Factor Disc Project Part 4.

You can find the earlier parts of this project here:
Part 1
Part 2
Part 3

The Factor O2 disc project bike is done. (At least for now) and as far as we can tell it comes in as the worlds lightest road disc brake race bike, even though a worlds lightest was not our goal.  Finished weight is 5092 grams (11.2 pounds).   We obviously could have gone lighter.  For sake of argument we could do the same build using our prototype Myth cranks, Fibre light chainring, carbon rotors and Tufo tires (all of those pieces we have in hand here and have weighed the differences) it would save 328 grams bringing the total down to 4.76kgs and still a few grams additional could be shaved.  However since the goal was the lightest race worthy disc bike, we opted for the more robust pieces and landed at a sub 5.1kgs weight.  

Full build list below the gallery.