an Ultegra Seatpost offset query

[kohlboto]

I'm looking for a seatpost that has the same offset as my Ultegra SP-6600 post. Does anyone know what the offset (or setback) is on the Ultegra post? I seem to recall it was 21mm but I could possibly be wrong...more than likely, really.

[phcollard]

Jay I just measured on mine and it looks like it's 25mm...

[kohlboto]

merci beaucoup philippe...btw, how do you measure the offset...what points do you use?