Research ultralight backpacking. Those whackos have been perfecting their techniques for decades; everything's been thought of for you.
On a bike, though, you can reduce your mass only to a certain point and then safety becomes an issue. You need some spare parts and hefty tools that a through-hiker wouldn't think of carrying.
Additionally, you've got to a wee bit of math. Your total mass––you, bike, water, food, gear, clothing, tools, spares, everything--must be objectively measured before you begin going ultralight. Say your total moving mass at the moment is 250 pounds. Whittling away a whopping 10 pounds is a mere 4% reduction in your total mass! (240/250=96/100)
Those ten pounds don't gain you anything you can feel in your legs although, yes, there are more complex physics applications that will indicate every Newton saved in mass is a reduction in effort required to overcome gravity.
Now, lose thirty pounds? Maybe. (220/250=88/100 or 12%) But that kind of mass reduction means you will need a year to carefully create your new, lighter engine.
david boise ID