38:14, 32:20, 26:26 and 20:32 that is 4+4 not 4x4.
12 speed lateral spacing front and rear with room for wide tires (that is accepting a non-roadie Q factor) and no cross chaining. Basically 4 single speed set ups in parallel (and the front rings would not be as wide as old 3X, since you don't have to account for cross-chaining and rub on the next biggest ring)
Shimano front pull side swing type derailleurs front and rear for hard tail (and you could probably get away with only one pulley for the rear derailleur on a dual suspension bike).
Cable from the front derailleur would continue from the mounting bolt to the rear, so both derailleurs would be controlled with only one cable (or possibly a splitter but still only one shifter, and the springs of each derailleur would cancel each other out for lighter feel at the shifter).
This would be useful to me for Fromme rides, or bikepacking routes where there is a lot of lifting and/or strapping the bike to one's back for long portages (every gram counts, since I have been at my limit with a 24lb bike plus camping gear, food and water, and lighter drivetrain would equal a dropper post, warmer clothing, funner tires or a beer).
Could be ~150 gm for chain rings, ~150 gm for cheap rear cogs (without getting into crazy spider-like milling or carbon carriers), ~110 gm each derailleur and ~80 gm for a simple shifter with no clockworks (so still lighter than Eagle or XTR 1X, plus single speed efficiency and no dangling cages)
Oct. 25, 2019, 4:02 p.m. - taprider
38:14, 32:20, 26:26 and 20:32 that is 4+4 not 4x4. 12 speed lateral spacing front and rear with room for wide tires (that is accepting a non-roadie Q factor) and no cross chaining. Basically 4 single speed set ups in parallel (and the front rings would not be as wide as old 3X, since you don't have to account for cross-chaining and rub on the next biggest ring) Shimano front pull side swing type derailleurs front and rear for hard tail (and you could probably get away with only one pulley for the rear derailleur on a dual suspension bike). Cable from the front derailleur would continue from the mounting bolt to the rear, so both derailleurs would be controlled with only one cable (or possibly a splitter but still only one shifter, and the springs of each derailleur would cancel each other out for lighter feel at the shifter). This would be useful to me for Fromme rides, or bikepacking routes where there is a lot of lifting and/or strapping the bike to one's back for long portages (every gram counts, since I have been at my limit with a 24lb bike plus camping gear, food and water, and lighter drivetrain would equal a dropper post, warmer clothing, funner tires or a beer). Could be ~150 gm for chain rings, ~150 gm for cheap rear cogs (without getting into crazy spider-like milling or carbon carriers), ~110 gm each derailleur and ~80 gm for a simple shifter with no clockworks (so still lighter than Eagle or XTR 1X, plus single speed efficiency and no dangling cages)