S/O to my friend and fellow bass guide, Gregg Kizewski, for tying up some of the best hair products for bass
The 1750, 1750A, 2600 and 2650 were the free spool models of seven total for this series of reels

Features 9 stainless steel ball bearings + 1 roller bearing provides smooth operation A-Symmetric Carbon Frame and Rotor provides a lightweight and compact platform AMG 2 gearing system provides precision machined gears for unparalled smoothness and durability V-Rotor system allows for a more compact, weight reducing rotor design and provides ultra-low start up inertia V-Spool Design for a more compact, lighter weight spool Carbon Matrix drag system provides smooth, consistent drag pressure across the entire drag range Rocket Line Management system provides better control of all types of fishing lines Rocket Spool Lip Design allows better control of line coming off the spool Machined aluminum braid ready spool allows braid to be tied directly to the spool without any slip Tubular Carbon Fiber handle with soft touch handle knob 30 Ton graphite blank for a lightweight balanced design Abu Garcia custom soft touch reel seats for superior comfort High density EVA gives greater sensitivity and durability Specs Rod Power: Medium Rod Length: 7' Line Rating: 6-12 lb

Throw them on points, bluff walls, rocky banks or anywhere that bass are suspended or feeding up in the water column
Another difference is the Centrifugal brake...this one sports three brake blocks...where the smaller models only have two