's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

seatpost sizing...(5 posts)

seatpost sizing...Frith
Jul 21, 2003 10:51 AM
I have a marinoni frame that was made in the late 80's (my estimation) by an italian builder in Canada. I got it on ebay and the seller listed the seatpost diameter as 27.2. I'm having a hard time squeezing a 27.2 in there though. What other sizing standards are there and is it likely that my bike is not in fact 27.2....
Some other factors:
The frame doesn't have a seat post collar yet and I notice that the very top is a little tighter than further down. Could it be that I just need to spread the top out a bit with a screw driver or something...
I have been able to force the seatpost about 1/2 cm in before chickening out if this was not 27.2 would it even go in that far? should I just slap a bit of grease on and give it a bit of force?
According to Sheldon Brown it's 27.2 from 1980 - present nmDave Hickey
Jul 21, 2003 11:11 AM
Take it to a shopMR_GRUMPY
Jul 21, 2003 11:24 AM
Most shops that are worth their grease have a seatpost sizer that can measure seat tube ID's.
re: seatpost sizing...Spoke Wrench
Jul 21, 2003 11:24 AM
I suspect that the top of your seat tube has been squished in a little. I think that I'd try an automotive battery terminal tool to try to open it back up. It looks kind of like a backward pair of pliers with rounded jaws that open up when you squeeze.

Force fitting a seat post into it seems a little medieval and is likely to result in a bunch of little back and forth scratches in your seatpost.
you were right...Frith
Jul 21, 2003 1:27 PM
I put some electrical tape on the end of a flat head screwdriver and used it to pry open the top of the seat tube. That did the trick.