Seat Post DON'Ts
10-11-19 | 10:32 PM
#26
Ride, Wrench, Swap, Race
Joined: Jan 2010
Posts: 9,831
Likes: 1,809
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Not that I haven't seen enough broken Felt frames over the years (these are popular here where, Jim Felt lives), but flexible seatposts invariably concentrate stress more along the uppermost portion of the seat tube.
Even my bought-used but all-carbon Scott CR1 shows cracked paint along the seat tube extension, so I replaced the carbon post with a longer aluminum one.
The combination of a heavy rider (running their saddle well rearward) or mileage junkie, and a flexible carbon post perhaps raised to the limit, is something that I've seen take out a lot of frames.
Being long-legged means that most of my bikes have the seatpost raised to or near the limit, but since I'm light and favor a forward saddle position I have had no failed frames.
Even my bought-used but all-carbon Scott CR1 shows cracked paint along the seat tube extension, so I replaced the carbon post with a longer aluminum one.
The combination of a heavy rider (running their saddle well rearward) or mileage junkie, and a flexible carbon post perhaps raised to the limit, is something that I've seen take out a lot of frames.
Being long-legged means that most of my bikes have the seatpost raised to or near the limit, but since I'm light and favor a forward saddle position I have had no failed frames.
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