New: Take part in the January 2020 BikeRide Giveaway for a HEDKAYSE | ONE bike helmet

Welcome guest! Register or sign in to participate in the cycling discussions.


Seat Tube machining
#1
A bike I'm working on has a seat tube that is extremely tight for a post. I used a vice and ruined the previous post that was inside it.

I plan on using a hone to smooth out the ID of the tube and slightly enlarge it. It'll be a challenge putting a bike frame to this machine. Does anyone have any alternatives to reworking the ID of a seat tube that are maybe hand fixes?
  Reply
#2
Are you sure you have the correct seat post diameter? I have been a bike mechanic for a long time and have only used a reamer for corrosion build up. Go to a bike shop and get the post and seat tube matched.
  Reply
#3
(09-12-2011, 03:44 PM)ghost Wrote:  Are you sure you have the correct seat post diameter? I have been a bike mechanic for a long time and have only used a reamer for corrosion build up. Go to a bike shop and get the post and seat tube matched.

The post and tube match. I will look into a reamer. I work in a machine shop where we do not use reamers too much and a hone provides a smoother finish. Downside is it is a fixed spindle machine.
  Reply
#4
it will be much easier to reduce the size of the seat tube!!! especially if it is alloy, you can do it just by rubbing down by hand with sandpaper.
but I ditto Ghost.
  Reply
#5
depending on the size of the seat tube one can match a seat tube shim and a smaller seatpost to suit your needs. many bikes come stock with seat tube spacers and they come in a variety of sizes.
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
  Reply
#6
I like "ghost's" suggestion as well. Machining, sanding, or altering a seat tube in any way can be dangerous. It would tend to weaken the seat tube possibly resulting in bodily injury.

Steve
Junkyard Tools rescued from the junkyard!
  Reply
#7
Thanks for all the replies. After all the messing around I found a post to match the tube.
  Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  Re-seat steerer tube into forks RockyRoader 2 4,391 08-05-2016, 01:01 AM
Last Post: RockyRoader
  How to fix your tight seat tube by honing (video) Painkiller 2 7,689 10-30-2014, 11:11 PM
Last Post: Painkiller
  The Derailleur is touching the seat tube but i still cannot shift to the bottom ring Dagwood121 2 4,880 07-23-2011, 02:09 AM
Last Post: Dagwood121
  7" steerer tube into 5" head tube. 2011softcruise 3 5,114 07-13-2011, 03:31 PM
Last Post: DaveM
  Seat post stuck in seat tube danr2013 1 10,358 08-30-2010, 01:48 AM
Last Post: Bill
  Front mech for curved seat tube. nic elf 1 4,907 05-01-2010, 04:38 PM
Last Post: Bill
  Seat tube cable stop dr1445 3 9,192 01-04-2010, 11:40 AM
Last Post: Joe_W
  Tube fit solution - and some tube replacement questions jdohe 6 10,460 10-29-2009, 06:45 AM
Last Post: Joe_W

Forum Jump: