I have a 2015 Salsa Colossal with a 44mm head tube. The upper cup is a ZS44/28.6 (1 1/8") and the lower cup is EC44/33 (1 1/4"). I need to punch out the cups, so I bought a Park Tool RT-1. It states that it works with 1" to 1 1/4" cups and Park's website explicitly says it works with ZS44 and EC44 cups. The problem is that the flared part of the tool passes right through the lower 1 1/4" cup and barely catches the upper 1 1/8" cup. I could direct the tool at one side and then the other, but I thought the main purpose of the tool is apply pressure evenly around the cup. Should I have bought the bigger RT-2?
The park tool RT-1 is the original headset cup removal tool for 1 1/8" headset cups.
The RT-2 oversized headset removal tool is the correct tool for 1 1/4 and larger cup sizes.
That said, the RT-1 can be used, when directed carefully, on 1 1/4" cups also.
In my opinion, Park is too liberal in stating what larger headset sizes the RT-1 can work with, but it isn't technically wrong.
Recently manufactured RT-1 tools have more flare to the ends than the older RT-1 did, which may account for the difference as well.
Depending on when and where you bought yours, you may have the pre-1 1/4" version. Either because it's new/old stock, or because it was used...