Originally Posted by
gsa103
Heaviest components are typically
1) Wheels
2) Crank
3) Cassette
4) Everything else
If you're getting crank flex, upgrading to 105/Ultegra is potentially a good way to lose a few grams and eliminate any FD rub.
Yep. Upgrade in this order. But I would say first buy a digital kitchen scale.
In lieu of cassette there's more bang for buck with Chinese carbon saddle and post. Check the tires as well