Pick your rack pulley, cable tower or functional trainer to see the racks its maker lists, the exclusions, the mount, the rating with its scope and the connector at the cable end.
One brand can make mounts with different rules. Rogue's Monster Slinger fits Monster Rack 2.0 models, while the Monster Lite Slinger fits only Monster Lite racks, and Titan says its T-3/X-3 lat tower does not fit Flat Foot racks. Identify your exact rack, then check the pulley maker's list.
Adding ratings together
A load rating belongs to one product and sometimes one pairing. Fringe Sport's 200 lb applies only when its pulley is paired with its Gibbon Arms, and GymPin says a stronger pin does not raise a machine's rating.
Guessing the selector pin size
Stack adders come in 8 mm and 10 mm versions, and makers change pin sizes across models and years. Measure the pin already in your machine, and never fit an 8 mm pin into a 10 mm hole.
Reading the stack number on a 2:1 machine
On a 2:1 machine, REP explains, 20 lb of stack feels like 10 lb, and the stack moves half as far as the cable. Compare machines by the ratio the maker lists, not the stack number alone.
We start from the exact pulley, tower or trainer you own. Fit, ratings and sizes come from the makers' own product pages and manuals, and every value is labeled with its source; where no maker states a field, we say it is not confirmed. A rating is shown with the scope its maker gives and is never moved to another part. We list an attachment only with an exact brand and model and a published spec. A store's name alone does not show that the brand authorized it. Nothing here has been tested by us.
