Running Seatpost Shims Long Term

peter413

This is technically for my road bike as I've got a spare 27.2 I Beam post I want to run in my 30.0 road bike but I've been running one in my Rocky for ages and did in my Marin for a while as well. I've heard people say that this can damage the frame if you run them long term. Is this true? I'm no lightweight at just over 100kg so I suppose I would be putting more stress through the frame. Don't really want to have to fork out for two new seatposts, they aren't that cheap any more.

nicklouse

makes no difference and can be prefferental in some situations.

peter413

Awesome, exactly what I wanted to hear

Chunkers1980

Ran one for years with my old USE post, never had a problem.

Cycling is Forever

Chunkers1980 wrote:

Ran one for years with my old USE post, never had a problem.

Ditto
prob 10yrs plus plastic shim aluminium frame no worries

njee20

Unless it's really short (like some Post Moderne ones were) in which case you may not have enough to cover the seat tube/top tube junction.

YeehaaMcgee

nicklouse wrote:

makes no difference and can be prefferental in some situations.

Out of interest, in what situations can it be preferential?

Chunkers1980

Me too. Can't think of a situation where a tight tube in tube full length is not better... Mmmmm

peter413

Maybe if you have a dropper post, like a Gravity Dropper in 27.2 but you have a larger seat tube.

njee20

Why would that be beneficial?

Must admit the only thing I can think is that it's marginally less likely to seize than a correctly sized post.

peter413

It would mean you could run your expensive dropper post on a different frame, that's a benefit although not in a structural sense.

nicklouse

YeehaaMcgee wrote:

nicklouse wrote:

makes no difference and can be prefferental in some situations.

Out of interest, in what situations can it be preferential?

Carbon posts.
And protecting the Finnish on a post.
More overlap does not actually help anything. It just gives more surface area to bond together.

YeehaaMcgee

nicklouse wrote:

YeehaaMcgee wrote:

nicklouse wrote:

makes no difference and can be prefferental in some situations.

Out of interest, in what situations can it be preferential?

Carbon posts.
And protecting the Finnish on a post.
More overlap does not actually help anything. It just gives more surface area to bond together.

Why would I want any Finnish people on my seatpost? Do they offer a performance advantage?
Will they pedal for me when I'm knackered?
And, more importantly, if I do employ some Finns to help me get through the Coed y Brenin enduro in a few months, will it be classed as cheating?

nicklouse

Did you not know that their language has a great effect on the surface of any material exposed to it.

Go listen to some Lordi with some headphones on.