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Carbon Seatpost for a 350lb Rider?

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Old 05-17-18, 09:25 PM
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DarKris
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Carbon Seatpost for a 350lb Rider?

So I found my perfect bike - Giant Toughroad SLR GX 1, put a down-payment on it, and then I found out it has a carbon seatpost....

Again I like everything about the bike from the components to the handling and the massive tire clearance. The only issue is with the carbon seatpost, which is Giant's proprietary D-Fuse post. The step down has the alloy post, however I would much rather prefer the GX 1 model for the drivetrain and frame color. My LBS said that Giant don't sell the post separate so I contacted Giant and they said to have the shop contact the warranty department to see if they have a replacement aluminum D-Fuse post.

The bike is on 90 day layaway, but it IS on layaway which might lead to some issues if I have to cancel it just because of the seatpost. I am a 350-360lb rider so I am pushing the limits of most bikes at this point.

Am I rightfully concerned or am I being paranoid?
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Old 05-18-18, 08:53 AM
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I'd be paranoid, too. I've had to make a "call of shame" when my aluminum seatpost folded backward and broke off; fortunately I was going slow enough to hop off. You might take the approach that Giant will replace the carbon seatpost if (when?) it breaks. A bigger question is whether the entire bike can support you, if they're shaving grams by putting in a carbon post.
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Old 05-18-18, 10:55 AM
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I beleive member @dagray has been using a carbon seatpost for a while.
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Old 05-18-18, 05:54 PM
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My Orbea Orca has a carbon post, I have been riding it from 396 pounds down to 350 pounds and back to 360 pounds.... over the last three and a half years. No issues what so ever.

I also upgraded the 105 groupset to 11 speed Ultegra, upgraded the bars to 35mm diameter carbon bars, and upgraded the wheels to Rolf Prima "Vigor RS" (OEM) wheels.

Now if I could find more time to ride.
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Old 05-18-18, 09:49 PM
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I'd get the bike plus have them order an alum post

https://bicyclewarehouse.com/product...nt=41676421514


if standard diameter, I'd trust a Thomson more then a OEM
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Old 05-18-18, 09:57 PM
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Originally Posted by jsigone View Post
I'd get the bike plus have them order an alum post

https://bicyclewarehouse.com/product...nt=41676421514


if standard diameter, I'd trust a Thomson more then a OEM
The seatpost that you linked is the carbon model, the same on my Toughroad. The Seat-clamp is aluminum.

I would have to either get lucky and find one or have my LBS contact their warranty department and see if they have any aluminum D-Fuse posts.
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Old 05-18-18, 09:59 PM
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The $60 COMP one? seems alum to me
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Old 05-18-18, 10:13 PM
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Originally Posted by jsigone View Post
The $60 COMP one? seems alum to me
Yup. Quoting the item description: “A replacement D-Fuse seatposts for equipped Giant bikes.

The proprietary “D” shaped composite seatpost dampens vibration—resulting in a smooth, compliant ride. Available in both SL and Comp grade carbon.”
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Old 05-19-18, 10:55 AM
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I think it could work. I am 280-290 so I'm a bit lighter but I have 1,200 miles on a Felt cross bike which has an OEM carbon seat post with one clamp. No problems at all - even after a minor crash where the seat did a 90-degree turn (ouch!). I rarely even have to adjust the seat back up.
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