Safe to run a shim on a LONG dropper seatpost?

[Blind]

so I need a longer seatpost for my mtb, the 330mm I have now is just too short (I'm 6'5", 36" pant leg).

My SC Bullit uses a 28.6 size post, and the only dropper posts I can find are the x-fusion hilo (350mm at full extension) and the gravity dropper (400mm at full extension), I'm leaning heavily towards the gravity dropper because of the extra length and the preset drop (1" or 2" choice). Both are 27.2 post size and require a shim to 28.6.

My concern is does that shim create a weak spot that could fatigue while riding? I stand up going down aggressive stuff but I pedal several miles to get to my downs...

[006_007]

Shimz are fine.

[derby]

Cane Creek makes very nice shims. The shim needs to be at least 4 inches long, or the same or longer than minimum post insert depth recommended by the frame or post manufacturers.

The only problems using a shim are the seat post can slip down easier while riding and more chance for creaks. Clean everything to prevent creaks, and carbon-fiber assembly paste, such as Finish-Line "Fiber Grip" paste, can be used instead of grease to help reduce the post slip while riding without having to over torque the seat collar's pinch bolt.

[theMeat]

^ from someone who knows ^

the only thing I'd add is the added stress to the frame.

[ElwoodT]

Shimz are fine.

even from 27.2 all the way to 31.6?

[mimi1885]

Cane Creek makes very nice shims. The shim needs to be at least 4 inches long, or the same or longer than minimum post insert depth recommended by the frame or post manufacturers.

The only problems using a shim are the seat post can slip down easier while riding and more chance for creaks. Clean everything to prevent creaks, and carbon-fiber assembly paste, such as Finish-Line "Fiber Grip" paste, can be used instead of grease to help reduce the post slip while riding without having to over torque the seat collar's pinch bolt.

Yep, I also like the Gravity Dropper shims, they have the shim for most seat post sizes. I talked to Rick at KS, he said some companies do not allow the use of shim as it may void the warranty.

[eurospek]

Cane Creek makes very nice shims. The shim needs to be at least 4 inches long, or the same or longer than minimum post insert depth recommended by the frame or post manufacturers.

The only problems using a shim are the seat post can slip down easier while riding and more chance for creaks. Clean everything to prevent creaks, and carbon-fiber assembly paste, such as Finish-Line "Fiber Grip" paste, can be used instead of grease to help reduce the post slip while riding without having to over torque the seat collar's pinch bolt.

I found that my Reverb post slipped and creaked a ton with the Finish Line carbon paste than with good ol' Red Devil Grease. I followed the Reverb installation to the tee, where they recommended carbon paste and light closing of the seat collar. With that, it was creaking non-stop. Plus slipped quite a bit since the collar wasn't too tight. Took me a while to track this down finally after half season of riding like this. I'll save carbon paste for actual carbon material.