The Porter Cable 690LR is a mid-size fixed-base router for medium-duty work with a single-speed (27,500 rpm), 11 amp 1-3/4-hp motor designed along the same lines as its bigger stablemate, the 7518, although significantly lighter at 8 lbs. The Porter cable 690LR has become pretty much the production shop standard due to its excellent value for money and no frills, get the job done design.
The Porter Cable 7518 is a heavy-duty, five speed, 3-1/4 hp fixed base router designed to be primarily used in a router table, and has all of the important features that you need for heavy-duty router table work, such as a 1/2-inch collet, good range of depth adjustment and the motor unit is easy to remove from the base to enable quick and easy bit changes without skinning your knuckles.
The Porter Cable 892 Fixed-Base Router is Porter Cable’s entry in the mid-sized 2-hp to 2-1/4-hp router bracket. For all-round use, a mid-sized router can be the perfect compromise between the 3-hp behemoths and the new breed of smaller trim routers. They have enough power to cope with the majority of work, but without the bulk and weight of the larger routers than can be a handful to use freehand.