New rider confession: my butt hurts

[fooferdoggie]

The bike has a 28.6 mm seat tube and the OEM post is rock solid. The problem is, I use Redshift, Thudbuster and Kinekt suspension posts which are all 27.2 mm. They aren't available in 28.6 mm so I have to use a 27.2 to 28.6 shim. I've tried several but get the best result with this one from Cane Creek:

https://www.amazon.com/gp/product/B0011W2R6Q/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1&psc=1

It's a snug fit and there is no room to use the beer can trick. Part of the problem is the thickness of the aluminum seat tube. it's almost twice as thick as any of my other aluminum frame bikes and requires quite a bit of clamp force.

The dual clamp idea works fine though so problem solved.

ok ya I see whats happening. the combo of the two is causing issue.

 

[PedalUma]

Back to the B-17 Brooks. Lanolin on the underside does wonders.

 

[fooferdoggie]

one thing you could use is the locktite for bearings on the seat post and shim so that does not rotate then your clamp is only having to hold one part in place.