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Correct torque amount for carbon railed seat?

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Correct torque amount for carbon railed seat?

Old 12-10-17, 03:14 PM
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Correct torque amount for carbon railed seat?

Hi, I have a Toupe with carbon rails, and it's on my Cobble Gobbler seat post (2018 Roubaix). The bike came with another heavier and less comfortable seat, so I swapped it. However, I only had a torque wrench (Ritchey) that goes to 5Nm. Doesn't seem to be enough, as the seat rotates and I have to adjust it again periodically. Not good on a ride. I don't want to over tighten it, and destroy the rails. Just ordered a Park Tool Torque wrench, but don't know the correct amount I should set it at. Any help? : )
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Old 12-10-17, 06:45 PM
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Originally Posted by Apexhunter
Hi, I have a Toupe with carbon rails, and it's on my Cobble Gobbler seat post (2018 Roubaix). The bike came with another heavier and less comfortable seat, so I swapped it. However, I only had a torque wrench (Ritchey) that goes to 5Nm. Doesn't seem to be enough, as the seat rotates and I have to adjust it again periodically. Not good on a ride. I don't want to over tighten it, and destroy the rails. Just ordered a Park Tool Torque wrench, but don't know the correct amount I should set it at. Any help? : )
Is this the correct reference document?
https://media.specialized.com/suppor...0000044211.pdf
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Old 12-10-17, 07:15 PM
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I had a Ritchey seatpost that used two wedges against a curved aluminum surface to adjust the tilt. It slipped on my first ride when I hit a big bump.

I fixed it by roughening the curved surface and the wedges with 240 sandpaper, and using carbon assembly paste -- a gel with plastic grit in it. That improved the friction a lot, and the saddle stopped slipping.

So, maybe you can do something similar with the wedge clamp? I don't know how your wedges work, though.
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Old 12-10-17, 07:56 PM
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Originally Posted by Apexhunter
Hi, I have a Toupe with carbon rails, and it's on my Cobble Gobbler seat post (2018 Roubaix). The bike came with another heavier and less comfortable seat, so I swapped it. However, I only had a torque wrench (Ritchey) that goes to 5Nm. Doesn't seem to be enough, as the seat rotates and I have to adjust it again periodically. Not good on a ride. I don't want to over tighten it, and destroy the rails. Just ordered a Park Tool Torque wrench, but don't know the correct amount I should set it at. Any help? : )
Mine is a different brand but it calls out 10Nm
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Old 12-10-17, 10:56 PM
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Thanks Sy, that was very helpful. Seems like it has to be torqued to 13nm to keep it from slipping.
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Old 12-11-17, 07:26 AM
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Originally Posted by Apexhunter
Thanks Sy, that was very helpful. Seems like it has to be torqued to 13nm to keep it from slipping.
Theoretically. However, this chart tells you nothing about what your saddle's rails can withstand. From warranty standpoint, you'd probably be OK since your saddle is also Spesh.
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Old 12-11-17, 11:49 AM
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IME, Specialized single-bolt clamp needs to be

brutally tight to not slip, especially if the saddle is to the rear.

My carbon saddle rails have survived this.
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