Originally Posted by
cruisintx
uhhhhhhhhhhhhhhhhhhh -- I have no idea what all that means; bcd? 'Square taper BB? TA? STI? "preset throws expects early chain pickup" **********??!!
I'm not a racer nor do I plan to be at age 56; I'm just shooting for a little more low end torque to climb hills without having to spend half the cost of the bike.
Don't worry, BCD is the diameter the bolts that hold the chainrings on. Your crank is a 130mm BCD for the big and middle chainring and 74mm for the small chainring. Most road triples are standardized on these dimensions.
Square taper is the interface between the crank arm and the housed axle that is held on the bike frame. This housed axle is called a Bottom Bracket, or BB for short.