Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  

Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Thread Tools Search this Thread
Old 11-10-10, 09:43 PM   #1
Thread Starter
Join Date: Oct 2010
Posts: 4
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What Size Seat Clamp?

I just got a frame fitted for a 27.2 seatpost. I have never had a bike that has to have a seat clamp added to its frame before,

MY QUESTION IS... do i need a seat clamp that is also sized 27.2, or since the clamp is going on the frame does it need to be larger
fixedkicks is offline   Reply With Quote
Old 11-10-10, 10:34 PM   #2
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
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
Posts: 35,069
Mentioned: 101 Post(s)
Tagged: 1 Thread(s)
Quoted: 3450 Post(s)
Seat post clamps are sized by the outside diameter of the frame's seat tube, not the seat post which is the size of of the inside diameter. They are often sold in metric sizes, but these are actually rounded off equivalents of standard inch sizes, either 1-1/8", 1-1/4", or 1-3/8" (approx 28..6, 31.8, or 35mm).

If the seat post is 27.2, odds are the seat tube is 1-1/8" if steel or 1-1/4 if aluminum or carbon, but you'd best either measure or check the spec sheet to be sure.
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“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.

Last edited by FBinNY; 11-10-10 at 10:37 PM.
FBinNY is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -6. The time now is 04:36 AM.

  • Ask a Question
    get answers from real people!
Click to start entering your question.