30.8mm post in a 30.9mm hole...

[RDH]

Firstly - that's what she said.

Secondly - My new HT frame as a 30.9 seat tube diameter and I recently purchased a cheap-as-sh!t 30.8mm seat-post from CRC and am wondering if I am risking damage to the frame by using it given that, technically, it is the wrong size. I find i hard to believe that 0.1mm is going to make a different but would still like some learned advice/opinions. Anyway, thoughts?

 

[tidlibit]

it will be fine, your frame has a slot in it to compress right? .1 for that kind of dia tube isint going to let it move much down lower in the seattube, unless you only have like 2 or 3 inches in the frame, even then most of witch would be clamped anyway.

 

[kalem]

I think it'll be fine mate, use your judgement when you install it. I'd imaging the tolerance's in manufacturing a cheap as shit post wouldn't even be 0.1mm so maybe it will be the right size anyway..

 

[ChopSticks]

it will be perfectly fine mate !

 

[FoxRidersCo]

Tighten the seatclamp to buggery however if there is still some movement, cut a small strip of aluminium drink can and bend it into a circular shape insert it into the seat tube and that should give you that extra 0.1mm between the post and the seat tube.

Also known as the coke can shim...

 

[Zyphryss]

My 27.2mm posts slips down in my 27.3mm frame, just used a Coke can shim and she's sweet!

 

[brendonj]

You can buy my 30.9 seat post that I bought, only to find out my bike needed a 30.8 Not after much