I took the Comp Triple crank off the bike, removed the bottom bracket and TruVativ adapter, and weighed it all. I also reweighed the Ashtabula crank, bearings, and press-fit cups.
The crank is the 53-42-30t chainrings version with 170mm arms. The crank with the crankarm bolts weighs 790g.
The bottom bracket with fixed and adjustable cups weighs 230g.
The adapter (two threaded ends and three steel bolts) weighs 120g.
That's a total of 1140g (2.513 pounds).
The Ashtabula crank with bearings and cups weighs 1910g (4.211 pounds)
The difference is a significant ~1.7 pounds.
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- Stan
my bikes
Science doesn't care what you believe.