Seatpost Clamp
#1
Senior Member
Thread Starter
Join Date: Jul 2006
Posts: 177
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Seatpost Clamp
Hi. I have a 2007 trek 520 which uses a 27.2mm seatpost. I need to replace the seatpost clamp but it doesn't appear the measurements are based on the seatpost diameter but instead the seattube diameter. Is this correct? If so, anyone have any idea what size seatpost clamp I should be looking for?
#2
cab horn
Join Date: Jun 2004
Location: Toronto
Posts: 28,353
Bikes: 1987 Bianchi Campione
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Likes: 0
Liked 26 Times
in
19 Posts
Seatpost collar is independent of the seatpost size. Obviously the collar can't be smaller in diameter than the post.
#3
Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
Probably 31.8mm (1-1/4"). Measure the diameter of the seat tube (frame) where the seatpost enters.
#4
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
Seat post collars commonly come in three diameters 1-1/8" (28.6 mm), 1-1/4" (31.8 mm) and 1-3/8" (34.9 mm). Your bike most likely takes one of these.