If you want to exchange aerobars and drop some serious weight on that, you should definitely check out the HaeroCarbon H.253 bar. Lightest set I have seen so far with 330g including extensions and pads.
What I also really love is skateboard griptape on the extensions and handlebars. It's light, it does not add much to the frontal surface of your bike, grip is fantastic and you can manicure your fingernails on the bike
. It is actually definitely not as bad as it sounds, give it a try.
Dropping the rear brake is for sure not a great idea, especially as it does not change a lot about aerodynamics mounted at the bottom bracket.
- check your cable routing and make sure that everything is out the wind (for sure not a huge benefit, but hey, it's free
- tape over any holes or edges you can see (not really sure about UCI-legality here...)
- get your arms as narrow as possible without restricting breathing (this is about position on the bike, but often overseen)
- wear a tight fitting outfit, no gloves, overshoes
- are aerobottles UCI-legal?
Those are small effects, but they add up.
The guys at tririg built a 12.9 lbs timetrial bike (http://www.tririg.com/articles.php?id=2 ... t_Tri_Bike
). Maybe you can snatch some ideas from them
Mine is 20 lbs/9kg aswell, but that includes a 50mm frontwheel, a disc in the back and a power2max powermeter with havyass aero-qrings (that alone is 1.2kg including pedals
). But I haven't focused on weight so far...