « **Reply #4 on:** May 09, 2013, 04:29 PM »

Meh!

Fixed it! for future reference a wooden block with the right sized hole in it to stop the tube deforming, held in a vice then bloody big length of 3x2 oak with a 22mm hole in one end. Huge lever, little work, jobs a goodun.

God bless Archimedes