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
Mentioned: 2 Post(s)
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This is a perfect example of why I hate a paint by numbers approach to mechanics using torque specs. There's no way a seat post maker can specify a torque spec. A post maker might specify maximum clamping compression, but even that depends on how perfect the fit is, and how round the tube.
Then there's the issue that clamping force depends on the construction of the clamp and the thread of the clamping bolt, so unless the seat post maker is psychic and knows what clamp you're using he can't have any idea of a torque spec.
Use carbon assembly paste and tighten the clamp enough to hold so the saddle doesn't twist or slip when you ride, staying below the 5nm of the clamps spec. Also remove the clamp and grease between the clamp and frame, then install with the slot not aligned with the slot in the seat tube. That allows the clamp and seat tube to support each other across the slots to keep the tube round which greatly reduces local stress on the post.
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
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