28mm Seatpost

Haydn1

I need to get a 28mm diameter seatpost for a carbon frame but I cant find any that size from my usual shops/websites. Any suggestions about where I can find them?

Alternatively it seems like getting a shim and using a 27.2mm seatpost might be an option. If I decide to do that is it a bad idea to use an aluminium shim with a carbon frame & seatpost?

Thanks!
Haydn

keezx

I know some older Colnago frames have this size and Colnago delivered it with a matching post.
Maybe E-bay....
If you need a shim, don't use an alloy one. (galvanic corrosion)
Buy stainless steel sheet of 0,4 mm

Haydn1

Yes the frame is a Colnago C40, I cant find any 28mm seatposts on ebay but will keep checking.
Presumably with the steel sheet id just have to cut it & roll it into a tube?
Thanks for the advice

arlowood

[quote="
If you need a shim, don't use an alloy one. (galvanic corrosion)
Buy stainless steel sheet of 0,4 mm[/quote]


Carbon frame and seatpost - I think you'll struggle to encounter galvanic corrosion with an aluminium shim. The shim itself might corrode but it wont bond to the carbon. S/S shim would obviously be better and won't cost the earth.

Monty Dog

Originals were made by WR Compositi, so maybe worth a search?

mrdsgs

i use a 27.2 campag record titanium stem with a proper shim, bought years ago, 27.2-28.0. they do exist. i have a 28mm aluminium seatpost, i think made by selcof, but it never looked right to me.