FSA SL-240 Carbon Pro CSI seat post review£50.00

Tough & comfortable carbon/aluminium post

BikeRadar score4.5/5

This new 228g post sporting FSA's ‘Carbon Structural Integration’ technology has proved impressively comfortable, creak-free and durable on our hardtail testbed. It's even stood up to a proper beating through rock gardens and seated bouldery singletrack descents.

 Despite our general mistrust of single-bolt serrated cradle seat clamps, we’re pleased to say that the one used here – shared with the SL seat post – has been fine.

Carbon Structural Integration is FSA’s new technique of carbon ‘shrink wrapping’ alloy components using a high-pressure sock mould. 

By wrapping the carbon under high pressure, the fibre actually provides a genuine structural advantage rather than just a cosmetic finish. FSA claim that this not only improves basic strength, but also improves its shock-absorbing qualities and reduces the potentially brittle nature of either carbon or alloy alone.

This makes it a perfect construction technique for something that takes a lot of flex and impact loading, such as stems (OS-99), handlebars (XC-220) and this  seat post. 

The final bonus is that it’s also cheaper than a complete carbon shaft seat post, even though the performance is actually considerably better than many of them.

Guy Kesteven

Freelance Writer, UK
Guy started filling his brain with cycle stats and steaming up bike shop windows back in 1980. He worked the other side of those windows from '89 while getting a degree in “describing broken things covered in mud" (archaeology). Dug historical holes in the ground through the early '90s, then became a pro bike tester in '97. Guy has ridden thousands of bikes and even more components the world over since then and can remember them all in vivid, haunting detail. Can't remember where the car keys are, though.
  • Age: 44
  • Height: 180cm / 5' 11"
  • Weight: 68kg / 150lb
  • Waist: 76cm / 30in
  • Chest: 91cm / 36in
  • Discipline: Strict sadomasochist
  • Preferred Terrain: Technical off-piste singletrack and twisted back roads. Up, down, along — so long as it's faster tfhan the last time he did it he's happy.
  • Current Bikes: An ever changing herd of test machines from Tri bikes to fat bikes and everything in between.
  • Dream Bike: His Nicolai Helius AM custom tandem
  • Beer of Choice: Theakston's Old Peculier (not Peculiar)
  • Location: Yorkshire, UK
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