slipping seatpost
#1
Member
Thread Starter
Join Date: Nov 2009
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
slipping seatpost
the seatpost on my super pista is slipping down as i ride. the seatpost is fine (thompson elite) i can find any problem with the frame, and the bolt tightens fine. does anyone know what would be causing this? the post is the right size this problem just started happening after about 500 miles
#2
Single-serving poster
Join Date: Aug 2009
Location: Toronto, Canada
Posts: 5,098
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Maybe the seatpost is crumpled a bit, is the clamp clamping? is the seat-tube still squeezing down as evidenced by the notch? It could be that you've worked it into an oblong shape instead of the circular shape if you rode with the seatpost above minimum insertion..
#3
Senior Member
Join Date: Sep 2009
Location: Up
Posts: 4,695
Bikes: Masi, Giant TCR, Eisentraut (retired), Jamis Aurora Elite, Zullo, Cannondale, 84 & 93 Stumpjumpers, Waterford, Tern D8, Bianchi, Gunner Roadie, Serotta, Serotta Duette, was gifted a Diamond Back
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 305 Post(s)
Liked 2,038 Times
in
604 Posts
I had a similar problem and it was the binder bolt.
#4
Senior Member
Join Date: Feb 2010
Location: Leeds, England
Posts: 138
Bikes: Meercat
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
u could drill a small hole in the seat-post, at the ideal hieght, and put a small pin/screw in it? Not tried this myself.
#5
Senior Member
Join Date: Sep 2007
Location: Vancouver
Posts: 1,437
Bikes: NOYB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Slipping posts are almost always due to them being the wrong size for the frame. The Bianchi Super Pista needs a 27.2, I believe. First thing you should do is verify that.
#6
Senior Member
Join Date: Sep 2004
Location: boston, ma
Posts: 2,896
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
somewhat common with thomson's. if using a qr clamp replace it with one that has a brass or bronze bushing instead of the nylon or go to a bolt on non qr collar
#7
Member
Thread Starter
Join Date: Nov 2009
Posts: 45
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
its the right size post, it was way below minimum insertion, not a quick release, ill check the binder bolt i guess, it still tightens down but i guess it could be loosening as i ride
#9
Senior Member
Yes, I was having the same problem with my Thomson, I wiped most of the grease off (and switched to a bolt-on collar) and it stopped slipping.
Thread
Thread Starter
Forum
Replies
Last Post
Hisamatsu
General Cycling Discussion
0
08-03-17 05:15 AM
echo victor
Classic & Vintage
67
05-07-16 11:43 AM