Shimano Reel Spool

Shimano Reel Spool
What does a low mass drilled spool system mean?

I’m looking at the shimano calcutta 200gtb reel and don’t understand what they are referring to when they say the majority of a drilled spool system mass lies in the arbor and the line it is spooled with.

This has to do with rotational inertia. It is the same thing as an ice skater, when they pull their arms and legs in (toward the axis of rotation), their rate of spin increases. Since you want your line to go our easily and to stop going out when you want it to stop, minimizing the inertia of the rotating mass helps. By making the spool light weight and, in particular, making the rims of the spool light (so the heaviest part of the spool is close to the axle/spindle), then the rotational inertia of the spool is minimized. The line increases the rotational inertia because it weighs something and the more you put on, the further it gets from the axis and, therefore, increases rotational inertia of the system (spool + line). From a practical point of view, it is rather unlikely that your average fish exhibits a sophisticated appreciation for the rotational inertia of your reel.

Reel Maintenance – Line Lay, is your reel spooling your line on right?