Seat post too big?
#1
Senior Member
Thread Starter
Join Date: Apr 2006
Location: Aurora, CO
Posts: 1,306
Bikes: CAAD9-1, Windsor Cliff 29er
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Seat post too big?
I just made another post in which I mentioned my wife borrowed a bike and I'd like to fix it up before returning it. One problem she had was the seatpost slipped down while riding. It's probably my fault, it's a carbon post and I was worried about over-tightening it. I did notice, however, that the post was VERY hard to move up and down. I loosened the bolt on the collar all the way but I'm having a very hard time removing the post just to take it to a bike shop to get the nicks checked out. I've never dealt with a carbon post (aluminum frame, Tirrenno Razzo 3.0) but I wonder if it should be that tight? It looks like it's leaving lots of tiny scratches as I try to remove the post. Is it possible it's too small for the frame just by a little bit? Obviously it can somewhat work, but I wonder if that was part of the problem. Most of the grip just comes from it being in the frame so I thought it was tightened enough.
#2
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 38,716
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 140 Post(s)
Tagged: 1 Thread(s)
Quoted: 5787 Post(s)
Liked 2,580 Times
in
1,430 Posts
If the post can slide in to the seat tube beyond the the slotted first 1-2 inches is is definitely not too big. The next size won't fit at all, and the next one smaller would be sloppy ,and possibly couldn't be tightened. the scratches are probably from burs and rough edges created when they milled the slot in seat lug or clamping area. They can be filed out with a triangular or half round file to keep from adding more scratches.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
#3
Senior Member
Thread Starter
Join Date: Apr 2006
Location: Aurora, CO
Posts: 1,306
Bikes: CAAD9-1, Windsor Cliff 29er
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
If the post can slide in to the seat tube beyond the the slotted first 1-2 inches is is definitely not too big. The next size won't fit at all, and the next one smaller would be sloppy ,and possibly couldn't be tightened. the scratches are probably from burs and rough edges created when they milled the slot in seat lug or clamping area. They can be filed out with a triangular or half round file to keep from adding more scratches.
Thread
Thread Starter
Forum
Replies
Last Post
fredrok
Bicycle Mechanics
13
05-29-14 04:55 PM