My bike comes stock with this thing, which must be filled with lead:
http://www.fullspeedahead.com/products/ ... d-Seatpost" onclick="window.open(this.href);return false;

It seems like an easy target for weight savings, BUT I cannot seem to find anyone else who makes this shape topper in something carbon/alu. Thoughts? If no other toppers are available in this shape, are there part swaps I could do to lighten it up?

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Seven 622 SLX
Cannondale CAAD9
Merckx Premium (in progress)
Blue CXc

looks similar to one that fits on the Litespeed CR series. don't know of any replacements that are lighter.

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- AX Lightness Vial EVO D + DA9070 + Enve SES 3.4 Enve carbon hubs
- Parlee Altum + DA9070 + Enve 2.2 Enve carbon hubs
- Parlee ESX + DA9070 + Enve SES 4.5 CK hubs
- Independent Fabrication Ti FLW + Campy SR11 + Enve 3.4 CK hubs

Bummer. Seems at least 100g heavier than others on the market.

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Seven 622 SLX
Cannondale CAAD9
Merckx Premium (in progress)
Blue CXc